• Metamaterials'2025
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1 September 2025 / Start time: 8 h 0 min
08:00 - 09:00 - Registration
09:00 - 09:30 - Opening Ceremony
09:30 - 10:30 - Plenary Session I
09:30 - Plenary Session I

Session chairperson(s): Femius Koenderink

09:30 - 10:30 - Bio-Inspired Self-Assembled Chiral Architecture for Optics and Plasmonics Plenary [Show abstract]
  • Silvia Vignolini, University of Cambridge, UK
Chirality transfer across length scales is an intriguing and universal phenomenon. Both in nature and for application complex architectures composed of bio-based chiral building blocks are responsible for unique optical responses from colorations to extremely high g-factors. When it comes to working with naturally derived chiral building blocks, however, the challenge lies in understanding how the properties of individual building blocks relate to the emergent features of large-scale architectures and structures. Our research addresses this gap by investigating the origins of mesophase chirality in bio-derived particles such as cellulose and chitin nanocrystal suspensions. Through a combination of quantitative morphological analysis of individual nanoparticles, final architecture, and their assemblies we showcase the functionality of such chiral materials in the context of optical materials including plasmonic ones, also providing examples of how such materials can be produced at scale.
10:30 - 11:00 - Coffee Break (Monday Morning)
11:00 - 12:30 - Oral Sessions (Monday Morning)
11:00 - Metasurfaces for Antenna Systems I

Session chairperson(s): Alessio Monti; Antonio Clemente

11:00 - 11:30 - Fully Reconfigurable, Scanning, and Multifunctional Metasurfaces Invited oral [Show abstract]
  • Sergei Tretyakov, Aalto University, Finland
  • Viktar Asadchy, Aalto University, Finland
<p> In this presentation we will discuss our recent research on antenna arrays and metasurfaces formed by aperiodic arrangements of electrically small meta-atoms. The overall objective is to find means for creation of thin layers with an arbitrary engineered response. For example, realize layers that work as all-angle absorbers or leaky-wave antennas or layers that exhibit a desired distribution of near fields in their vicinity. Furthermore, we target arrays that can be configured and reconfigured for various functionalities by changing bulk components (variable capacitors, for example) in their meta-atoms. In contrast to periodical metasurfaces that require different periods for different functionalities, the introduced solutions allow full reconfigurability in geometrically fixed platforms. We will discuss fundamental limitations on the performance of conventional reflectarrays and show how they can be overcome by using arrays with subwavelength geometrical periods. Importantly, we will present solutions that can exhibit even superdirective properties at all scan angles. For example, in the absorbing regime these panels can absorb more power than is incident on their surfaces.</p>
11:30 - 11:45 - Controlling the Mode Profile, Dispersion, and End-Fire Radiation in Parallel-Plate Waveguides with Metasurface Boundaries Oral [Show abstract]
  • Odysseas Tsilipakos, National Hellenic Research Foundation, Greece
  • Thomas Koschny, Ames National Laboratory, USA
We study parallel-plate waveguides formed by metasurface boundaries, which are both electrically and magnetically polarizable and exhibit temporal and spatial dispersion. We find novel opportunities for controlling the mode profile and propagation constant. We also show that an asymmetric profile can tilt the radiation from the open waveguide end.
11:45 - 12:00 - A Low-Power Smart Millimeter-Wave Beamforming System for Base Station Application Based on Programmable Metasurfaces Oral [Show abstract]
  • Jun Wei Zhang, Southeast University, China
  • Qiang Cheng, Southeast University,
A low-cost, low-power, intelligent millimeter-wave base station based on programmable metasurfaces is proposed. The front-end configuration of the base station includes a disc-cone antenna feed, an ultra-large-scale 2-bit phase modulation metasurface, and a control board with 1,800 output ports. Based on this core architecture, we construct an intelligent millimeter-wave base station capable of wide-angle beamforming in free space while ensuring simultaneous transmission of data streams in the desired direction. Compared to traditional millimeter-wave base stations, the average operating power of this novel system is approximately 12 W, significantly reducing the design cost and power consumption of beamforming millimeter-wave base stations. This advancement provides strong motivation for the development of next-generation intelligent 6G base stations.
12:00 - 12:30 - A Comparison of Bode-Fano and Dispersive Tuning of Antennas Invited oral [Show abstract]
  • Arthur Yaghjian, Electromagnetics Research, USA
The derivation and comparison of Bode-Fano and dispersive tuning will be presented.
11:00 - Physics of Complex EM Media I

Session chairperson(s): Alejandro Rodriguez; Emanuele Galiffi

11:00 - 11:30 - Increased Sensitivity Based on Exceptional Point Degeneracies in Nonlinear Coupled Oscillators Invited oral [Show abstract]
  • Benjamin Bradshaw, University of California, Irvine, USA
  • Amin Hakimi, University of California, Irvine, USA
  • Filippo Capolino, University of California, Irvine, USA
Coupled oscillator systems tend to synchronize and oscillate at the same frequency, depending on their individual system's characteristics. The oscillation frequency of the system changes more rapidly when the oscillator's characteristics are varied over the exceptional degenerate solutions to the system's eigenfrequency problem. Introducing nonlinearities in systems with exceptional point degeneracy (EPD) makes the system more complex, but steady-state analysis can reveal the resonant frequency. Applying this analysis to a coupled oscillator system with a nonlinear gain element near the EPD shows that the system's sensitivity to parameters can vary quadratically or cubically, depending on the parameter.
11:30 - 11:45 - Octupole Topological Insulating Phase In Brillouin Three-dimensional Real Projective Space Oral [Show abstract]
  • Sichang Qiu, Southeast University, China
  • Shuo Liu, Southeast University, China
  • Ce Shang, Chinese Academy of Sciences, China
  • Lei Zhang, Southeast University, China
We propose and experimentally verify an octupole topological insulator in three-dimensional real projective space (RP3) using topological circuits. Corner-localized impedance peaks serve as its signature. Our findings extend the topological framework beyond toroidal Brillouin zones and offer fresh insights into band theory on non-toroidal manifolds.
11:45 - 12:00 - First-Principles Nanocircuit Model of Open Electromagnetic Resonators Oral [Show abstract]
  • Carlo Forestiere, University of Naples Federico II, Italy
  • Emanuele Corsaro, Department of Electrical Engineering and Information Technology, Universit`a degli Studi di Napoli Federico II, via Claudio 21, Napoli, 80125, Italy, Italy
  • Giovanni Miano, Department of Electrical Engineering and Information Technology, Universit`a degli Studi di Napoli Federico II, via Claudio 21, Napoli, 80125, Italy, Italy
  • Andrea Alù, dvanced Science Research Center, City University of New York, New York, New York 10031, U.S.A., USA
We derive from first principles a general circuit model representation for open, frequency dispersive electromagnetic resonators in the full-wave regime. This model extends the concepts of input and radiation impedance to scattering modes induced in open resonators by an arbitrary external excitation. We validate the model by reproducing Mie scattering phenomena using an equivalent analog circuit
12:00 - 12:15 - Probing Tellegen response by fast electrons Oral [Show abstract]
  • Eduardo Barredo -Alamilla, ITMO University, Russia
  • Maxim A. Gorlach, ITMO University, Russia
<p> Recent studies suggest that the Tellegen (axion) response in photonics and condensed matter systems arises from either orbital or spin contributions—two fundamentally distinct mechanisms, distinguishable only in the presence of sources. Here, we propose a Cherenkov radiation method as a novel probe of these contributions, revealing that while the total radiated power remains nearly identical, the emitted polarization differs significantly. These findings offer a direct method to probe the microscopic structure of Tellegen materials, offering new possibilities for testing new material responses.</p>
12:15 - 12:30 - Equivalent Dipolar Moment Array Representations of PTD-Symmetric Screens Oral [Show abstract]
  • Roee Geva, Tel Aviv University, Israel
  • Mário Silveirinha, University of Lisbon, Portugal
  • Raphael Kastner, Tel Aviv University, Israel
The polarization inversion property of PTD - symmetric systems is linked to an equivalent representations of the system by general polarizability parameters of dipole arrays. These problem-dependent representations allow for homogeneous models that can replace complex PTD structures while preserving their polarization characteristics. your abstract here
11:00 - Advanced Computational and Deep Learning Approaches in Nanophotonics

Session chairperson(s): Ekaterina Shamonina; Philipp del Hougne

11:00 - 11:30 - A Deep Learning Framework for Prediction and Inverse Design of Nanoscale Optical Forces near Gradient Metasurfaces Invited oral [Show abstract]
  • Ponthea Zahraii, Chapman University, USA
  • Saman Kashanchi, Chapman University, USA
  • Nooshin M. Estakhri, Chapman University, USA
  • Nasim Mohammadi Estakhri, Chapman University, USA
Traditional optical tweezers use a focused laser beam to trap and manipulate nano- and micro-scale objects, subject to diffraction limit. For accurate nanoscale optical trapping and manipulation, localized sub-diffractive light management is essential. Here, we propose a dielectric gradient metasurface configuration as a rich platform for creating tailored optical forces with sub-diffractive features. We focus on accurate modeling and inverse design of optical forces in the vicinity of this multi-parameter metasurface, demonstrating the power of data-driven-based approaches for analysis and design of analogous configurations.
11:30 - 11:45 - Gradient-based Optimization Of Scatterer Arrangements Using T-matrix Approach Oral [Show abstract]
  • Nigar Asadova, Karlsruhe Institute of Technology, Germany
  • Renaud Vallée, Centre de Recherche Paul Pascal, France
  • Carsten Rockstuhl, Karlsruhe Institute of Technology, Germany
This work presents a gradient-based optimization framework for nanophotonic design within the T-matrix formalism. Spheres serve as building blocks, enabling semi-analytical computation. Automatic differentiation allows for optimization over geometric and positional parameters in finite and infinite arrangements. Applying the method to a cluster and a metasurface demonstrates its suitability for inverse design.
11:45 - 12:00 - Informed Deep Learning for Electromagnetic Scattering Using Quasinormal Modes Oral [Show abstract]
  • Viktor Aadland Lilja, Chalmers University of Technology, Sweden
  • Albin Jonasson Svärdsby, Chalmers University of Technology, Sweden
  • Timo Gahlmann, Chalmers University of Technology, Sweden
  • Philippe Tassin, Chalmers University of Technology, Sweden
We present a neural network for electromagnetic scattering with a built-in quasinormal-mode expansion of the scattering matrix. Our approach significantly reduces the required amount of training data compared to standard neural networks by utilizing prior knowledge about the governing physics.
12:00 - 12:15 - Modal analysis for nanophotonic systems with branch cuts Oral [Show abstract]
  • Fridtjof Betz, Zuse Institute Berlin, Germany
  • Felix Binkowski, Zuse Institute Berlin, Germany
  • Jan David Fischbach, Zuse Institute Berlin, Germany
  • Nick Feldman, AMOLF, The Netherlands
  • Lin Zschiedrich, JCMwave, Germany
  • Carsten Rockstuhl, KIT, Germany
  • A. Femius Koenderink, AMOLF, The Netherlands
  • Sven Burger, Zuse Institute Berlin, Germany
The scattering response of periodic structures often contains pronounced features resulting from the interplay of resonances and square-root-type singularities at scattering thresholds where diffraction orders appear or vanish. These scattering thresholds correspond to branch points where different Riemann sheets of a multi-valued function meet. We demonstrate that resonances from different Riemann sheets influence the real frequency response in the vicinity of branch points, uncovering hidden resonances. The presented theory contributes to the physical understanding of metamaterials, sensing devices, and other classes of photonic systems, and enables efficient design of improved functionalities in upcoming technologies.
Media link(s):

See arXiv preprint arXiv:2503.03549, https://dx.doi.org/10.48550/arXiv.2503.03549

12:15 - 12:30 - Dielectric Waveguide Networks For Computing The Solutions To Dirichlet Boundary Value Problems Oral [Show abstract]
  • Ross Glyn Macdonald, Newcastle University, United Kingdom
  • Victor Pacheco-Peña, Newcastle University, United Kingdom
Networks of dielectric waveguides and wave splitters are exploited to produce approximate solutions to partial differential equations (PDEs) in the form of the Helmholtz equation. This is done via an analogy between the behavior of the networks and that of a regularly spaced finite difference grid.
11:00 - Nonlinear, non-Hermitian and Topological Acoustics

Session chairperson(s): Marc Martí Sabaté; Baile Zhang

11:00 - 11:15 - Nonlinear Scattering at an Array of Self-Excited Meta-Atoms Oral [Show abstract]
  • Alexander K. Stoychev, ETH Zurich, Switzerland
  • Ulrich Kuhl, ETH Zurich; Université Côte d’Azur, Switzerland; France
  • Nicolas Noiray, ETH Zurich, Switzerland
This work examines nonlinear scattering in an array of limit cycle oscillators. A model combining a conservative resonator and a saturable gain is used to describe the basic coupled mode dynamics in the weak coupling limit and the results for a single meta-atom are shown to be consistent with experimental data. Furthermore, the derived amplitude dispersion gives a preliminary view of how radiation losses interact with self‐excitation in an infinite array.
11:15 - 11:30 - Non-Hermitian Topology in Acoustic Su-Schrieffer-Heeger Chains Oral [Show abstract]
  • Tong Guo, Institut Jean Lamour, Université de Lorraine, France
  • Badreddine Assouar, Institut Jean Lamour, Université de Lorraine, France
  • Brice Vincent, Institut Jean Lamour, Université de Lorraine, France
  • Aurélien Merkel, Institut Jean Lamour, Université de Lorraine, France
In this work, we delve into the consequences of non-Hermiticity on the acoustic wave propagation in analog SSH lattices. The Hermiticity of the model is broken by either onsite losses or phase nonreciprocal couplings. Different types of interface states, topological phase transitions and the non-Hermitian skin effect are investigated.
11:30 - 11:45 - Long-range coupling induced multiple topological off-site corner states in sonic crystals Oral [Show abstract]
  • Wei Xiong, Nanjing University, China
  • Zhiwang Zhang, Nanjing University, China
  • Houyou Long, Nanjing University, China
  • Haixiao Zhang, Nanjing University, China
  • Ying Cheng, Nanjing University, China
  • Xiaojun Liu, Nanjing University, China
This study focuses on breaking frequency degeneracy constraints of corner states in higher-order topological sonic crystals by introducing long-range couplings. The proposed strategy creates generates an array of unconventional corner-localized states, each with distinct off-site localization positions. Experimental validation of these theoretical predictions is conducted using fabricated sonic crystals.
11:45 - 12:00 - Towards Realization Of A Compact Lossless Acoustic Circulator Based On Synchronization Oral [Show abstract]
  • Xinxin GUO, ETH Zürich, CAPS laboratory, Switzerland
  • Kuhl Ulrich, Université Côte d’Azur, CNRS, Institut de Physique de Nice (INPHYNI), France
  • Nicolas Noiray, ETH Zürich, CAPS laboratory, Switzerland
Current realization of acoustic circulators has often been plagued by their bulky dimensions and unavoidable inherent losses. Here we show a compact 3D-printed design of a self-oscillating acoustic cavity that has great potential to achieve lossless nonreciprocal transmission based on a synchronization mechanism. In the absence of external excitation, we generate self-sustained spinning acoustic modes by injecting swirling airflow into the cavity. An acoustic Zeeman effect is experimentally observed. The control over the flow rate allows the spinning to be adjusted in clockwise and counterclockwise directions, respectively. We then introduce an external acoustic source allowing to control the spinning direction of the mode. Our results hold great promise for the future development of networks of nonlinear acoustic circulators.
12:00 - 12:15 - Amplitude Modulated Wave Scattering on a Nonlinear Whistle Oral [Show abstract]
  • Zhenwei Xu, ETH Zurich, Switzerland
  • Ulrich Kuhl, Université Côte d'Azur - CNRS, France
  • Nicolas Noiray, ETH Zurich, Switzerland
This work explores synchronization-based acoustic cloaking under amplitude-modulated incident wave. We derive a relation showing how the limit cycle oscillator suppresses the input modulation, and validate experimentally by scattering acoustic waves on a 3D-printed whistle embedded in a 1D waveguide.
12:15 - 12:30 - Minimum-phase reflection for passive acoustic absorbers with target absorption spectrum and minimum volume Oral [Show abstract]
  • Yang Meng, CNRS, UMR 6613 - LAUM, France
  • Hao Dong, CNRS, CNRS 8006 - PIMM, France
  • Éric Ballestero, CNRS, UMR 6613 - LAUM, France
  • Simon Félix, CNRS, UMR 6613 - LAUM, France
  • Gwénaël Gabard, CNRS, UMR 6613 - LAUM, France
  • Jean-Philippe Groby, CNRS, UMR 6613 - LAUM, France
This work shows that, among the possible designs of a 1D system achieving a target absorption spectrum, the one with minimum-phase reflection displays the minimum total volume, making this design optimal for practical use. Minimum-phase reflection implies that all the zeros and poles of the reflection coefficient lie in the same half complex-frequency plane. Based on the magnitude-phase relationship satisfied by a minimum-phase system, a design strategy is proposed to develop passive acoustic absorbers that achieve the theoretical minimum volume for a given target absorption spectrum.
11:00 - Metamaterials for Thermal Radiation

Session chairperson(s): Andrea Alu; Mark Brongersma

11:00 - 11:30 - Photonic Strategies for Enhanced Heat Management and Performance in Photovoltaics Invited oral [Show abstract]
  • Maria Kafesaki, FORTH and University of Crete, Greece
  • Anna Tasolamprou, FORTH and University of Athens, Greece
  • George Perrakis, FORTH, Greece
We present our recent research on solar cell passive radiative cooling and other photonic cooling approaches, leading lower temperatures and improved efficiency in different photovoltaic devices, including silicon, organic and perovskite solar cells.
11:30 - 12:00 - Advanced Materials for Photonics under Extreme Conditions Invited oral [Show abstract]
  • Marina Leite, UC Davis, USA
Optical materials that can withstand high temperature environments have been recently sought after for applications ranging from thermophotovoltaics (TPV) to color filters. Yet, the limited material options used to date in these applications substantially restrict the temperature to which they can be exposed, or constraint overall device performance (e.g. far from ideal spectral control). In this talk I will present our recent progress towards identifying and testing materials that are suitable for high-temperature photonics.
12:00 - 12:30 - Kirchhoff’s laws of thermal radiation for complex, nonreciprocal, and time-varying materials Invited oral [Show abstract]
  • Sander Mann, University of Amsterdam, Netherlands
  • Dimitrios Sounas, Wayne State University, USA
  • Mingze He, CUNY ASRC, USA
  • Andrea Alù, CUNY ASRC, USA
Absorption and emission of thermal radiation can be manipulated in novel and unintuitive ways in advanced metamaterial environments. We present fundamental relationships between the emission and absorption in complex, nonreciprocal, and time-varying materials, and discuss resulting fundamental bounds.
12:30 - 14:00 - Lunch break and Poster Session I (Monday)
12:30 - Poster session I

Session chairperson(s): Masha Ogienko

1 - Protein Detection Based on Infrared Metamaterial Absorber Inducing Strong Coupling Poster [Show abstract]
  • Joo-Yun Jung, Korea Institute of Machinery and Materials, Korea (South)
  • Do Hyun Kang, Korea Institute of Machinery and Materials, Korea (South)
  • Doo-Sun Choi, Korea Institute of Machinery and Materials, Korea (South)
  • Taewon Park, University of Ulsan, Korea (South)
  • YeonKyeong Park, University of Ulsan, Korea (South)
  • Eun-chae Jeon, University of Ulsan, Korea (South)
A mid-infrared label-free immunoassay biosensor utilizing surface-enhanced infrared absorption spectroscopy enables sensitive biomolecule detection. This study developed a biosensor with a metamaterial absorber to achieve strong coupling effects. Maximizing coupling requires enhancing near-field intensity and ensuring spatial and spectral overlap between the optical cavity resonance and the analyte’s vibrational mode. Conventional baseline correction fails due to significant peak splitting. Thus, a coupled harmonic oscillation model was used to analyze spectral distortion caused by strong coupling-induced peak splitting. tract here
2 - Hyperband Multi-functional Metadevice based on Double-walled Carbon Nanotubes Poster [Show abstract]
  • Jin Zhang, Aalto University, Finland
  • Zhipei Sun, Aalto University, Finland
In the past decade, metasurfaces have become a paradigm for engineering electromagnetic space due to their strong interaction with light or wave. However, mastering the cross- wavelength modulation of spatial light over the entire electromagnetic spectrum remains a challenging task. Here, we experimentally demonstrate an avenue towards hyperband multifunctionality in a single metadevice based on double-walled carbon nanotubes (DWCNTs). As a proof of concept, the proposed DWCNT-based metadevice integrates three typical functionalities including microwave selectivity, terahertz diffusion, and optical transparency.
Media link(s):

 

3 - Chiral Optical Forces In A Slot Waveguide For Separating [6]-Helicenes Enantiomers Poster [Show abstract]
  • Josep Martinez-Romeu, Universitat Politecnica Valencia, Spain
  • Daniel Arenas-Ortega, Universitat Politecnica Valencia, Spain
  • Iago Diez, Universitat Politecnica Valencia, Spain
  • Alejandro Martínez, Universitat Politecnica Valencia, Spain
Chiral optical forces present an exciting avenue to separate enantiomers using light, which could be exploited in numerous industries. In this work, we calculate the chiral optical forces exerted by light guided in a dielectric slot waveguide in air and study the possible separation of hexa-helicene in air.
4 - Asymmetric optical responses and polarization rotation via optimized metamaterials Poster [Show abstract]
  • Emese Tóth, University of Szeged, Hungary
  • Olivér Fekete, University of Szeged, Hungary
  • Dávid Takács, University of Szeged, Hungary
  • Miklós Waldhauser, University of Szeged, Hungary
  • Dániel Megyeri, University of Szeged, Hungary
  • Dávid Vass, University of Szeged, Hungary
  • András Szenes, University of Szeged, Hungary
  • Balázs Bánhelyi, University of Szeged, Hungary
  • Mária Csete, University of Szeged, Hungary
Tri-layer metamaterial constructed with Babinet complementary miniarray patterns in convex-concave-convex succession was optimized to maximize asymmetric optical responses and accompanying polarization rotation. Better meeting of the generalized Faraday criterion was achieved via optimized configuration exhibiting more predominantly Tellegen coupling than playing with the artificial moving characteristic, compared to a dual counterpart configuration.
5 - Electrostatic Field-Driven Cation Effects in Electrocatalytic CO2 Reduction: Insights from *CO Adsorption Configurations Analysis Poster [Show abstract]
  • Dexiang Chen, southeast university, China
  • Dexiang Chen, southeast university, China
This work employs a plasmonic Cu nanoarray with controlled curvature to regulate local K+ concentration, stabilizing *COb and lowering the C-C coupling barrier. In situ SERS and DFT calculations reveal charge redistribution at the Cu-K+-*CO interface, enhancing C2+ selectivity in CO2RR.
6 - Enhancement of the spontaneous emission rate in extreme hybrid nanophotonic cavities. Poster [Show abstract]
  • Themistoklis Deloudis, University of Birmingham, United Kingdom
  • Angus Crookes, University of Birmingham, United Kingdom
  • Angela Demetriadou, University of Birmingham, United Kingdom
Optical nanocavities constitute environments that enhance the spontaneous decay rate of emitters placed inside them. Nonetheless, the intrinsic disadvantages that stem from the material of the cavity prevent the emission rate from reaching ultra high values. Recently, high finesse hybrid structures have been proposed to overcome these restrictions. However, the majority of these cavities operate at telecommunication wavelengths. In our work, we design a hybrid nanocavity with dielectric and plasmonic parts, which yields a four fold enhancement of the spontaneous emission decay rate compared with its isolated constituents while operating in the optical spectrum. Furthermore, the size and shape of our hybrid nanocavity are such that a quantum network is easily formable by fabricating a sequence of these cavities that spans a large distance.
7 - Integrated Subwavelength Bimodal Interferometer via Multilayer Hyperbolic Metamaterials Poster [Show abstract]
  • Luis Manuel Máñez-Espina, Universitat Politècnica de València, Spain
  • Alejandro Martínez, Universitat Politècnica de València, Spain
Bimodal interferometry in photonic integrated waveguides relies on structures supporting at least two modes to connect input and output channels. We present an ultrashort bimodal interferometer integrated into a photonic waveguide by embedding a multilayer hyperbolic metamaterial within a subwavelength gap between two dielectric waveguides.
Media link(s):

A complete version of the manuscript can be found in Optics Letters (https://doi.org/10.1364/OL.535004).

 

 

8 - Hybrid High-Index Composite Meta-structures with Atomic Layer-Coated Nanoparticle-Embedded Resin Poster [Show abstract]
  • Minseok Choi, Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea, Korea (South)
  • Hyunjung Kang, Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea, Korea (South)
  • Dohyun Kang, Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea, Korea (South)
  • Junsuk Rho, Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea, Korea (South)
<p> We introduce a hybrid nanoparticle-embedded resin (nano-PER) structure that reduces meta-atom height and aspect ratio. By utilizing TiO2 nano-PER as the core material with thin TiO2 coatings, we can implement the optical properties of high refractive index with printable material, achieving height and aspect ratio reduction.</p>
9 - Cost-effective and scalable manufacturing of meta-hologram using ArF scanner and Nanoimprint lithography Poster [Show abstract]
  • Chanwoong Park, Korea university, Korea (South)
  • Seungyoen Lee, Korea university, Korea (South)
  • Hansang Sung, Korea university, Korea (South)
  • Heon Lee, Korea university, Korea (South)
Metasurface, which is designed by arranging Meta-atom, has recently been in the spotlight for creating optical properties that do not exist in nature. However, in the past, meta-surface was manufactured using e-beam lithography, which was expensive and limited due to low production. In this study, argon fluoride imersion scanner and nanoimprint were used to overcome the limitations of producing a meta-surface using EBL. In the case of the hologram made of the existing EBL, the size of the pattern is a micrometer scale, but it was designed and manufactured on a millimeter scale. Imprinting using an 8-inch master stamp produced 266 millimeter-scale meta-holograms at a time. To prove the efficiency of the proposed manufacturing method, a meta-hologram was designed and manufactured using PER. The meta-hologram recorded 67.1% efficiency at 450 nm, 54.8% at 532 nm, and 39.3% at 635 nm. Therefore, it has been proved that practical meta-holograms can be produced even if they are replaced with low-cost and high-productivity processes.
10 - Scalable production of meta-surface using BaTiO3 nanoparticle-embedded resin Poster [Show abstract]
  • Seungyeon Lee, Korea University, Korea (South)
In this study, we fabricated a high-performance meta-hologram using BaTiO₃nanoparticle-embedded resin (nano-PER) via nanoimprint lithography. BaTiO₃offers a high refractive index, low extinction coefficient, and ferroelectric properties. By uniformly dispersing these nanoparticles in nano-PER, we developed an optimized resin and mass-produced meta-holograms.
11 - Reverse Design of Correlated Disorder Meta-Surfaces for Light Trapping in (Ultra-)Thin Film Solar Cells Poster [Show abstract]
  • Anja Tiede, École Polytechnique Fédérale de Lausanne, Switzerland
  • Nick Feldman, AMOLF, The Netherlands
  • Alexander Lambertz, AMOLF, The Netherlands
  • Femius Koenderink, AMOLF, The Netherlands
  • Anna Fontcuberta i Morral, École Polytechnique Fédérale de Lausanne, Switzerland
  • Esther Alarcon-Lladó, AMOLF, The Netherlands
We present a method to create correlated disordered metasurfaces with independent angular and spectral scattering response control. It is founded on reverse-engineering the Fourier space and blob detection, incorporating a decoration step to leverage individual resonances in nano-scatterers. We demonstrate its effectiveness as light trapping in thin film solar cells using earth-abundant zinc phosphide.
12 - Inverse Design of Photonic Metasurfaces through Physics-informed Deep Learning using a Rigorous Point-dipole Scattering Model Poster [Show abstract]
  • Timo Gahlmann, Amolf, Netherlands
  • Femius Koenderink, Amolf, Netherlands
  • Ewold Verhagen, Amolf, Netherlands
We present a physics-informed deep-learning approach for the inverse design [1–6] of pho- tonic metasurfaces. By embedding an analytic multiple-scattering model employing Ewald summation of dipolar lattices into the network, it is infused with a rigorous theory of scattering and diffraction, enforcing symmetries and conservation laws in each forward pass. This leads to better resonance prediction and enables rapid design generation once trained.
13 - Design And Development Of Metaoptics For Vortex Beam Generation In The Infrared Poster [Show abstract]
  • Philippe Clouet, DOTA, ONERA, Université Paris-Saclay, France
  • Patrick Bouchon, DOTA, ONERA, Université Paris-Saclay, France
  • Julien Jaeck, DOTA, ONERA, Université Paris-Saclay, France
2-dimensionnal arrays made of sub-wavelength nanostructures can manipulate electromagnetic waves. Here we conceive an optical vortex generator working in the near-infrared. The component can be used into a Coherent Beam Combining (CBC) system.
14 - Large-area Nanophotonic Scintillators for X-ray Imaging Poster [Show abstract]
  • Louis Martin-Monier, Massachusetts Institute of Technology, USA
  • Simo Pajovic, Massachusetts Institute of Technology, USA
  • Muluneh G. Abebe, Massachusetts Institute of Technology, USA
  • Joshua Chen, Massachusetts Institute of Technology, USA
  • Sachin Vaidya, Massachusetts Institute of Technology, USA
  • Seokhwan Min, Korea Advanced Institute of Science and Technology, South Korea
  • Seou Choi, Massachusetts Institute of Technology, USA
  • Steven E. Kooi, Massachusetts Institute of Technology, USA
  • Bjorn Maes, Massachusetts Institute of Technology, USA
  • Juejun Hu, Massachusetts Institute of Technology, USA
  • Marin Soljačić, Massachusetts Institute of Technology, USA
  • Charles Roques-Carmes, Massachusetts Institute of Technology, USA
Nanophotonic scintillators, which feature nanostructures at the scale of their emission wavelength, provide a promising approach to enhancing light yield with a substantially reduced thickness. Here, we demonstrate a six-fold emission enhancement over a wafer scale area of 4 cm x 4 cm and 0.5 mm thickness. This facilitates the development of brighter and thinner X-ray scintillators, which could lead to low-dose and high-resolution X-ray imaging with promising applications in medical imaging and nondestructive inspection.
15 - Periodic Via Hole Loaded Transmission Line for Harmonic Suppression Poster [Show abstract]
  • Jie Ma, Southeast University, China
  • Liwei Yan, Southeast University, China
  • Zhanyi Fu, Southeast University, China
  • Han Zhang, Southeast University, China
  • Yang Kuai, Southeast University, China
  • Yang Fei, Southeast University, China
<p> This paper investigates a non-planar transmission line periodically loaded with via holes, which is modeled and validated through full-wave electromagnetic simulations. The transmission characteristics and calculated characteristic impedance are reported. A parametric analysis of the unit cell is conducted to predict the stopband behavior of the transmission line. Due to its compact structure, the artificial transmission line is particularly useful for optimizing circuit size and suppressing spurious signals, making it highly suitable for miniaturization and performance enhancement.</p>
16 - Achieving Glide-Like Dispersion Properties in Broken-Glide Symmetric Structures Poster [Show abstract]
  • Dubravko Tomić, University of Zagreb, Croatia
  • Zvonimir Šipuš, University of Zagreb, Croatia
This paper explores the propagation properties of glide-symmetric and broken-glide symmetric dielectric periodic structures, focusing on tailoring the dispersion characteristics in asymmetric configurations. Using the Frobenius norm to quantify the similarity of the broken-glide symmetric submatrix to the glide-symmetric submatrix, we demonstrate that careful parameter optimization can enable broken-glide structures to mimic glide-like behavior. This approach provides a pathway for achieving glide-like dispersion in structurally asymmetric systems, expanding the design flexibility for applications in microwave and optical devices.
17 - Plasmonic multipod clusters as emitters of magnetic light Poster [Show abstract]
  • Joshua Davis, University of Bordeaux, CRPP, France
  • Sébastien Bidault, Institut Langevin, ESPCI, France
  • Mathieu Mivelle, Sorbonne Université, INSP, France
  • Mona Tréguer-Delapierre, University of Bordeaux, ICMCB, France
  • Alexandre Baron, University of Bordeaux, CRPP, Institut Universitaire de France, France
We design magnetic optical emitters based on plasmonic multipod structures. By employing quasinormal modes we are able vastly decrease the optimization parameter space and successfully achieve isotropic magnetic Purcell factors larger than 180. Additionally, we show the relationship between symmetries of the emitter and its use as an isotropic emitter.
18 - Plasmonic Smith-Purcell Metagratings Generate Polarization-Tunable Free-Electron Radiation Poster [Show abstract]
  • Hollie Marks, NWO-Institute AMOLF, Netherlands
  • Matthias Liebtrau, NWO-Institute AMOLF, Netherlands
  • Albert Polman, NWO-Institute AMOLF, Netherlands
Merging plasmonic metasurface design concepts with free-electron radiation phenomena presents a powerful approach to investigate and shape the interaction between light, plasmons, and electrons. Here, we demonstrate a metasurface that generates polarization-tunable free-electron-driven photon emission, based on spatially-selective excitation of plasmonic modes within gold nanostructures.
19 - Optical Tomography- Reconstructing Plasmonic Structures Below The Diffraction Limit Poster [Show abstract]
  • Ethan Kensett, AMOLF, Netherlands
  • Wiebke Albrecht, AMOLF, Netherlands
This project aims to resolve (sub-)nanometer nanoparticle morphologies by optical tomography. Polarization dependent scattering patterns enable the reconstruction of 3D nanoparticle shapes via deep neural networks, offering an optical-only approach analogous to electron tomography, without the associated limitations of electron microscopy.
20 - Graviton-Polaritons in FQH Systems Coupled to Optical Cavities Poster [Show abstract]
  • Daniele Battesimo Provenzano, Scuola Normale Superiore, Italy
  • Zeno Bacciconi, International School for Advances Studies and The Abdus Salam International Centre for Theoretical Physics, Italy
  • Marcello Dalmonte, The Abdus Salam International Centre for Theoretical Physics, Italy
  • Iacopo Carusotto, INO-CNR Pitaevskii BEC Center University of Trento, Italy
  • Giuseppe la Rocca, Scuola Normale Superiore and National Enterprise for nanoScience and nanoTechnology, Italy
We investigate the coupling of a fractional quantum Hall (FQH) layer with the electromagnetic field of a high-Q optical cavity. By deriving the response function of the FQH layer, we reveal anisotropic behavior similar to gyrotropic media and propose an experiment to detect graviton-polariton excitations through cavity mode shifts.
21 - Exploring Mesoscopic Plasmonics by Integrating Transformation Optics and Feibelman d Parameters Poster [Show abstract]
  • Fan Yang, Sichuan University, China
Classical electrodynamics falls short in capturing plasmonic responses at the mesoscopic scale. Therefore, we introduce an innovative analytical framework that synergizes transformation optics with Feibelman d parameters. This approach offers a more efficient pathway to explore electronic nonclassical effects in complex nanostructures, surpassing the limitations of traditional density functional methods.
22 - Composite Gold-Vanadium-Dioxide Reconfigurable Plasmonic Devices Poster [Show abstract]
  • Vlastimil Křápek, Brno University of Technology, Czech Republic
  • Rostislav Řepa, Brno University of Technology, Czech Republic
  • Jiří Liška, Brno University of Technology, Czech Republic
  • Peter Kepič, Brno University of Technology, Czech Republic
  • Jiří Kabát, Brno University of Technology, Czech Republic
  • Michal Horák, Brno University of Technology, Czech Republic
  • Tomáš Šikola, Brno University of Technology, Czech Republic
<p> The lateral arrangement of self-assembled VO2 nanoparticles and gold nanostructures fabricated by electron beam lithography is presented as a suitable platform for composite reconfigurable plasmonic devices. Two specific reconfigurable devices are demonstrated: Electric-magnetic switches and resonance-energy switches.</p>
23 - Strong light-matter coupling in a Graphene-Cube-Micro-Cavity Poster [Show abstract]
  • Julieta Olivo, CONICET, Universidad Austral, Universidad de Buenos Aires, Argentina
  • Hernán Ferrari, CONICET, Universidad Austral, Argentina
  • Mauro Cuevas, CONICET, Universidad Austral, Argentina
The present work deals with the study of a 3D-graphene-cube cavity, designed to strengthen the interaction between a quantum emitter (QE) and surface plasmon (SP) fields. This setup generates two distinct plasmonic modes: a high-frequency mode associated with SPs on the graphene sheet, and a low-frequency mode resulting from the reflection of SP fields between the graphene sheet and the micro-cube base. When coupled to these modes, the QE relaxation rate increases significantly compared to free-space conditions, while its population dynamics can display oscillatory, reversible patterns. We show that, for specific values of the system parameters, the population of the quantum emitter can become trapped in the excited state, leading to the formation of a bound state within the environment. This finding opens up new possibilities for designing chip-scale quantum plasmonic devices, offering a unique approach to controlling light-matter interactions at the nanoscale.
14:00 - 15:30 - Oral Sessions (Monday Afternoon 1)
14:00 - Technologies and Modeling Approaches for Reconfigurable Microwave Metasurfaces

Session chairperson(s): Sergei Tretyakov; Arthur Yaghjian

14:00 - 14:30 - Plasma-Based Metastructures for Reconfigurable Microwave Devices Invited oral [Show abstract]
  • Alessio Monti, Roma Tre University, Italy
  • Mohammad G. H. Alijani, Roma Tre University, Italy
  • Mirko Barbuto, Roma Tre University, Italy
  • Stefano Vellucci, Niccolò Cusano University, Italy
  • Alessandro Toscano, Roma Tre University, Italy
  • Filiberto Bilotti, Roma Tre University, Italy
Reconfigurability is a key requirement for future wireless systems, enabling dynamic control of electromagnetic behavior. Metastructures offer an effective way to embed reconfigurability into conventional components like antennas. Among various tuning methods, the use of plasma discharges is particularly attractive due to their wide tunability, fast response, and high-frequency compatibility. In this talk, we present some examples of plasma-based metastructures for microwave applications: a horn antenna with a reconfigurable plasma superstrate, and a tunable metagrating based on plasma cylinders. We demonstrate how controlling plasma parameters enables beam steering and pattern shaping.
14:30 - 15:00 - Mutual Coupling in Reconfigurable Wave Systems Invited oral [Show abstract]
  • Philipp del Hougne, CNRS, IETR - Univ Rennes, France
Dynamic metasurface antennas (DMAs), reconfigurable intelligent surface (RISs), and wave-based physical neural network (PNNs) are prominent contemporary examples of reconfigurable wave systems. Due to mutual coupling, their transfer functions depend in general non-linearly on the configuration of their tunable elements. Mutual coupling is hence often mitigated to simplify the configuration optimization. However, this reasoning overlooks that mutual coupling boosts the strength of the transfer function dependence on the tunable elements' configurations. First, I will present theoretical, numerical, and experimental evidence to demonstrate that the control over a DMA's radiation pattern substantially increases with the mutual coupling strength. Second, to reap this benefit of mutual coupling, I will pave the way toward in-software model-based optimizations of reconfigurable wave systems. Specifically, I will discuss a universal model-based framework for wave control in reconfigurable wave systems. I will report experimental evidence showing that the Virtual VNA method can unambiguously retrieve the model parameters, even for non-reciprocal systems and under limitations to non-coherent detection.
15:00 - 15:30 - Wavefront Control using Transmissive Electromagnetic Surfaces: from PIN Diode based Architectures to Advanced Microelectronic Technologies Invited oral [Show abstract]
  • Antonio Clemente, CEA, Leti, France
Programmable electromagnetic (EM) surfaces and/or metasurfaces offer a highly effective solution for electronically shaping, controlling and manipulating EM waves. This ability opens up a myriad of possibilities across various fields, including telecommunications, radar, imaging, sensing, and even cloaking technology. Unlike traditional phased arrays, which rely on phase shifters and power amplifiers, programmable EM surfaces are typically passive radiative architectures. They integrate components such as varactors, RF-MEMS, p-i-n diodes, varactors, or liquid crystals to electronically control the local surface phase gradient and / or impedance characteristics. Based on the technology used in the unit cell (UC), EM surfaces can be classified as active or passive. Active EM surfaces amplify reflected or transmitted signals using active elements in the UCs, while passive ones use low-loss reactive components to implement either continuous or quantized phase shifts, resulting in energy-efficient devices.
14:00 - Physics of Complex EM Media II

Session chairperson(s): Che Ting Chan; Maxim Gorkunov

14:00 - 14:30 - Continuous-Wave Nonlinear Polarization Control and Signatures of Criticality in a Perovskite Cavity Invited oral [Show abstract]
  • Said Rahimzadeh Kalaleh Rodriguez, AMOLF, Netherlands
We present the first observation of continuous wave nonlinear phenomena in a halide perovskite. Using an optical cavity containing a perovskite crystal, we demonstrate optical bistability, nonlinear control over the polarization state of light, and signatures of criticality.
14:30 - 14:45 - Quantum Metasurfaces for Enhancement of Reverse Saturable Absorption Oral [Show abstract]
  • Ioannis Katsantonis, ITE (FORTH) GREECE, Greece
  • Maria Kafesaki, ITE (FORTH) GREECE, Greece
<p> Reverse saturable absorption (RSA) occurs in nonlinear materials where the excited state exhibits higher absorption than the ground state. This study develops a full-wave spatio-temporal numerical model coupling quantum systems with Maxwell’s equations to accurately simulate RSA. By integrating RSA materials with metasurfaces, we achieve over twice the absorption enhancement compared to a bare layer. This approach enables the design of low-power, highly efficient optical absorption devices, with applications in protective optics and photonic components.</p>
14:45 - 15:00 - Optimal matrix-based spatiotemporal wave control in disordered media Oral [Show abstract]
  • Clément Ferise, University of Rennes, France
  • Philipp del Hougne, University of Rennes, France
  • Matthieu Davy, University of Rennes, France
We present and experimentally verify a matrix approach to identifying optimal input wavefront in both space and time domain for arbitrary wave-control functionality, irrespective of the complexity of wave scattering. We leverage a singular value decomposition of a transport matrix that fully captures how both the spatial and temporal degrees of freedom available to shape the input wavefront impact the output wavefront's spatial and temporal form.
15:00 - 15:15 - Effect of Disorder in 3D Photonic Networks on their Photonic Band Gaps Oral [Show abstract]
  • Florin Hemmann, Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Vincent Glauser, Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Ullrich Steiner, Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Matthias Saba, Adolphe Merkle Institute, University of Fribourg, Switzerland
Complete photonic band gaps are frequency domains where light cannot enter a dielectric structure from any angle due to an interference-induced vanishing density of states. Band gaps can be found in binary structures with high dielectric contrast above 4. These phenomena are well understood for periodic systems, so-called photonic crystals, but band gaps are also found in amorphous photonic networks. Here, we investigate how different types of disorder in the network’s simplices affect the photonic density of states. Using a Metropolis Monte Carlo algorithm, we generate a large population of 3D random networks with tunable statistics in the bond angle and length distribution. We calculate the photonic density of states of these random networks and correlate it to the statistical variations.
15:15 - 15:30 - Mechanisms of Passive Intermodulation in Contact Junctions of Good Conductors Oral [Show abstract]
  • Alex Schuchinsky, University of Liverpool, United Kingdom
  • Yi Huang, University of Liverpool, United Kingdom
The concurrent multiphysics effects of charge tunnelling, and contact thermal and mechanical deformations are studied in joints of conductors with rough surfaces. It is shown that the charge tunnelling is dominant in the nonlinear contact resistance whilst the effects of heating and mechanical deformations are weaker.
14:00 - Metamaterials and Nanophotonics Enabled Novel Metrology

Session chairperson(s): Paloma Arroyo Huidobro

14:00 - 14:30 - Harnessing Fisher Information for Optical Metrology with Plasmonics and Topological light Invited oral [Show abstract]
  • Cheng-Hung Chi, University of Southampton, United Kingdom
  • Huanli Zhou , University of Southampton, United Kingdom
  • Thomas Grant, University of Southampton, United Kingdom
  • Stefan Rotter, Vienna University of Technology , Austria
  • Kevin Macdonald, University of Southampton, United Kingdom
  • Nikolay Zheludev, University of Southampton, United Kingdom
In optical metrology, the limit of precision depends on the total Fisher information accessible in a measurement. We show that the flow of Fisher information can be enhanced by using topologically structured light and resonant plasmonic structures and that the total amount of Fisher information can be resonantly enhanced with plasmonic cavities. Optical metrology with sub-atomic precision (~ λ/10,000) is demonstrated that traces the positional coordinate of a nanowire exhibiting Brownian motion with a sampling frequency of 1MHz.
14:30 - 14:45 - Deeply Subwavelength Critical Dimension Metrology with Structured Void Metasurfaces Oral [Show abstract]
  • Falco Bijloo, AMOLF, Netherlands
  • Arie den Boef, ASML, Netherlands
  • Peter Kraus, ARCNL, Netherlands
  • Femius Koenderink, AMOLF, Netherlands
Fano resonances in dielectric metasurfaces, arising from quasi-bound states in the continuum, show extreme sensitivity to nanoscale geometric perturbations. We exploit this sensitivity to detect minute linewidth variations by structurally infilling the voids of a dielectric disk-hole metasurface. This approach offers high-throughput and sensitivity critical dimension metrology in semiconductor manufacturing.
14:45 - 15:00 - Information Advantage In Sensing Revealed By Fano Resonant Fourier Scatterometry Oral [Show abstract]
  • Nick Feldman, AMOLF, Netherlands
  • Arie den Boef, ARCNL, ASML, Netherlands
  • Lyuba Amitonova, ARCNL, Netherlands
  • Femius Koenderink, AMOLF, Netherlands
We experimentally demonstrate that analyzing the scattering of a Fano resonant metasystem in k-space provides quantitatively more information in a sensing context compared to conventional analysis of spectral lineshapes. We thoroughly characterize deeply subwavelength structural perturbations within dielectric Fano resonant metarings using a dark-field spectroscopic approach, and a Fourier scatterometry based approach, and show that perturbations can induce pronounced resonant directional scattering in k-space. Finally, by using information theory, we quantitatively compare these two sensing strategies by evaluating their inherent Fisher information content, and show that an information advantage can be gained from a k-space measurement.
15:00 - 15:30 - Neural Network-Based Conductivity Imaging Using Time-Domain Reflectometry Invited oral [Show abstract]
  • Xinying Li, University of Oxford, UK
  • Georgiana Dima, University of Oxford, UK
  • Anna Radkovskaya, University of Oxford, UK
  • Jiaruo Yan, FORTH-IESL, Greece
  • Chris Stevens, University of Oxford, UK
  • Laszlo Solymar, University of Oxford, UK
  • Ekaterina Shamonina, University of Oxford, UK
<p> We present a neural network-based approach for sensing conductive objects using time-domain reflectometry of magnetoinductive (MI) waves in metamaterials with inter-element coupling. Our method significantly improves previously reported accuracy and expands the detection range, enabling simultaneous localisation of multiple conductive objects and paving the way for real-time, contactless imaging of inhomogeneous conductive media, with potential applications ranging from 3D printing quality control to medical imaging.</p>
14:00 - Advanced Analytical Methods in Metamaterials and Metasurfaces

Session chairperson(s): Carlo Forestiere; Sander Mann

14:00 - 14:30 - Susceptibility of Time-Variant Metamaterial Systems: Classical Convolution vs. ODEs with Non-local Forcing Invited oral [Show abstract]
  • Alexander Kildishev, Elmore Family School of Electrical and Computer Engineering, Birck Nanotechnology Center and Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, IN 47907, USA, USA
  • Ludmila Prokopeva, Elmore Family School of Electrical and Computer Engineering, Birck Nanotechnology Center and Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, IN 47907, USA, USA
We investigate the relationship between convolution integral representation and differential equations for disordered and time-variant systems with Gaussian-damped sinusoidal impulse response. While the impulse response satisfies a specific ordinary differential equation (ODE), we demonstrate that the general response does not satisfy this same equation. We derive an alternative ODE formulation that preserves the standard convolution form while adaptively accounting for time-variance through time and input-dependent terms. Numerical validation confirms agreement between the proposed adaptive ODE solutions and exact convolution results for various input signals. This approach enables efficient time-domain numerical schemes with controlled accuracy bounds for modeling susceptibility in metasystems with spatial disorder and external temporal control.
14:30 - 14:45 - GSTCs A Connection To Exact Spherical Multipoles Oral [Show abstract]
  • Hossein Allahverdizadeh, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland
  • Karim Achouri, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland
Metasurfaces manipulate electromagnetic properties using subwavelength structures. Traditional GSTC methods focus on far-field effects, neglecting near-field distributions. This work extends GSTC via multipolar decomposition, linking near- and far-fields while accommodating oblique incidence and different background media. It provides a systematic approach to analyzing metasurface behavior in complex environments.
14:45 - 15:00 - Efficient Description of Meta-Atoms: On the Pole Expansion of the T-matrix Oral [Show abstract]
  • Jan David Fischbach, Institute of Nanotechnology at Karlsruhe Institute of Technology, Germany
  • Fridtjof Betz, Zuse Institute Berlin, Germany
  • Felix Binkowski, Zuse Institute Berlin, Germany
  • Sven Burger, Zuse Institute Berlin, JCMwave GmbH, Germany
  • Martin Hammerschmidt, JCMwave GmbH, Germany
  • Markus Nyman, Institute of Nanotechnology at Karlsruhe Institute of Technology, Germany
  • Carsten Rockstuhl, Institute of Nanotechnology at Karlsruhe Institute of Technology, Institute of Theoretical Solid State Physics at Karlsruhe Institute of Technology, Germany
The transition matrix (T-matrix) encapsulates the linear scattering properties of meta-atoms. Conventionally one T-matrix is calculated per frequency, resulting in excessive computational costs when treating metamaterials supporting sharp resonances. Instead, we introduce a pole expansion representation of the frequency dependent T-matrix via the AAA algorithm for rational approximation.
15:00 - 15:15 - Revisiting Bianisotropic Photonics with Coupled-Mode Theory Oral [Show abstract]
  • Luis Manuel Máñez Espina, Universitat Politècnica de València, Spain
  • Bahman Amrahi, Aalto University, Finland
  • Viktar Asadchy, Aalto University, Finland
  • Ana Díaz-Rubio, Universitat Politècnica de València, Spain
Metasurfaces have been extensively studied using homogenization techniques, which leverage the subwavelength nature of meta-atoms to model their electromagnetic response. While these approaches are effective in the microwave regime, they face challenges at optical frequencies due to weaker mode confinements and larger sizes of the meta-atoms compared to the wavelength. Coupled-mode theory has emerged as a powerful phenomenological model to describe resonant behavior in photonic structures. In this work, we explore the connection between coupled-mode theory and the bianisotropic homogenization models. By analyzing the interplay between the mode coupling strength and bianisotropic effects, we establish a direct relationship between resonant mode interactions and metasurface scattering properties. Our findings provide new insights into the physics of photonic metastructures and offer a unified perspective for modeling their electromagnetic behavior.
15:15 - 15:30 - Phase singularies in resonant metasurfaces Oral [Show abstract]
  • Rémi Colom, Universite Cote d’Azur, CNRS, CRHEA, France
Metasurfaces are non-Hermitian systems prone to scattering and absorptive losses, leading to resonances with finite lifetimes tied to complex eigenfrequencies. Studying the optical response at complex frequencies provides insights into their behavior. Here, we highlight the role of phase singularities in response functions (like reflection and transmission coefficients) at complex frequencies and their impact on the optical response at real frequencies.
14:00 - Two-dimensional Materials

Session chairperson(s): yohannes abate; ANNA TASOLAMPROU

14:00 - 14:30 - Multilayered Transition Metal Dichalcogenides as Platforms for Nanophotonic Applications Invited oral [Show abstract]
  • Su-Hyun Gong, Korea University, Korea (South)
Multilayered transition metal dichalcogenides (TMDs) offer a versatile platform for nanophotonic applications. With high dielectric constants, they enable exciton-polariton waveguiding and enhanced light control. Recent demonstrations include ultra-thin waveguides, Mach-Zehnder interferometers, and unidirectional radiation from bilayer metasurfaces, showcasing their potential for advanced light manipulation.
14:30 - 14:45 - Ultrafast Dynamics of Strongly Coupled Bound State in the Continuum in a WS2 Metasurface Oral [Show abstract]
  • Cristina Cruciano, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, Milano, 20133, MI, Italy, Italy
  • Luca Sortino, Ludwig-Maximilians-Universität München, Faculty of Physics, Chair in Hybrid Nanosystems, 80539 Munich, Germany, Germany
  • Armando Genco, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, Milano, 20133, MI, Italy, Italy
  • Michele Guizzardi, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, Milano, 20133, MI, Italy, Italy
  • Jonathan O. Tollerud, Optical Sciences Centre, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia, Australia
  • Thomas Weber, Ludwig-Maximilians-Universität München, Faculty of Physics, Chair in Hybrid Nanosystems, 80539 Munich, Germany, Germany
  • Francesco Gucci, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, Milano, 20133, MI, Italy, Italy
  • Daniel Timmer, Physics Department and Center for Nanoscale Dynamics (CeNaD), Carl von Ossietzky Universität Oldenburg, D-26129 Oldenburg, Germany, Germany
  • Matteo Corti, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, Milano, 20133, MI, Italy, Italy
  • Gianluca Valentini, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, Milano, 20133, MI, Italy, Italy
  • Cristian Manzoni, Istituto di Fotonica e Nanotecnologie (IFN), CNR, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy, Italy
  • Christoph Lienau, Physics Department and Center for Nanoscale Dynamics (CeNaD), Carl von Ossietzky Universität Oldenburg, D-26129 Oldenburg, Germany, Germany
  • Stefano Dal Conte, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, Milano, 20133, MI, Italy, Italy
  • Jeffrey A. Davis, Optical Sciences Centre, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia, Australia
  • Stefan A. Maier, School of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia, Australia
  • Andreas Tittl, Ludwig-Maximilians-Universität München, Faculty of Physics, Chair in Hybrid Nanosystems, 80539 Munich, Germany, Germany
  • Giulio Cerullo, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, Milano, 20133, MI, Italy, Italy
We study a WS2 metasurface that supports strong coupling between photonic bound state in the continuum and exciton, exploiting k-space and pump-probe spectroscopy to characterize the dispersion and the ultrafast dynamics of the sample.
14:45 - 15:00 - Smith-Purcell Lensing using 2D-nanoribbon Metasurfaces Oral [Show abstract]
  • Alvaro Roriguez Echarri, Center for Nanophotonics, NWO Institute AMOLF, Netherlands
  • Eduardo Dias, POLIMA - Center for Polariton-driven Light - Matter Interactions, University of Southern Denmark, Denmark
  • Joel Cox, POLIMA - Center for Polariton-driven Light - Matter Interactions, University of Southern Denmark, Denmark
  • Albert Polman, Center for Nanophotonics, NWO Institute AMOLF, Netherlands
  • Javier García de Abajo, ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Spain
In this work, we explore the interaction of swift electrons with metasurfaces to create radiation via the so-called Smith-Purcell effect. From a theory viewpoint, we introduce a scheme to actively control the light-matter interaction properties and structure the emitted light using 2D nanoribbons.
15:00 - 15:30 - Exciton Transfer Mechanisms in Ruddlesden Popper Perovskites Probed by Cathodoluminescence and Photoluminescence Spectroscopy Invited oral [Show abstract]
  • Maximilian Black, Kiel University, Germany
  • Paul H. Bittorf, Kiel University, Germany
  • Sara Darbari, Kiel University, Germany
  • Parsa Darman, Kiel University, Germany
  • Masoud Taleb, Kiel University, Germany
  • Yaser Abdi, Kiel University, Germany
  • Nahid Talebi, Kiel University, Germany
<p> We explore the underlying mechanisms for the formation of self-hybridized exciton polaritons as well as excitonic diffusion in hybrid perovskites and hexagonal boron nitride heterostructures. Enabled by a newly-developed fiber-based cathodoluminescence detector, we demonstrate an ultra-long diffusion mechanism enabled by exciton-defect coupling in perovskite and hexagonal boron nitride heterostructures.</p>
15:30 - 16:00 - Coffee Break (Monday Afternoon)
16:00 - 18:00 - Oral Sessions (Monday Afternoon 2)
16:00 - Physical Review Special session
16:00 - 16:30 - Steering Loss with Hyperbolic Shear Metasurfaces Invited oral [Show abstract]
  • Emanuele Galiffi, Advanced Science Research Center, City University of New York, USA
  • Simon Yves, Institut Langevin, ESPCI, Paris, France
  • Enrico Maria Renzi, Advanced Science Research Center, City University of New York, United States
  • Andrea Alu, Advanced Science Research Center, City University of New York, United States
Following the recent discovery of hyperbolic shear polaritons in monoclinic materials, we introduce hyperbolic shear metasurfaces, enabling loss mitigation for hyperbolic metamaterials. In these metastructures, thanks to the frequency-dependent rotation of the optical axis caused by the coupling between in-plane polarizability components, dissipative processes are diverted towards one hyperbolic arm, while dramatically reducing the effect of loss of the opposite one, leading to long-lived hyperbolic modes with enhanced tunability and directionality.
16:30 - 17:00 - Programmable Viscosity Metafluids: Designing fluid properties using temporal superposition of shear and acoustics Invited oral [Show abstract]
  • Meera Ramaswamy, Princeton University, USA
  • Prateek Sehgal, Cornell University, USA
  • Edward Y. X Ong, Cornell University, USA
  • Christopher Ness, University of Edinburgh, United Kingdom
  • Itai Cohen , Cornell University, USA
  • Brian Kirby, Cornell University, USA
Metamaterials are composite structures whose extraordinary properties arise from a mesoscale organization of their constituents. Here, we introduce a new material class-- viscosity metafluids. Specifically, we demonstrate that we can rapidly drive large viscosity oscillations in shear-thickened fluids using acoustic perturbations with kHz to MHz frequencies. Because the time scale for these oscillations can be orders of magnitude smaller than the timescales associated with the global material flow, we can construct metafluids whose resulting time averaged viscosity is a composite of the thickened, high-viscosity and dethickened, low-viscosity states. We show that viscosity metafluids can be used to engineer a variety of unique properties including zero, infinite and negative viscosities. The high degree of control over the resulting viscosity, the ease with which they can be accessed, and the variety of exotic properties achievable make viscosity metafluids attractive for uses in technologies ranging from coatings to cloaking to 3D printing.
17:00 - 17:30 - Topological Photonics Without Periodicity: Photonic Alloy Invited oral [Show abstract]
  • Che Ting Chan, HKUST, Hong Kong
We introduce the notion of photonic alloys, a new class of disordered topological materials realized in 2D magnetic photonic crystals. Photonic alloys exhibit topological characteristics, including chiral edge states, even at low concentrations of magnetized rods. The topology is characterized by the winding of the reflection phase, which remains well-defined without a band structure.
17:30 - 18:00 - Approaching the limits of passive bandwidth-integrated optical response: Maximum cloaking and Purcell enhancement in structured media Invited oral [Show abstract]
  • Alejandro Rodriguez, Princeton University, USA
We present recent optimization results relating to the problems of modifying the bandwidth-integrated cloaking and local-density of states, including bounds and scaling laws for finite bandwidth sources. We also demonstrate the possibility of designing scatterers approaching these limits by introducing a “verlan” method that exploits local and global wave information encoded in performance bounds to guide inverse design towards better-performing structures, highlighting the possibility of accessing significant untapped performance improvements.
16:00 - Time-Varying Photonics I

Session chairperson(s): Nikolay Zheludev; Alexander Kildishev

16:00 - 16:30 - Modulating Optical Properties in Time Using Plasmonic Resonances Invited oral [Show abstract]
  • John Pendry, Imperial College London, United Kingdom
With the growing interest in extreme time modulation of material properties attention has turned to materials such as Indium Tin Oxide which is commonly doped to give a Fermi energy of around 1eV and plasma frequency, , of similar magnitude. Thin films of ITO are transparent to visible light with frequency well above . It is well known that heating the electrons with a fast laser pump pulse lowers and hence switches between opaque and transparent for near IR radiation. Along with extremely rapid switching times of the order of the few cycles, contrast levels of the order of 50% are commonly observed. Basics of the mechanism are understood: rapid heating of electrons followed by slow equilibration with lattice phonons. Controversy over details remains, but recent experiments shed light on the time scales of the several processes taking place. Experiments in Sapienza's group at Imperial College revealed the existence of extremely fast processes by generating Young's fringes in frequency. It was evident from these experiments that switching happened faster than any of the known time scales: 100fs pulse width for the pump and probe, 300fs electron-electron scattering time. The origin of the fast event will remain a mystery until the excitation process can be probed with single cycle pulse widths.
16:30 - 17:00 - Time-varying nanophotonics Invited oral [Show abstract]
  • Paloma Arroyo Huidobro, Universidad Autónoma de Madrid, Spain
The optical response of nanophotonic implementations of photonic time crystals will be discussed. Optical scattering by time-modulated, frequency-dispersive, slabs and nanoparticles is fundamentally different from scattering by their static counterparts. Optical modes sustained by these nanophotonic structures interact through the temporal modulation, giving rise to different instances of complex-frequency band gaps, which host amplifying states.
17:00 - 17:15 - Temporal Degrees of Freedom, Causality, and Fundamental Limits in Electromagnetics and Photonics Oral [Show abstract]
  • Matteo Ciabattoni, Cornell University, USA
  • Mohammadreza Salehi, Cornell University, USA
  • Francesco Monticone, Cornell University, USA
Using time as an additional degree of freedom in electromagnetism, photonics, and wave physics is attracting significant research interest, motivated by the possibility of creating efficient electromagnetic and photonic devices, potentially surpassing various well-established performance limits. Many of these physical limits are derived under assumptions of linearity and time-invariance and are deeply related to the principle of causality. We will briefly review these ideas, and will then discuss some of our latest research efforts.
17:15 - 17:30 - Photonic Time Quasicrystals Oral [Show abstract]
  • Marino Coppolaro, University of Sannio, Italy
  • Massimo Moccia, University of Sannio, Italy
  • Giuseppe Castaldi, University of Sannio, Italy
  • Vincenzo Galdi, University of Sannio, Italy
We introduce a framework for analyzing photonic time quasicrystals (PTQCs) using substitutional sequences to model aperiodic temporal modulations. Extending trace map methods to the time domain, we examine wave transport and spectral properties, focusing on the Thue-Morse sequence. Our findings reveal distinctive PTQC behaviors, including multiscale spectra and localization effects, with potential for advanced photonic applications.
17:30 - 17:45 - Adiabatic Photonic Time Crystals in an Optical Cavity Oral [Show abstract]
  • Mohamed H. Mostafa, Aalto University, Finland
  • Emanuele Galiffi, Advanced Science Research Center, City University of New York, United States of America
  • Shixiong Yin, Advanced Science Research Center, City University of New York, United States of America
  • Sergei Tretyakov, Aalto University, Finland
  • Andrea Alù, Advanced Science Research Center, City University of New York, United States of America
Experimental realizations of photonic momentum bandgaps have been constrained to radio frequencies, as the typical slow relaxation times of dispersive optical materials constitute a key bottleneck to their realization at higher frequencies. Here, we demonstrate that to realize a photonic momentum bandgap, it is sufficient that only the rise in the refractive index occurs rapidly, while the relaxation process can proceed adiabatically, without any speed limitations, as long as the phase accumulation during the relaxation time is accounted for. This approach paves the way for the observation and use of momentum bandgaps at near-optical frequencies.
17:45 - 18:00 - Nonlinear Optical Response in a Time Crystal Oral [Show abstract]
  • Jinxiang Li, Nanyang Technological University, Singapore
  • Giorgio Adamo, Nanyang Technological University, Singapore
  • Nikolay Zheludev, University of Southampton, United Kingdom
We report on the nonlinear optical properties of a Time Crystal in the mobilized state. In a metamaterial made of nonreciprocally coupled dielectric nanowires, a control light modulates the amplitude and frequency of the mobilized state oscillations leading to nonlinear mixing of the mobilized state and control light frequencies.
16:00 - Non-reciprocal and Topological EM Metamaterials

Session chairperson(s): Nasim Mohammadi Estakhri; Rachel Grange

16:00 - 16:15 - Renormalization Group of Topological Scattering Networks under Strong Disorder Oral [Show abstract]
  • Zhe Zhang, c, Switzerland
  • Romain Fleury, Renormalization Group of Topological Scattering Networks under Strong Disorder, Switzerland
Strong disorder localizes bulk states, and can induce the so-called Anderson insulating phase. The only possibility to escape from this trivialization lies on the anomalous Floquet Anderson insulating phase- a unique phase in Floquet topological systems- where topological chiral edge states survive and fill all the quasienergy spectrum. Exploring such topological phases and phase diagrams in strongly disordered systems is of both theoretically and practically crucial. However, it requires new theoretical tools beyond traditional Hamiltonian-based methods and topological band invariants. Here, we introduce a novel real-space renormalization group (RG) scheme tailored specifically to unitary scattering networks under strong disorder. Our RG approach utilizes iterative block-scattering transformations, preserving crucial topological scattering characteristics. By doing so, we identify robust scattering attractors distinguishing trivial Anderson insulators from anomalous Floquet Anderson insulators, allowing the definition of a topological phase diagram even under strong disorder. Numerical validations through scaling analyses on localization length, along with experimental demonstrations using microwave scattering networks, confirm our findings. This RG framework thus advances understanding and enables efficient prediction and design of topologically resilient systems especially via unique Floquet topological phases.
16:15 - 16:30 - Gain-Momentum Locking in Chiral-Gain Systems Oral [Show abstract]
  • João C. Serra, Universidade de Lisboa - Instituto Superior Técnico and Instituto de Telecomunicações, Portugal
  • Nader Engheta, University of Pennsylvania, USA
  • Mário G. Silveirinha, Universidade de Lisboa - Instituto Superior Técnico and Instituto de Telecomunicações, Portugal
Asymmetric light flows in linear systems are typically achieved by breaking time-reversal symmetry. In this work, we discuss how non-Hermitian effects in time-reversal symmetric platforms can lead to nonreciprocal responses driven by chiral-gain. In particular, we prove that truncated chiral-gain media may exhibit a “gain-momentum locking” effect, where waves are amplified or attenuated depending on the direction of propagation.
16:30 - 17:00 - Investigation of THz graphene plasmons with nonlinear effects enhanced by photonic topological surface states Invited oral [Show abstract]
  • Anna Tasolamprou, National anfd Kapodistrian University of Athens, Greece
  • Spyros Doukas, National anfd Kapodistrian University of Athens, Greece
  • Ioannis Katsantonis, Institute of Electronic Structure and Laser, Foundation of Research and Technology Hellas, Greece
  • Thomas Koschny, Ames Laboratory and Department of Physics and Astronomy, Iowa State University, USA
  • Elefterios Lidorikis, Department of Materials Science and Engineering, University of Ioannina, Greece
<p> We investigate third harmonic generation from a graphene-ribbon configuration that supports plasmonic excitations, with efficiency enhanced by a topological cavity. The cavity consists of two adjacent regions of photonic multilayers, with the device operating in both reflection and transmission mode. To explore the nonlinear features, we use a self-consistent multiphysics simulation framework that models graphene’s nonlinear response to THz photoexcitation via the coupled opto-thermal treatment of its thermodynamic response.</p>
17:00 - 17:15 - Large Gap Chern Numbers in Electromagnetic Continua Oral [Show abstract]
  • Guilherme Fonseca, Instituto de Telecomunicações - Instituto Superior Técnico, Portugal
  • Filipa Prudêncio, Instituto de Telecomunicações and Instituto Universitário de Lisboa, Portugal
  • Paloma Huidobro, Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center - Universidad Autónoma de Madrid and Instituto de Telecomunicações, Spain
  • Mário Silveirinha, Instituto de Telecomunicações - Instituto Superior Técnico, Portugal
In this work, we explore nonreciprocal electromagnetic continua that exhibit large gap Chern numbers. We demonstrate that these topological phases can emerge naturally as a result of competing nonlocal effects. To illustrate this phenomenon, we analyze a two-carrier plasma subjected to a static magnetic field. To accurately model the interaction between the carriers and the electromagnetic field, we consider two distinct nonlocal mechanisms. Using a first-principles approach, we numerically compute these topological invariants and establish a connection between the different topological phases and the emerging Weyl points.
17:15 - 17:30 - Non-Abelian Geometric Phases for Polarization Control in Metallic Waveguides Oral [Show abstract]
  • Rodrigo Câmara, University of Lisbon and Instituto de Telecomunicações, Portugal
  • Andrea Alù, Advanced Science Research Center and Graduate Center, City University of New York, USA
  • Mário Silveirinha, University of Lisbon and Instituto de Telecomunicações, Portugal
We develop a general theory for polarization control in adiabatically-deformed metallic waveguides with a doubly degenerate fundamental mode. Our key finding is that non-Abelian Berry connections enable full polarization control, allowing any input polarization state to be transformed into an arbitrary output polarization state.
17:30 - 18:00 - Photonic Axion Insulator Invited oral [Show abstract]
  • Baile Zhang, Nanyang Technological University, Singapore
While still not observed as elementary particles, axions can exist as quasiparticles in topological crystals, whose quantized axion field can induce half Chern numbers on the surfaces of a three-dimensional crystal. We will discuss how to construct an axion insulator in a photonic crystal and demonstrate its unique topological properties.
16:00 - Quantum Materials and Light Emission

Session chairperson(s): Nahid Talebi; Said Rahimzadeh Kalaleh Rodriguez

16:00 - 16:30 - Light Manipulation with Atomically-thin Metasurfaces Invited oral [Show abstract]
  • Mark Brongersma, Stanford University, USA
In this presentation, I will highlight recent efforts in our group to push the limits in scaling of metasurface optics to the ultimate limit of single monolayers of material. In this extreme limit, it is key to harness optical materials resonances as opposed to the commonly-used geometric plasmon and Mie-type resonances that are supported by metal and semiconductor nanostructures. To enable their effective operation at room temperature, we are on a mission to develop an understanding of the relevant solid-state physics and nanophotonics concepts.
16:30 - 16:45 - Designing Quantum Metamaterials in Waveguide QED via Physics-Informed Gradient- Descent Methods Oral [Show abstract]
  • Matthew Belzer, University of Rochester, USA
  • Michele Cotrufo, University of Rochester, USA
Designing multi-atom quantum metamaterials is challenging due to the exponentially increasing Hilbert space's size. We propose and demonstrate a physics-informed gradient-descent method to optimize 1D quantum metamaterials consisting of N atoms in a waveguide. As an example, we show a system of N=4 atoms optimized to induce few-photon nonreciprocal responses much larger than what previously thought.
16:45 - 17:00 - Quantum emitter interacting with a dispersive dielectric object: a model based on the modified Langevin noise formalism Oral [Show abstract]
  • Carlo Forestiere, University of Naples Federico II, Italy
  • Giovanni Miano, University of Naples Federico II, Italy
  • Loris Maria Cangemi, University of Naples Federico II, Italy
We model the interaction of a quantum emitter with a finite-size dispersive dielectric object in unbounded space within the framework of macroscopic quantum electrodynamics, using the modified Langevin noise formalism. We show that the emitter couples to two distinct bosonic reservoirs: a medium-assisted reservoir and a scattering-assisted reservoir, each characterized by its own spectral density.
17:00 - 17:15 - High-Dimensional Arbitrary Spin-Orbital Quantum Light Sources Oral [Show abstract]
  • Yinhui Kan, University of Southern Denmark , Denmark
  • Xujing Liu, University of Southern Denmark , Denmark
  • Sergey Bozhevolnyi, University of Southern Denmark , Denmark
We propose a general strategy to design high-dimensional spin-orbital single-photon sources by taking full advantage of the spatial freedom to design quantum emitters (QEs) -coupled composite (i.e., Moiré/multipart) metasurfaces. We demonstrate the generation of arbitrary vectorial spin-orbital photon emission in high-dimensional Hilbert spaces, mapping the generated states on hybrid-order Bloch spheres. We further realize single-photon sources of high-dimensional spin-orbital quantum emission and experimentally verify polarization entanglement of high-dimensional superposition states with high fidelity. We believe that the results obtained facilitate further progress in integrated solutions for the deployment of next-generation high-capacity quantum information technologies.
17:15 - 17:30 - On-Chip Orbital Angular Momentum Photon Sources via Integration of Quantum Emitters in Metasurface-Decorated Waveguides Oral [Show abstract]
  • Tianshuo Lyu, Harbin Engineering University, China
  • Shailesh Kumar, University of Southern Denmark, Denmark
  • Soeren Sande, University of Southern Denmark, Denmark
  • Chao Meng, University of Southern Denmark, Denmark
  • Xujing Liu, University of Southern Denmark, Denmark
  • Yinhui Kan, University of Southern Denmark, Denmark
  • Vladimir Zenin, University of Southern Denmark, Denmark
  • Torgom Yezekyan, University of Southern Denmark, Denmark
  • Maosen Chen, Harbin Engineering University, China
  • Jinhui Shi, Harbin Engineering University, China
  • Chunying Guan, Harbin Engineering University, China
  • Sergey Bozhevolnyi, University of Southern Denmark, Denmark
  • Fei Ding, University of Southern Denmark, Denmark
We experimentally demonstrate a chip-scale orbital angular momentum (OAM) photon source by embedding a deterministic quantum emitter (QE) within a dielectric waveguide that is integrated with a metasurface grating outcoupler. Upon excitation, the QE’s emission propagates along the waveguide to the metasurface grating outcoupler, which efficiently facilitates the generation of high-purity OAM modes across a broadband spectrum between 650 to 690 nm.
17:30 - 18:00 - Nanoscale Molecular and Ionic Diffusion for Reconfigurable Quantum Materials Invited oral [Show abstract]
  • yohannes abate, The University of Georgia, USA
Interaction with diffusion-driven ions or molecules could enable reconfigurable quantum materials, giving rise to a range of intriguing phenomena, including surface, subsurface, and interface modifications, as well as changes in electronic, optical, and chemical properties. However, understanding the action of molecular and ionic diffusion at the nanoscale presents a formidable challenge in unraveling the fundamental mechanisms involved.
18:00 - 19:30 - Welcome Reception
2 September 2025 / Start time: 9 h 0 min
09:00 - 10:00 - Plenary Session II
09:00 - Plenary Session II

Session chairperson(s): Humeyra Caglayan

09:00 - 10:00 - Coherent Harmonic Light Sources for Advanced Materials Metrologies Plenary [Show abstract]
  • Margaret Murnane, University of Colorado, USA
Next-generation metamaterial, nano and quantum devices have increasingly complex 3D structure. As their dimensions shrink, their performance is often governed by structure and interface quality or the precise chemical, interfacial or dopant composition. However, directly probing such properties at high spatial and temporal resolution is challenging. High harmonic upconversion of femtosecond lasers provides an exquisite source of short wavelength light, with unprecedented control over the spectral, temporal, polarization and orbital angular momentum (OAM) of the emitted waveforms, from the UV to the keV photon energy region. These advances are providing powerful new tools for near-perfect (diffraction limited) functional imaging of soft and hard nanostructured materials, and for engineering the illumination to achieve high-fidelity imaging. In my talk, I will discuss collaborative work using EUV scatterometry and imaging for nondestructive characterization of industry-relevant samples that demonstrate unique capabilities in this new light source.
10:00 - 10:30 - Coffee Break (Tuesday Morning)
10:30 - 12:30 - Oral Sessions (Tuesday Morning)
10:30 - Special session: Metamaterials and Robotics 1

Organizer(s): Benjamin Gorissen

Session chairperson(s): Benjamin Gorissen; Daniela Kraft

10:30 - 11:00 - Metafluids: Incorporating Functionality in a Fluid Invited oral [Show abstract]
  • Benjamin Gorissen, KU Leuven, Belgium
Inspired by mechanical metamaterials, liquids can exhibit programmable mechanical properties when embedded with gas-filled elastic capsules. Under compression, the localized buckling of these capsules induces a radically different macroscopic response in the fluid, which can be precisely tuned through the geometrical parameters of the unit cells and their spatial distribution. We demonstrate the fabrication of such fluids using microfluidic techniques and explore their application in robotic systems, where the fluid's material properties inherently encode programmable behavior.
11:00 - 11:30 - Shape and Flow: Waves in Metamaterials induced by Geometric Frustrations and Fluidic Actuation Invited oral [Show abstract]
  • Eleonora Tubaldi, University of Maryland, College Park, USA
Mechanical multistable metamaterials (MMMs) will be discussed demonstrating that geometric frustration can be harnessed to trigger and sustain the propagation of transition waves. Moreover, fluidic actuation will be introduced to initiate and control the propagation of wavefronts in MMMs.
11:30 - 12:00 - Mechanical Instabilities in Flexible Mechanical Metamaterials Across Scales Invited oral [Show abstract]
  • Aniket Pal, University of Stuttgart, Germany
Mechanical instabilities, in the form of bifurcation buckling and snap-through motion in multistable mechanisms, have attracted a lot of interest as a mode of improving the capabilities and increasing the functionalities of soft systems. Using mechanisms which display mechanical instabilities as the unit cell of a repeating architecture allows us to harness the synergy of periodicity and achieve interesting global responses of the mechanical metamaterial. We look at different mechanical metamaterials, from the centimeter to the micrometer scale, all of which exploit instabilities in their architecture to achieve their functionalities. Starting at the macro scale, we look at how external fields can be used to dynamically program the responses of the instabilities and allows us to achieve reprogrammable devices for mechanical computation. We also look at establishing a rational design strategy for bringing together multiple heterogeneous mechanical computing elements to develop a system level computation architecture. Finally, moving to the micro scale, we utilize the reversible, thermal volumetric shrinking of hydrogels to achieve buckling based transformation of micro-metastructures, and find their use in information encryption.
12:00 - 12:30 - Odd active solids Invited oral [Show abstract]
  • Anton Souslov, University of Cambridge, United Kingdom
Active solids consume energy to allow for actuation and shape change not possible in equilibrium. I will focus on novel phenomena and design principles for active materials with so-called odd elastic moduli, which are composed of non-reciprocal springs. Our results point to the design of novel soft machines at the macroscale, and guide the miniaturization of non-reciprocal metamaterials to the colloidal scale.
10:30 - Metasurface-Enhanced Scattering and Radiation

Session chairperson(s): Mirko Barbuto; Giacomo Oliveri

10:30 - 11:00 - Alternating Projections Method for Metasurface Antennas Synthesis Invited oral [Show abstract]
  • Marco Faenzi, University of Siena, Italy
  • David Gonzalez-Ovejero, University of Rennes, France
  • Enrica Martini, University of Siena, Italy
  • Stefano Maci, University of Siena , Italy
<p> Metasurface (MTS) antennas play a significant role in a variety of operative contexts and environments. The applications range from space communications systems, to terrestrial wireless links for next generations networks and smart radio environments. Modulated MTS antennas, which rely on the conversion from surface waves (SWs) to leaky waves (LWs), have emerged as particularly attractive due to their low profile, simple feeding mechanism, absence of a beam-forming network, independence from application-specific constraints, and their inherent ability to achieve demanding radiation performance. This work addresses the inverse design of metasurface antennas through a physically consistent synthesis of tensorial surface reactance profiles. The method relies on solving the Electric Field Integral Equation (EFIE) via the Method of Moments (MoM), assuming an anti-Hermitian tensor surface reactance to ensure passive and reciprocal implementation. A key challenge in this context is recovering a finite-aperture current distribution that radiates a given far-field pattern, i.e. generates a given spectrum over the visible region, despite the inherent ambiguity due to the unspecified spectral content outside this region. We propose an iterative synthesis strategy inspired by the Gerchberg–Papoulis alternating projection method to reconstruct the missing spectral content of the current, while enforcing both spatial confinement and physical realizability of the impedance. The resulting synthesis process operates directly in the EFIE framework, enabling consistent updates of the current and the impedance profile at each step. The method is implemented using subdomain Gaussian ring basis functions, which provide localized radial resolution and enable efficient analytical evaluation of the MoM matrices entries. The resulting algorithm is therefore extraordinarily fast. Several examples, including single and multiple source configurations, demonstrate the effectiveness of the proposed strategy in producing complex and highly directive far-field patterns.</p>
11:00 - 11:15 - Equivalent Circuit Analysis Of Position-Dependent Surface Wave Coupling Efficiency In Metasurfaces Oral [Show abstract]
  • Joshua Barrass, University of Birmingham, United Kingdom
  • Miguel Navarro-Cía, University of Birmingham, United Kingdom
  • Costas Constantinou, University of Birmingham, United Kingdom
Efficient application of metasurfaces as surface waveguides depends on a well-designed launcher to maximise the in- and out-coupling. By considering the case of a square patch unit cell and an aperture surface wave launcher, we build up a procedure to analyse the interactions between a launcher and a metasurface through equivalent circuit models. This analysis identifies that the coupling efficiency depends on the position of the launcher due to the interactions between the launcher and the small-scale structures of the metasurface.
11:15 - 11:30 - Enhancing Drone Detectability with Genetically Designed Metamaterials Oral [Show abstract]
  • Dmytro Vovchuk, Riga Technical University, Latvia
  • Dmitry Dobrykh, Tel Aviv University, Israel
  • Konstantin Grotov, Tel Aviv University, Israel
  • Anna Mikhailovskaya, Tel Aviv University, Israel
  • Vladyslav Tkach, Riga Technical University, Latvia
  • Mykola Khobzei, Riga Technical University, Latvia
  • Anton Kharchevskii, Tel Aviv University, Israel
  • Vjaceslavs Bobrovs, Riga Technical University, Latvia
  • Pavel Ginzburg, Tel Aviv University, Israel
The rapid expansion of drone applications in areas such as delivery and monitoring has led to increased air traffic, requiring effective navigation and control. A key emerging challenge is the detection of small drones with low radar cross-sections (RCS), comparable to birds, particularly under heavy clutter conditions and low flight altitudes. To address this challenge, we propose equipping drones with superscatterers, dramatically enhancing their RCS. We introduce the concept of evolutionarily designed metamaterials in the form of multilayer stack arrays of strongly coupled electric and magnetic resonators. These structures enable broadband end-fire backscattering, achieving an RCS of approximately 1 m² at 10 GHz, representing a three-order-of-magnitude improvement over a small drone. Despite their compact footprint, the superscatterer provides a fractional bandwidth exceeding 10%, meeting essential radar requirements for high-range resolution. As for the application, we have demonstrated a 1.5- to 5-fold enhancement in detection range using a DJI Mini 2drone tagged with genetically designed volumetric metastructures.
11:30 - 11:45 - Scattering from cylindrical scatterers of time-modulated permittivity Oral [Show abstract]
  • Jiaruo Yan, Foundation for Research and Technology-Hellas, Greece
  • Ioannis Katsantonis, Foundation for Research and Technology-Hellas, Greece
  • Mohamed Mostafa, Aalto University, Finland
  • Viktar Asadchy, Aalto University, Finland
  • Maria Kafesaki, Foundation for Research and Technology-Hellas, Greece
Dielectric particles of time-varying electromagnetic properties exhibit intriguing scattering phenomena. In this work, employing Floquet-Mie theory, we investigate the scattering properties of an infinitely-long cylinder with periodically time-modulated non-dispersive permittivity. Our results indicate parametric scattering amplification may be realized when the modulation strength and frequency meet certain conditions.
11:45 - 12:00 - Scattering of Cylinders with Surface Impedance Multilayers: The Richmond-Mie Theory Oral [Show abstract]
  • Giuseppe Labate, TNO - Radar Department, Netherlands
  • Cristina Yepes, TNO - Radar Department, Netherlands
  • Stefania Monni, TNO - Radar Department, Netherlands
  • Bastiaan Florijn, TNO - Electromagnetic Signature and Propagation Department, Netherlands
  • Giampiero Gerini, TNO - Optics Department, Netherlands
A generalization of the recursive method developed in 1965 by Richmond for dielectric cylindrical multilayer structures is proposed in this paper. Inspired by the mantle cloaking technique, developed in 2009, we extend the Richmond formulation to include multiple boundary conditions with impedance metasurfaces. This method is computationally very efficient and it allows reduced time cost optimizations. All the results presented in the paper have been numerically validated through independent full-wave simulations.
12:00 - 12:15 - Efficient Design of Metasurface with Independent Amplitude and Phase Modulation via Microwave Network Theory Oral [Show abstract]
  • Yingjuan Lu, Southeast University, China
  • HuiDong Li, Southeast University, China
  • JunYan Dai, Southeast University, China
  • JiaNan Zhang, Southeast University, China
  • Qiang Cheng, Southeast University, China
Metasurfaces play a crucial role in wireless communications and radar stealth due to their ability to manipulate electromagnetic (EM) waves. However, achieving independent control of amplitude and phase remains challenging. To address this, multiport microwave network theory and neural networks have been combined to predict multistate EM responses of the RIS unit, accelerating multifunctional unit design. In this work, we extend this approach to design a novel unit operating at 5.57–5.61 GHz with 1-bit amplitude and 2-bit phase modulation, demonstrating its adaptability for advanced RIS structures.
12:15 - 12:30 - Beam-steering Solution from Twisted Bilayer Photonic Crystals Oral [Show abstract]
  • Roy Nicolas, University of Namur, Belgium
  • Beicheng Lou, Stanford University, USA
  • Shanhui Fan, Stanford University, USA
  • Alexandre Mayer, University of Namur, Belgium
  • Michaëll Lobet, University of Namur, Belgium
Our study designs twisted bilayer photonic crystals for beam steering. The device efficiently redirects light into a single order, controlled by the twist angle. We derive an analytical model to show that it mainly functions as a blazed diffraction grating. Heuristic optimization achieved over 90% efficiency for twist angles from 0 to 30 degrees.
10:30 - Time-Varying Media: Resonances and Dispersion

Session chairperson(s): Vladimir Shalaev; Mario Silveirinha

10:30 - 11:00 - Exploiting Resonances in Spatio-Temporal Metamaterials Invited oral [Show abstract]
  • Carsten Rockstuhl, Karlsruhe Institute of Technology, Germany
  • Puneet Garg, Karlsruhe Institute of Technology, Germany
  • Jan David Fischbach, Karlsruhe Institute of Technology, Germany
  • Markus Nyman, Karlsruhe Institute of Technology, Germany
  • Mohammad Sajjad Mirmoosa, University of Eastern Finland, Finland
  • Evangelos Almpanis, NCSR “Demokritos”, Greece
  • Nikos Stefanou, National and Kapodistrian University of Athens, Greece
  • Nikos Papanikolaou, NCSR “Demokritos”, Greece
  • Xuchen Wang, Harbin Engineering University, China
  • Viktar Asadchy, Aalto University, Germany
Spatio-temporal metamaterials offer unique control over the directional and spectral flow of light. We outline a theoretical and computational framework to study these materials from scattering constituents, highlighting how spatial resonances strongly enhance temporal effects.
11:00 - 11:15 - Unconventional Phenomena from Space-Time Modulation of Dispersive Media Oral [Show abstract]
  • Alessandra Contestabile, University of L’Aquila, Department of Physical and Chemical Sciences, Italy
  • Maria Antonietta Vincenti, University of Brescia, Department of Information Engineering, Italy
  • Giuseppe Castaldi, University of Sannio, Department of Engineering, Fields & Waves Lab, Italy
  • Michael Scalora, viation and Missile Center, U.S. Army CCDC, Redstone Arsenal, Alabama, USA
  • Vincenzo Galdi, University of Sannio, Department of Engineering, Fields & Waves Lab, Italy
  • Carlo Rizza, University of L’Aquila, Department of Physical and Chemical Sciences, Italy
We investigate wave scattering from a temporally changing interface, which exhibits Lorentz-type dispersion with a sudden shift in its parameters. Our research brings to light a novel mechanism: the unconventional generation of frequencies at the system’s natural resonances. This effect facilitates the coupling of traveling waves with evanescent waves, enabling the direct excitation of surface-wave modes in the far field, without the need for spatial structures. These findings propose a new approach for compact, high-speed photonic devices,eliminating the need for spatial patterning or extended temporal modulation.
11:15 - 11:30 - Scattering Of Light From A Dispersive And Time-Varying Slab Oral [Show abstract]
  • Jaime Echave-Sustaeta Osuna, Universidad Autónoma de Madrid, Spain
  • Thomas Francois Allard, Universidad Autónoma de Madrid, Spain
  • Francisco José García-Vidal, Universidad Autónoma de Madrid, Spain
  • Paloma Arroyo-Huidobro, Universidad Autónoma de Madrid, Spain
In a time-varying and dispersive slab, guided modes interact with its negative frequency replicas, which results in band-anticrossing and the opening of gaps. This dramatically enhances the inelastic excitation of frequencies and can make the guided modes radiate to the far-field.
11:30 - 11:45 - Dipole Radiation in a Dispersive and Lossy Photonic Time Crystal Oral [Show abstract]
  • Thomas F. Allard, Universidad Autónoma de Madrid, Spain
  • Jaime E. Sustaeta-Osuna, Universidad Autónoma de Madrid, Spain
  • Francisco J. García-Vidal, Universidad Autónoma de Madrid, Spain
  • Paloma A. Huidobro, Universidad Autónoma de Madrid, Spain
We investigate the dissipated power of a point-dipole embedded in a dispersive and lossy photonic time crystal. We uncover specific effects enabled by such dispersion and losses, such as a large frequency window presenting negative dissipated power only.
11:45 - 12:00 - Dynamics of Surface Plasmon Polaritons with Temporal Interface in Metal Oral [Show abstract]
  • Diego Martinez Solis, University of Vigo, Spain
  • Grigorii Ptitcyn, University of Pennsylvania, USA
  • Asma Fallah, University of Pennsylvania, USA
  • Victor Pacheco Peña, Newcastle University, UK
  • Mohammad Mirmoosa, University of Eastern Finland, Finland
  • Nader Engheta, University of Pennsylvania, USA
We study, with two different polarization models, the scattered and confined electromagnetic modes at the spatial interface of an air/metal half-space scenario—initially sustaining a surface plasmon polariton (SPP)—when the plasma frequency in metal is temporally switched to zero, thus producing a time interface in the metallic region.
12:00 - 12:30 - Seeing through a temporally turbid medium Invited oral [Show abstract]
  • Simon Horsley, University of Exeter, United Kingdom
  • Ian Hooper, University of Exeter, United Kingdom
  • David Phillips, University of Exeter, United Kingdom
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Wavefront shaping to control the transmission and reflection of light incident onto complex media is a well-established field, with applications in biomedical imaging via the ability to focus deep into scattering media.  Here, we undertake the temporal equivalent, giving an experimental demonstration of the operator theory of dispersive time varying materials.  We experimentally demonstrate enhanced and diminished reflection through sending in the singular vectors of the measured reflection operator of a time varying medium, in addition to the eigenpulses - specially shaped incident waves that maintain the same spectrum after interaction with the medium.

10:30 - Scattering Particles, Arrays, and Metasurfaces

Session chairperson(s): Iñigo Liberal; Uriel Levy

10:30 - 11:00 - Perfect Absorption, Extinction and Amplification by Resonant Arrays and Single Scatterers Invited oral [Show abstract]
  • Femius Koenderink, AMOLF, Netherlands
We discuss singular scattering responses in two scenarios. The first concerns Salisbury screens with gain and loss. We predict that introducing gain in Salisbury screens with loss can induce both perfect absorption and amplification conditions. The second scenario concerns scattering by finite scattering systems down to the single scatterer level. We analyze maximum extinction in experiments by high-NA scatterometry and wavefront shaping.
11:00 - 11:15 - Angle-Invariant Scattering in Metasurfaces Oral [Show abstract]
  • Mustafa Yucel, EPFL, Switzerland
  • Francisco Cuesta, EPFL, Switzerland
  • Karim Achouri, EPFL, Switzerland
<p> Metasurfaces shape electromagnetic waves but face angular dispersion challenges. Using GSTCs, we derive conditions for angle-invariant scattering, showing how nonlocality and pseudochirality suppress dispersion, enabling stable, angle-independent transmission and reflection — essential for precision, dispersion-sensitive electromagnetic applications.</p>
11:15 - 11:30 - Impact of Finite Size Effects on the Response of Ultracompact Non-Local Metasurfaces Oral [Show abstract]
  • Tom Hoekstra, University of Amsterdam, Netherlands
  • Sander Mann, University of Amsterdam, Netherlands
  • Jorik van de Groep, University of Amsterdam, Netherlands
Finite-size effects prevent achieving high Q-factors in non-local metasurfaces. Here, we experimentally probe the impact of finite size on the Q-factor of a metasurface supporting guided-mode resonances. Additionally, we observe pronounced size-dependent interference patterns in the dispersion and use an analytical model to describe them.
11:30 - 11:45 - Generalized Epsilon-Near-Zero Polaritons in Uniaxial Metasurfaces Oral [Show abstract]
  • Francisco Javier Alfaro Mozaz, Universidad Pública de Navarra, Spain
  • Iñigo Liberal, Universidad Pública de Navarra, Spain
We demonstrate epsilon-near-zero (ENZ) polaritons in ultrathin uniaxial SiC metasurfaces, uncovering previously unreported ENZ modes: open isofrequency curves in all-metallic permittivity regions and closed curves in hyperbolic regions. These findings reveal novel topological transitions that redefine anisotropic polaritonics and enhance control of wave propagation.
11:45 - 12:00 - Exploiting disordered hyperspectral uniformity for nanophotonic light trapping in ultra-thin c-Si solar cells Oral [Show abstract]
  • Alexander Lambertz, AMOLF / UvA Amsterdam, Netherlands
We develop nanophotonic light-trapping layers for weakly absorbing substrates to enable substantial material reduction by exploiting hyperspectral uniformity. With our method we demonstrated record-breaking 65% sunlight absorption in a single pass through just 1 micron of silicon and a 5-micron-thin c-Si solar cell reaching beyond 16% efficiency.
12:00 - 12:15 - Plasmonic Mode Coupling in Multilayer Honeycomb Lattices of Ag Nanotriangles and Nanoholes Oral [Show abstract]
  • Paul-Gregor Nitsch, Brandenburg University of Technology Cottbus-Senftenberg, Germany
  • Paul Oleynik, Brandenburg University of Technology Cottbus-Senftenberg, Germany
  • Markus Ratzke, Brandenburg University of Technology Cottbus-Senftenberg, Germany
  • David Stolarek, IHP - Leibniz Institut für innovative Mikroelektronik, Germany
  • Jon Schlipf, IHP - Leibniz Institut für innovative Mikroelektronik, Germany
  • Oliver Skibitzki, IHP - Leibniz Institut für innovative Mikroelektronik, Germany
  • Christian Wenger, IHP - Leibniz Institut für innovative Mikroelektronik, Germany
  • Inga Anita Fischer, Brandenburg University of Technology Cottbus-Senftenberg, Germany
Coupled lattices of metal nanoparticle and nanohole arrays can support collective plasmonic resonances. Here, we investigate coupled resonances in honeycomb lattices of Ag nanotriangles and nanoholes. Our results indicate that, in these structures, a variation in angle of incidence can be used to tune mode coupling and we discuss implications for applications.
12:15 - 12:30 - Attosecond Electron Pulse Trains Generated by Transverse Polarized Optical Metasurfaces Oral [Show abstract]
  • Tomas Chlouba, NWO AMOLF, Netherlands
  • Nika van Nielen, NWO AMOLF, Netherlands
  • Matthias Liebtrau, NWO AMOLF, Netherlands
  • Albert Polman, NWO AMOLF, Netherlands
We show a two-stage on-chip metasurface device concept to generate and characterize attosecond electron pulses in the scanning electron microscope. By exploiting transverse components of an optical wave exciting a periodic Si metasurface we spatially filter 10 keV electrons with well-defined phase corresponding to a selected sub-cycle window.
10:30 - Electromagnetics of Complex Periodic Structures

Session chairperson(s): Maria Kafesaki; Natalia Litchinitser

10:30 - 11:00 - Quasi-normal mode perturbation theory to achieve Q-factor optimization of resonances in ordered and disordered photonic materials Invited oral [Show abstract]
  • Nicoletta Granchi, Department of Physics and Astronomy and LENS, University of Florence, Italy
  • Matteo Lodde, Eindhoven University of Technology, The Netherlands
  • Andrea Fiore, Eindhoven University of Technology, The Netherlands
  • Marian Florescu, University of Southampton, United Kingdom
  • Pedro David Garcia, Instituto de Ciencia de Materiales de Madrid, Spain
  • Massimo Gurioli, Department of Physics and Astronomy, University of Florence, Italy
  • Francesca Intonti, Department of Physics and Astronomy and LENS, University of Florence, Italy
  • Guillermo Arregui, Swiss Federal Institute of Technology Lausanne, EPFL, Switzerland
We propose a gradient-based automated optimization approach to maximize the quality factor of optical resonances in ordered and disordered dielectric slabs which uses first-order non-hermitian perturbation theory. Preliminary experimental results conducted by means of near-field spectroscopy have revealed fascinating and unexpected features of small-footprint photonic cavities optimized with our method.
11:00 - 11:15 - Efficient All-Dielectric Terahertz Metagrating with the Higher-Order Polarizability Oral [Show abstract]
  • Shuang Peng, State Key Laboratory of Millimeter Wave, Southeast University, China
  • Liwei Yan, State Key Laboratory of Millimeter Wave, Southeast University, China
  • Jie Ma, State Key Laboratory of Millimeter Wave, Southeast University, China
  • Zhanyi Fu, State Key Laboratory of Millimeter Wave, Southeast University, China
  • Fei Yang, State Key Laboratory of Millimeter Wave, Southeast University, China
In this work, we propose a novel high-resistivity silicon-based all-dielectric metagrating for high-efficiency anomalous refraction of terahertz waves. The scattering characteristics of the metagrating unit are precisely engineered by exciting multipoles up to octupoles. A four-silicon-pillar metagrating achieves a peak diffraction efficiency of 91% by directing terahertz waves into the -1st transmission order. With broadband and wide-angle performance, the design maintains diffraction efficiencies above 60% across a 15% relative bandwidth and over a 63° range of incident angles. Compatible with silicon micromachining processes, this metagrating paves the way for developing compact and efficient terahertz devices for applications in radar, imaging, and communication systems.
11:15 - 11:30 - Reflective metasurfaces for simultaneous control of polarizations and reflection angles based on extended Babinet's relations Oral [Show abstract]
  • Takayoshi Fujikawa, Kyoto University, Japan
  • Toshihiro Nakanishi, Kyoto University, Japan
We propose a method to extend Babinet's relations to reflective metasurfaces under specific conditions and demonstrate simultaneous implementation of polarization control and anomalous reflection by the reflective metasurfaces embedding self-complementary structures introducing the phase gradients.
11:30 - 11:45 - Direct Laser Writing of Novel Superimposed Gratings for Structural Colour Oral [Show abstract]
  • Jamie Somers, Trinity College Dublin, Ireland
  • Jing Qian, Trinity College Dublin, Ireland
  • Colm Delaney, Trinity College Dublin, Ireland
  • Pascal Landais , Dublin City University, Ireland
  • Louise Bradley , Trinity College Dublin, Ireland
High resolution superimposed gratings for structural colour have been fabricated using direct laser writing via two photon lithography. A single period of the grating consists of five pillars of three different heights. The superimposed grating design provides a single peak transmittance tunable across the visible spectral range.
11:45 - 12:00 - Controlling Large-Area Optical Field Enhancement in Photonic Landau Levels by Tailoring Synthetic Strain in Photonic Crystals Oral [Show abstract]
  • Daniel Muis, Delft University of Technology, AMOLF, The Netherlands
  • Xiaozhou Wu, AMOLF, The Netherlands
  • René Barczyk, AMOLF, The Netherlands
  • L. Kuipers, Delft University of Technology, The Netherlands
  • Ewold Verhagen, AMOLF, The Netherlands
We study the effect of various types of synthetic strain on light confinement in two-dimensional silicon photonic crystals. Applying crystal strain allows generating photonic Landau levels that form flat bands with low loss and high degeneracy. We tailor the properties of optical fields through strain engineering to maximize field enhancement.
12:00 - 12:15 - Realization of Topological Photonic Structures Made from Multilayer Transition Metal Dichalcogenides Oral [Show abstract]
  • Tommi Isoniemi, University of Sheffield, United Kingdom
  • Paul Bouteyre, University of Sheffield, United Kingdom
  • Xuerong Hu, University of Sheffield, United Kingdom
  • Fedor Benimetskiy, University of Sheffield, United Kingdom
  • Yue Wang, University of York, United Kingdom
  • Maurice S. Skolnick, University of Sheffield, United Kingdom
  • Dmitry N. Krizhanovskii, University of Sheffield, United Kingdom
  • Alexander I. Tartakovskii, University of Sheffield, United Kingdom
In addition to single and few layer regimes, bulk layers of transition metal dichalcogenides are attractive for high-index and low loss nanophotonic structures. We demonstrate topological spin-Hall lattices in WS2 slab waveguides, with unidirectional photonic interface states in polarization-dependent optical measurements.
12:15 - 12:30 - Gravitational Waves: A Paradigm of Luminal Traveling-Wave Modulations Oral [Show abstract]
  • Stefanos Koufidis, Imperial College London, United Kingdom
  • Martin McCall, Imperial College London, United Kingdom
<p> Co-propagating gravitational and electromagnetic waves can generate sidebands on the forward-scattered light, thereby offering an avenue for detection of gravitational radiation. Employing a covariant coupled-wave approach, we model gravitational waves as dynamic, phase-insensitive ``luminal moving gratings.'' Derived phase-matching conditions elucidate how these waves interact with electromagnetic fields whilst simultaneously conserving energy and momentum. Although detecting low-frequency gravitational waves is hindered by the requirement for long interaction lengths, advances in laser technology are set to enable high-frequency detection, with the potential of unlocking insights into the primordial fabric of spacetime.</p>
12:30 - 14:00 - Lunch break and Poster Session II (Tuesday)
12:30 - Poster session II

Session chairperson(s): Xiaofei Guo

1 - Design of Broadband Radar Absorbing Structure using Two Bitmap-type Frequency Selective Surfaces Poster [Show abstract]
  • Jinbong Kim, Korea Institute of Materials Science, Korea (South)
  • Hong-Kyu Jang, Korea Institute of Materials Science, Korea (South)
  • Jaecheol Oh, Korea Institute of Materials Science, Korea (South)
This study presents an optimized design of a radar absorbing composite structure using two frequency-selective surfaces to achieve a broadband absorption performance in the S, C, X, and Ku-bands. Each frequency-selective surface is coded as a 20 × 20 bitmap matrix.
2 - 300-GHz-band metamaterial-based phase shifting integrated circuit in high-resolution 3D printed waveguide packaging for future wireless communication Poster [Show abstract]
  • Adam Pander, NTT Device Technology Laboratories, NTT Corporation, Japan
  • Kentaro Soeda, The University of Tokyo , Japan
  • Daisuke Kitayama, NTT Device Technology Laboratories, NTT Corporation, Japan
  • Hibiki Kagami, NTT Device Technology Laboratories, NTT Corporation, Japan
  • Hiroshi Hamada, NTT Device Technology Laboratories, NTT Corporation, Japan
  • Yoshinori Yamaguchi, The University of Tokyo , Japan
  • Kuniaki Konishi, The University of Tokyo , Japan
  • Junji Yumoto, The University of Tokyo , Japan
  • Hiroyuki Takahashi, NTT Device Technology Laboratories, NTT Corporation, Japan
Put your abstract hereThis study presents the first-ever phase shifter metamaterial-based devices at 300-GHz-band with continuous 2π phase controllability for future beamforming in wireless networks. To cope with the demand for high-density packaging, fabricated metamaterial chips were mounted in hollow waveguides fabricated using a high-resolution 3D printer (RECILS). The fabricated devices showed over 360° phase control in the response to the applied bias.
3 - Reconfigurable Polarization Deflector in PTD-Symmetric Geometry Poster [Show abstract]
  • Roee Geva, Tel Aviv University, Israel
  • Mário Silveirinha, University of Lisbon, Portugal
  • Rapahel Kastner, Tel Aviv University, Israel
We describe a reconfigurable polarization deflecting device based on the recently reported capability of PTD symmetric structures to achieve polarization inversion. The device can rotate dynamically the mirror plane using controlled capacitors as short or open circuits for allocating near-PEC and near-PMC regions. Simulations verify the viability of the device.
4 - Electromagnetic Wave-Based Quasi-Digital Linear Logic Operations Poster [Show abstract]
  • Ross Glyn Macdonald, Newcastle University, United Kingdom
  • Alex Yakovlev, Newcastle University, United Kingdom
  • Victor Pacheco-Peña, Newcastle University, United Kingdom
The superposition of electromagnetic (EM) waves is exploited to implement quasi-digital logic operations. Different than true digital operations, quasi-digital operations are implemented using entirely linear structures by tailoring the encoding scheme of the input signals and the geometry of the structure.
5 - Broadband multilayer metasurface absorbers with MXene resonators and topology optimized substrates Poster [Show abstract]
  • Maria-Thaleia Passia, Duke University, USA
  • Yilin Zhao, Duke University, USA
  • Haozhe Wang, Duke University, USA
  • Steven Cummer, Duke University, USA
We present the synthesis of broadband multilayer metamaterial absorbers (MMA) based on MXenes, which are novel two-dimensional conductive materials with higher ohmic losses than copper. We examine the possibility of utilizing topology-optimized stereolithography (SLA) 3D-printed substrates as a complementary means for enhancing absorption.
6 - 3D-Printed Optically Transparent Metasurface for Automotive Radar Applications Poster [Show abstract]
  • Sergey Geyman, School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
  • Dmytro Vovchuk, Institute of Telecommunications, Riga Technical University, Riga, Latvia
  • Denis Kolchanov, School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
  • Mykola Khobzei, Institute of Telecommunications, Riga Technical University, Riga, Latvia
  • Vladyslav Tkach, Institute of Telecommunications, Riga Technical University, Riga, Latvia
  • Vjaceslavs Bobrovs, Institute of Telecommunications, Riga Technical University, Riga, Latvia
  • Hagit Gilon, DR Utilight Ltd., Yavne, Israel
  • Eyal Cohen, DR Utilight Ltd., Yavne, Israel
  • Eran Yungar, DR Utilight Ltd., Yavne, Israel
  • Pavel Ginzburg, School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
Radar enhances automotive safety by enabling reliable object detection, crucial for advanced driver assistance systems (ADAS) and autonomous driving. A vehicle's radar cross-section (RCS) determines its visibility, yet modern cars lack embedded radar reflectors due to design constraints. Rear windshields, offering unused space, could host a retroreflective surface designed for the interrogation geometry. We propose a metasurface of thin conductive wires, patterned to satisfy the first Bragg condition. Fabricated using silver-nanoparticle inks, our 10×10 cm² sample achieves 90% optical transparency and an RCS of 8 m², exceeding typical vehicle RCS. Scaling to a full windshield could yield an RCS of 1,000 m², improving detectability nearly hundredfold. Smart transparent surfaces integrating electromagnetic functions open avenues in automotive radar, wireless communication, and IoT.
7 - Dual-frequency cofocus microwave metasurface Poster [Show abstract]
  • Quansheng Zhang, Southeast University, China
  • Di Guo, Southeast University, China
  • Changsheng Shen, Southeast University, China
  • Zhaofu Chen, Southeast University, China
  • Hehong Fan, Southeast University, China
  • Ningfeng Bai, Southeast University, China
This paper introduces a dual-frequency microwave metasurface. The operating frequencies of this metasurface are 110 GHz and 150 GHz. Based on the PB phase, an achromatic metasurface is constructed using a simple and easy-to-process rectangular perforated unit structure. In general, the unit structure of a microwave metasurface is complex and large, and there will be phase differences between metasurfaces of different frequencies. This paper uses an anisotropic dielectric perforated unit structure to construct an achromatic metasurface. The simulation results show that the focus shift of this metasurface can be less than 1 wavelength at dual frequency.
8 - Asymmetric Smith-Purcell Radiation Via Coupled High-Index Gratings Poster [Show abstract]
  • Thomas Delplace, University of Mons, Belgium
  • Ilyes Bouanati, University of Mons, Belgium
  • Gilles Rosolen, University of Mons, Belgium
  • Bjorn Maes, University of Mons, Belgium
In this work, we present a structure consisting of a double photonic crystal with a high-refractive-index substrate. By shifting the two crystals, we induce an asymmetry in the Smith-Purcell radiation between the upper and lower directions. This asymmetry is explained using a semi-analytical model based on Coupled Mode Theory.
9 - Optomechanical Coupling Rate Optimization of Hypersonic Nano-Beams Poster [Show abstract]
  • Omid Reza Ranjbar Naeini, INL, Portugal
  • Jouni Ahopelto, VTT, Finland
  • Clivia M Sotomayor Torres, INL, Portugal
We designed and fabricated an optomechanical resonator to asses dimensional variability. We find that the air hole radius and stub length have to be optimized to increase the optomechanical coupling rate in 2.5 GHz nanobeams. We observed that a 50 nm variation in air hole radius, stub length / stub width altered the total optomechanical coupling rate by 35% and 25%, respectively. To improve optomechanical coupling at 4.5 GHz, a new design is proposed based on the moving boundary effect. This approach significantly increased the total optomechanical coupling rate to approximately 5 MHz.
10 - Optimization Study of Additive Manufactured Terahertz Metamaterial Structures through Modelling and Simulation Study Poster [Show abstract]
  • Ayodya Pradhipta Tenggara, Faculty of Engineering, Universitas Gadjah Mada, Indonesia
Terahertz (THz) resonant metamaterials has become emerging devices for several applications, such as sensing, plasmonic filters, super-resolution imaging, high-sensitive detection, aerocraft stealth and laser-machining. Using the additive manufacturing technologies, such as Drop on Demand (DoD) technique of inkjet pronting, a very small-sized pattern of metamaterials with a line size of ~5 µm width was possible to be constructed on vast area on any kind of substrates (rigid or flexible). However, due to ink materials and process limitations, not all printed metamaterial structures could achieve targeted performance. Here we performed an optimization study to improve the functionality and the sensitivity of potentially drop on demand (DoD) inkjet jet printed THz resonant metamaterial structures in detecting microorganisms. Parametric studies on the effect of the geometry change of the pattern were carried out. Increasing the metal width and decreasing the gap increases the resonant frequency and the Q-factor. The Q-factor does not affect the resonant frequency shift but determines the sensing resolution. The sensitivity is improved by introducing the low-permittivity and low- thickness substrate. As the substrate becomes thinning, the metamaterial sensor sensitivity on a high- permittivity substrate approaches that of the metamaterial sensor on a low-permittivity substrate. For the substrate thicknesses 500, 3, 1, 0.5, and 0.1 μm, the sensitivity improvement of the low-permittivity substrate is 23%, 30%, 58%, 68%, and 98% compared to the high-permittivity substrate.
11 - Tunable Antenna Integrating Highly-Conductive Nanocrystalline Graphite and Meta-atoms for Advanced and Miniaturized Millimetre-wave Radar Applications Poster [Show abstract]
  • Martino Aldrigo, IMT Bucharest, Romania
  • Hardly Joseph Christopher, IMT Bucharest, Romania
  • Catalin Parvulescu, IMT Bucharest, Romania
  • Octavian-Gabriel Simionescu, IMT Bucharest, Romania
  • Sergiu Iordanescu, IMT Bucharest, Romania
  • Stephane Xavier, Thales Research and Technology France, Campus Polytechnique, France
  • Afshin Ziaei, Thales Research and Technology France, Campus Polytechnique, France
This paper proposed the wafer-scale integration of highly-conductive nanocrystalline graphite (NCG) and meta-atoms into 60-GHz antennas fabricated on a 4-in high-resistivity silicon substrate. At the end, a 4-element antenna array is proposed for a practical 60-GHz radar application. Preliminary measurements of both reflection coefficient and transmission prove the advantages of such a solution with respect to the same antenna without meta-atoms, especially in terms of bandwidth. Furthermore, the high fabrication yield and repeatability of the measurement results ensure the future upgrade to mass production.
12 - Designing Isotropic Dark Modes Poster [Show abstract]
  • Kieran Cowan, University of Exeter, United Kingdom
  • Simon Berry, QinetiQ, United Kingdom
  • Alastair Hibbins, University of Exeter, United Kingdom
  • Alex Powell, University of Exeter, United Kingdom
Dark modes do not radiatively couple to the far field at specific incident wave angles. This work explores designing a resonant dimer with a mode that is observed in the near field but not the far field, regardless of incident angle.
13 - Experimental Investigation of Topological Localized States in a 3D Dielectric Bianisotropic Array Poster [Show abstract]
  • Georgii Kurganov, School of Physics and Engineering, ITMO University, Russia
  • Alina Rozenblit, School of Physics and Engineering, ITMO University, Russia
  • Jiangnan Xing, School of Physics and Engineering, ITMO University, Russia
  • Nikita Olekhno, School of Physics and Engineering, ITMO University, Russia
  • Dmitry Zhirihin, School of Physics and Engineering, ITMO University, Russia
Three-dimensional photonic topological systems offer the most complete way of robust light propagation control, while dielectric platforms stand out for the flexible scalability and absence of Ohmic losses. This work experimentally investigates photonic topological edge and interface states in a 3D array of dielectric bianisotropic resonators. The presented near magnetic field maps show that various domain boundaries of the considered structure supports photonic localized states, which could prove useful for future potential applications.
14 - Application of H∞ Approximation Method in Design of Negative Inductance Poster [Show abstract]
  • Dominik Zanic, University of Zagreb, Croatia
  • Silvio Hrabar, University of Zagreb, Croatia
This paper presents a frequency-based method for determining the loading impedance of a two-port dispersive NIC network such that the NIC approximates arbitrary predetermined impedance.
15 - Gyrotropic Metamaterials with Tailored Magnetization Poster [Show abstract]
  • Nazar Pyvovar, University of Texas at San Antonio, USA
  • Sadi Ayhan, University of Texas at San Antonio, USA
  • Carl Pfieffer, Air Force Research Laboratory, USA
  • Igor Anisimov, Air Force Research Laboratory, USA
  • Ilya Vitebskiy, Air Force Research Laboratory, USA
  • Andrey Chabanov, University of Texas at San Antonio, USA
Magnetic materials are crucial in nonreciprocal electromagnetic devices, such as isolators, circulators, and nonreciprocal phase shifters. However, their use is often limited by the need for a uniform bias magnetic field and nonuniform demagnetizing fields, resulting in the restricted aperture of free-space devices, poor temperature stability, and incompatibility with magnetic field-sensitive applications. Here, we introduce a new approach based on self-biased gyrotropic metamaterials composed of magnetically hard magnets embedded in a magnetically soft ferrite matrix. In this configuration, the hard magnets provide the magnetic bias for the ferrite matrix, which produces a nonreciprocal response. This gyrotropic metamaterial can exhibit zero net magnetization while producing strong and uniform Faraday rotation over a broad temperature range. Without bias and demagnetizing fields, the aperture of this Faraday rotator can be virtually unlimited. Using this method, we demonstrate uniform 45-degree Faraday rotation and effective isolation across the microwave X-band.
16 - Design of an Intelligent Metasurface with Independently and Precisely Tunable Amplitude-Phase Control Poster [Show abstract]
  • Jia Chen Wang, Southeast University, China
  • Zhen Jie Qi, Southeast University, China
  • Qun Yan Zhou, Southeast University, China
  • Jun Wei Wu, Southeast University, China
  • Shuo Liu, Southeast University, China
  • Hui Dong Li, Southeast University, China
  • Jun Yan Dai, Southeast University, China
  • Qiang Cheng, Southeast University, China
This paper proposes a metasurface with precise independent amplitude and phase control in the 2–2.5 GHz band, achieving over 10 dB amplitude tuning and 0–360° phase tuning. Full-wave simulations confirm its superior performance for complex electromagnetic wave manipulation.
17 - A 1-bit Amplifying Space-Time-Coding Metasurface Poster [Show abstract]
  • Lijie Wu, Southeast University, China
  • Zheng Xing Wang, Southeast University, China
  • Jun Yan Dai, Southeast University, China
  • Qiang Cheng, Southeast University, China
  • Tie Jun Cui, Southeast University, China
To compensate the energy loss of traditional passive space-time-coding metasurface, an amplifying space-time-coding metasurface (ASTCM) is proposed in this work. The ASTCM can achieve more than 5 dB energy enhancement and over 20 dB dynamic amplitude manipulation with different control voltages of the amplifier chip. Furthermore, a stable 1-bit phase modulation is also realized through two oppositely arranged PIN diodes. For verification, a 6*6 metasurface array is constructed to realize flexible beam control by using different space-time-coding strategies. The proposed ASTCM exhibits amplifying capability and great beamforming performance, which may find critical applications in the field of wireless communication and radar systems.
18 - Reconfigurable Dual-polarized Waveguide-fed Metasurface for 5G Millimeter-wave Communication Poster [Show abstract]
  • Han Zhang, Southeast University, China
  • Shuang Peng, Southeast University, China
  • Qian Yu, Southeast University, China
  • Xiaoyue Shen, Southeast University, China
  • Zhanyi Fu, Southeast University, China
  • Fei Yang, Southeast University, China
A reconfigurable dual-polarized waveguide-fed metasurface (RDWM) for 5G mmWave systems integrates ±45° slotted SIW and PIN diodes, enabling independent ±45° beam steering (<3° error). Experiments validate decoupled control (e.g., +45° at 0° & -45° at 20°), offering a low-profile solution for 5G/6G multi-functional antennas.
19 - Packing a Wire Metamaterial Haloscope into a Cylindrical Footprint Using Spiral Geometry Poster [Show abstract]
  • Rustam Balafendiev, University of Iceland, Iceland
  • Junu Jeong, Stockholm University, Sweden
  • Gagandeep Kaur, Stockholm University, Sweden
  • Gaganpreet Singh, Stockholm University, Sweden
  • Pavel Belov, ITMO University, Russia
  • Jon Gudmundsson, University of Iceland, Iceland
In this work we describe a way to arrange a wire medium inside a plasma haloscope which insures that the boundary of the metamaterial closely follows the walls of a cylindrical microwave cavity, optimizing it for use with a cylindrical-bore magnet. A way of tuning the cavity's resonant frequency by utilizing static and rotating spiral arms is investigated numerically, demonstrating 33% of tuning and 17% of change to the figure of merit throughout the process.
20 - A Frequency Beam-Scanning TMA Without Utilizing Phase Shifters or Complex Feeds Poster [Show abstract]
  • Alireza Ghaneizadeh, Constructor University Bremen, Germany
  • Sören F. Peik, Hochschule Bremen, Germany
  • Martin Schneider, University of Bremen, Germany
  • Mojtaba Joodaki, Constructor University Bremen, Germany
True metasurface antennas (TMAs) have already been introduced as a novel concept for the development of ultra-thin superdense antenna arrays. A shortcoming of the existing TMAs is that they have not been able to provide a passive reconfigurable TMA. In this paper, we design, simulate, and measure a new reconfigurable passive TMA, inspired by dynamic traveling-wave metasurface antenna arrays for beam steering. Such compact passive reconfigurable TMAs are in great demand in 6G networks and other terrestrial communication applications and in today’s spacecraft or space satellites.
21 - Metamaterial-Based Micro-Doppler Enhancement via High-Order Multipole Scattering Poster [Show abstract]
  • Sergey Geyman, School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
  • Dmytro Vovchuk, Institute of Telecommunications, Riga Technical University, Riga, Latvia
  • Konstantin Grotov, School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
  • Dmitry Dobrykh, School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
  • Anton Kharchevskii, School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
  • Vjaceslavs Bobrovs, Institute of Telecommunications, Riga Technical University, Riga, Latvia
  • Pavel Ginzburg, School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
In electromagnetic wave interactions, rotating objects typically induce micro-Doppler frequency shifts governed by the symmetry of their scattering response. Traditional dipolar scattering results in a shift at 2Ω, while higher-order rotational harmonics require engineered scatterers. Here, we introduce a metamaterial-based approach for artificial micro-Doppler enhancement via strongly interacting magneto-electric resonators. These GHz-range structures, optimized through a covariance matrix adaptation genetic algorithm, support high-order multipoles, generating frequency shifts exceeding the dipolar limit by two orders of magnitude. Our designed array effectively maps slow (Hz-range) rotations to the kHz range, significantly boosting micro-Doppler visibility. This enhancement not only advances fundamental studies of wave-matter interactions but also improves radar-based motion detection by elevating micro-Doppler signatures above clutter.
22 - Huygens Metasurfaces Array Synthesis for Azimuth and Elevation Beam Tilt Poster [Show abstract]
  • Michela Longhi, Niccolò Cusano University, Italy
In this contribution, we present a model of a cylindrical Huygens metasurface designed to modify the radiation pattern of an omnidirectional antenna over a wide range of angles. Thanks to the accurate synthesis of the metasurface, it is possible to achieve an advanced control of the electromagnetic properties of the radiation beam, acting simultaneously on both the E-plane and the H-plane. This approach allows to improve the directivity and the configuration of the radiation, making the solution particularly useful in advanced communication, beamforming and interference reduction applications.
23 - Large-scale Programmable Metasurface for Terahertz Beam Scanning Poster [Show abstract]
  • Biao-Bing Jin, Nanjing University, China
In this talk, we presented a large-scale programmable metasurface for terahertz (THz) beam scanning. A pixelated liquid crystal THz metasurface with a crossbar structure arranged in two layers is designed to avoid the complexity of feedline in one layer, and decreased the control lines from N2 to 2N, N is the array number. This made us easily to increase the scale of array number more than 3000. We also demonstrated experimentally the programmable metasurface capable of active beam deflection in the upper half space with theta< 45 degree and 0 < phi<360 degrees. This large-scale metasurface device opens exciting opportunities in pencil beamforming, high-speed information processing, and optical computing.
24 - A Complementary Split Ring Resonator (CSRR) Based Metamaterial Structure for Antenna and Size Reduction Applications Poster [Show abstract]
  • Mohammad Fairouz, PAAET, Kuwait
This paper presents the design and simulation of a Complementary Split Ring Resonator (CSRR)-based metamaterial structure aimed at enhancing antenna performance for wireless communication applications. The CSRR is integrated into a microstrip patch antenna to optimize impedance matching, bandwidth, size and efficiency. Utilizing Rogers RT/duroid 5870 as the substrate, the proposed design ensures low dielectric loss and improved radiation characteristics. The extracted material parameters confirm negative permittivity at resonance, validating the metamaterial behavior. The results indicate that CSRR structures can effectively contribute to antenna miniaturization while maintaining high radiation efficiency, reduce size, making them suitable for modern wireless communication and RF applications.
25 - Characterizing 3D Printed Polymers At Telecommunications Wavelengths For Use In Photonics Poster [Show abstract]
  • Joseph Arnold Riley, Newcastle University, United Kingdom
  • Christian Johnson-Richards, Newcastle University, United Kingdom
  • Ross Glyn Macdonald, Newcastle University, United Kingdom
  • Noel Healy, Newcastle University, United Kingdom
  • Victor Pacheco-Peña, Newcastle University, United Kingdom
In this work we experimentally, theoretically and numerically study the possibility to use 3D printable plastics in photonics. The complex refractive index of the selected plastics is retrieved in the wavelength range of 1520 - 1630 nm. Demonstrating that the chosen materials may have potential uses at Telecom wavelengths.
14:00 - 15:30 - Oral Sessions (Tuesday Afternoon 1)
14:00 - Acoustic Metamaterials

Session chairperson(s): Romain Fleury

14:00 - 14:30 - Bloch Methods for Approximating the Spectra of Quasiperiodic Metamaterials Invited oral [Show abstract]
  • Bryn Davies, University of Warwick, United Kingdom
Quasiperiodic metamaterials hold significant potential to unlock novel phenomena. We present analyses of popular methods to approximate their spectra: the superspace and supercell methods (both approximate the quasicrystal by a periodic geometry). These methods facilitate the systematic design of novel quasiperiodic metamaterials, such as topological waveguides and graded metamaterials (with rainbow effects).
14:30 - 14:45 - Performing Complex-Frequency Plane Analysis of Resonant Sound-Absorbing Structures via Real-Frequency Simulations Oral [Show abstract]
  • Ziqian Xiao, Institute of Acoustics, Chinese Academy of Sciences, China
  • Tuo Liu, Institute of Acoustics, Chinese Academy of Sciences, China
Complex-frequency plane analysis has been a powerful tool for the investigation of open wave systems but usually relies on the theoretical modeling of the scattering matrices. This paper presents a method, compatible with real-frequency solvers, for acoustic complex-frequency calculation and demonstrates its effectiveness in simulating actual resonant sound-absorbing structures.
14:45 - 15:00 - Ventilated Sound Absorption Via Porous Material-Integrated Acoustic Metamaterial Oral [Show abstract]
  • Inkyuk Han, Seoul National University of Science and Technology, Repubilc of Korea
  • Gwanho Yoon, Seoul National University of Science and Technology, Repubilc of Korea
We study numerically and experimentally a ventilated sound absorber that integrates porous material into a metamaterial framework. The design exploits porous cavities as stiffness elements and damping media, achieving absorption coefficients above 0.8 between 384–736 Hz and improved transmission loss, while maintaining effective ventilation.
15:00 - 15:15 - Metasurface-integrated Wide-area Ultrasonic Transducer: A new Platform for Parametric Array Loudspeakers Oral [Show abstract]
  • Beomseok Oh, Pohang University of Science and Technology (POSTECH), Korea (South)
  • Woongji Kim, Pohang University of Science and Technology (POSTECH), Korea (South)
  • Wonkyu Moon, Pohang University of Science and Technology (POSTECH), Korea (South)
  • Junsuk Rho, Pohang University of Science and Technology (POSTECH), Korea (South)
Put your abstract hereIn this work, we propose a new form factor for directional loudspeakers. Our device integrates a wide area piezoelectric transducer with an ultrasonic meatsurface, enabling the generation of highly efficient directional ultrasonic waves. These are employed to induce a nonlinear acoustic phenomenon known as the parametric acoustic array, which is utilized to produce highly directional audible sound.
15:15 - 15:30 - Ultrasonic Fingerprint Identification via Metasurface-Driven Loop-Diffractive Neural Network Oral [Show abstract]
  • Seokho Lee, Pohang university of science and technology(POSTECH), Korea (South)
We propose a memoryless ultrasonic fingerprint identification (MUFI) system that verifies identity without storing biometric data, mitigating security risks. Using a loop-diffractive neural network, it employs only an ultrasonic transducer, a metasurface, and the fingerprint. Experiments achieved 100% numerical accuracy and 97.92% real-world accuracy, ensuring secure biometric authentication.
14:00 - Metasurfaces for Antenna Systems II

Session chairperson(s): Giampiero Gerini; Silvio Hrabar

14:00 - 14:30 - Recent Advances in the Applications of Composite Vortex Theory to Reconfigurable Radiating Structures and Metasurfaces Invited oral [Show abstract]
  • Mirko Barbuto, Roma Tre University, Italy
  • Alessio Monti, Roma Tre University, Italy
  • Stefano Vellucci, Niccolò Cusano University, Italy
  • Andrea Alù, City University of New York, USA
  • Filiberto Bilotti, Roma Tre University, Italy
  • Alessandro Toscano, Roma Tre University, Italy
This contribution presents recent advances in Composite Vortex Theory (CVT), focusing on its application to reconfigurable radiating elements with tunable radiation patterns, beam-steering capabilities, and self-scanning functionalities. Additionally, we explore CVT-based reflective and transmitting metasurfaces designed for dynamic control over the reflected or transmitted field. The theoretical foundations of CVT are discussed alongside numerical validations that highlight its potential in reconfigurable electromagnetic systems.
14:30 - 14:45 - Toward Design of Electrically Large Array of Rectangular Waveguide-fed Metasurfaces Oral [Show abstract]
  • Insang Yoo, Yonsei University, Korea (South)
  • Michael Boyarsky, Duke University, USA
  • David Smith, Duke University, USA
We present the design and analysis of waveguide-fed metasurfaces consisting of an array of rectangular waveguides and metamaterial radiators--electrically small irises--inserted into the top wall, with each rectangular waveguide being excited by a slotted waveguide attached to the bottom wall. The metasurface configuration offers advantages for constructing electrically large aperture antenna systems, necessitating an efficient approach for design and analysis. We propose an analytical model for the metasurface using the coupled dipole framework, which approximates individual radiators as polarizable dipoles and models their mutual interactions using the Green's functions. The proposed model is verified through full-wave simulations and thus demonstrated as an effective method for metasurface design and analysis.
14:45 - 15:00 - Tunable Topological Metasurface with Leaky-wave Features Oral [Show abstract]
  • Vinothan Vaheesan, University of Birmingham, United Kingdom
  • Kevin Mitchell, QinetiQ Group Plc, United Kingdom
  • Daniel Trussler , QinetiQ Group Plc, United Kingdom
  • Miguel Navarro-Cía, University of Birmingham, United Kingdom
  • Alexandros Feresidis, University of Birmingham, United Kingdom
We present a tunable photonic topological metasurface that switches between a guided surface wave and a highly directive leaky wave antenna. Mode shifts in the dispersion diagrams reveal, at 18 GHz, a 5.94% radiation efficiency in guided mode and a 12.42 dB peak directivity in leaky mode.
15:00 - 15:30 - Surface Electromagnetics within the Smart EM Environment - Recent Advances and Future Trends Invited oral [Show abstract]
  • Federico Albi, ELEDIA@UniTN-DICAM, University of Trento, Italy
  • Giorgio Gottardi, ELEDIA@UniTN-DICAM, University of Trento, Italy
  • Aaron Angel Salas Sanchez, ELEDIA@UniTN-DICAM, University of Trento, Italy
  • Francesco Zardi, ELEDIA@UniTN-DICAM, University of Trento, Italy
  • Giacomo Oliveri, ELEDIA@UniTN-DICAM, University of Trento, Italy
The revolutionary Smart Electromagnetic Environment (SEME) concept is transforming wireless system design by enabling control over electromagnetic wave propagation to meet network-defined performance objectives. Among the technologies exploited to implement the SEME vision are Electromagnetic Skins (EMSs), which are passive two-dimensional artificial structures engineered to statically or dynamically manipulate electromagnetic propagation in both indoor and outdoor settings. The enabling feature of EMSs within SEME is related to their advanced wave manipulation functionalities, including anomalous reflection and beam shaping, through meta-atomic adjustments of their electrical properties. Recent advancements have expanded the capabilities of EMSs, introducing innovations such as optically transparent designs for seamless integration into existing infrastructures, and customized design strategies that support inexpensive implementations of EMSs. This work aims to review the recent advancements in EMS engineering for SEME applications, providing insights into cutting-edge design and implementation strategies that are shaping the future of wireless communications.
14:00 - Time-Varying Photonics II

Session chairperson(s): Simon Horsley; Carsten Rockstuhl

14:00 - 14:30 - Quantum Meta-Photonics and Extreme Space-Time Optics Invited oral [Show abstract]
  • Vladimir Shalaev, Purdue University, USA
In this talk we first discuss the integrated quantum photonic circuitry based on the recently discovered single-photon emitters in silicon nitride and the avalanche-enhanced optical modulation in silicon at single-photon intensities. Then, we show that transparent conducting oxides (TCOs) operating in the near-zero index (NZI) regime can provide strong single-cycle modulation, enabling novel phenomena in such extreme time-varying media.
14:30 - 14:45 - Bridging Guided Waves and Non-Diffractive Free Space Waves Oral [Show abstract]
  • Zeki Hayran, Imperial College London, United Kingdom
  • John B. Pendry, Imperial College London, United Kingdom
Waves propagating in free space are inherently subject to diffraction, which limits performance in applications such as imaging and optical communications. To overcome this, non-diffracting beams that maintain their spatial profile over extended distances have been extensively studied. More recently, there has been growing interest in space-time wave packets, in which spatial and temporal degrees of freedom are intrinsically linked, enabling diffraction-free propagation through tailored spectral correlations. However, these efforts have largely focused on free-space configurations, leaving open the question of how guided waves in integrated photonic platforms can be directly converted into non-diffracting beams. Here we explore this challenge and show that applying temporal and/or spatial modulation to a conventional dielectric waveguide enables the controlled generation of space-time light sheets in free space. These beams propagate in free space but inherit the group velocity of the guided mode, enabling a transition from guided to diffraction-free propagation while maintaining a velocity distinct from that of conventional free-space waves. This approach provides a pathway for practical applications, including high-resolution biomedical imaging, free-space links between integrated photonic circuits, and diffraction-free connections within a photonic chip.
14:45 - 15:00 - Topological Nature of Interface States in Space-Time Modulated Metamaterials Oral [Show abstract]
  • Alejandro Caballero, Universidad Autónoma de Madrid, Departamento de Física Teórica de la Materia Condensada (IFIMAC), Spain
  • Thomas Allard, Universidad Autónoma de Madrid, Departamento de Física Teórica de la Materia Condensada (IFIMAC), Spain
  • Paloma Arroyo, Universidad Autónoma de Madrid, Departamento de Física Teórica de la Materia Condensada (IFIMAC), Spain
In this work, we discuss the relevant symmetries in one-dimensional spatio-temporal metamaterials that enable their topological classification. In particular, we demonstrate a quantized Zak phase and the existence of interface states that localize at the spatio-temporal boundary and are robust to perturbations of the surface.
15:00 - 15:15 - Coherent Faraday Effect in Nonlinear Media Oral [Show abstract]
  • Michele Guizzardi, Advanced Science Research Center, City University of New York, USA
  • Sedigheh Esfahani, Advanced Science Research Center, City University of New York, USA
  • Sriram Guddala, Advanced Science Research Center, City University of New York, USA
  • Andrea Alù, Advanced Science Research Center, City University of New York, USA
We propose a magnet-free Faraday effect using nonlinearities in a silicon nitride cavity. Two detuned pump beams create a synthetic angular momentum bias, rotating a probe’s polarization. This phase-matching-free method enables dynamic control, promising compact, nonreciprocal photonic devices.
15:15 - 15:30 - Dynamic Temporal Pulse Shaping with ITO Oral [Show abstract]
  • Joseph Stones, Imperial College London, United Kingdom
  • Anthony Harwood, Imperial College London, United Kingdom
  • Stefano Vezzoli, Imperial College London, United Kingdom
  • Riccardo Sapienza, Imperial College London, United Kingdom
<p> This contribution presents the experimental advancements in testing and characterising metamaterial based temporal lenses. Metalenses have the potential to enhance our control over diffraction-limited light enabling dynamic aberration correction, zooming lenses and wavelength-dependent polarisers. Indium tin oxide (ITO) nano-films and resonating nano-antennas are modulated at ultrafast timescales driving large index changes or resonant scattering respectively. Using high-energy, ultrashort pulses with tunable wavelength, the characteristics of theoretically modelled metalenses is investigated and applications in communication and light control are highlighted.</p>
14:00 - Tunable and Reconfigurable Metasurfaces for Imaging, Sensing, and Spectral Control

Session chairperson(s): Femius Koenderink; Odysseas Tsilipakos

14:00 - 14:30 - Controllable and tunable dielectric metasurfaces Invited oral [Show abstract]
  • Uriel Levy, HUJI, Israel
  • Zetian Chen, HUJI, Israel
  • Noa Mazurski, HUJI, Israel
  • Oren Goldberg, HUJI, Israel
  • S. Jagan Mohan Rao, HUJI, Israel
  • Jacob Engelberg, HUJI, Israel
  • Ronen Mazurski, HUJI, Israel
We present our recent work related to controlling the properties of dielectric metasurfaces. Variety of tunability mechanisms are discussed and demonstrated. Different wavelength regimes are explored, from the visible and all the way to the thermal regime.
14:30 - 15:00 - Tunable “Meta”-Optical Fibers for Advanced Imaging and Endoscopy Invited oral [Show abstract]
  • Howard Lee, University of California, Irvine, USA
  • Andrew Palmer, University of California, Irvine, USA
  • Yucheng Jin, University of California, Irvine, USA
  • Beyonce Hu, University of California, Irvine, USA
  • Harvey Lin, University of California, Irvine, USA
  • Stuart Love, University of California, Irvine, USA
  • David Dang, University of California, Irvine, USA
I will present our recent development of passive and active “Meta”-optical fiber, an advanced optical fiber integrated with emerging metasurface concepts.
15:00 - 15:15 - Reconfigurable Sb2Se3 Metasurface Filter Design for Compressive-Sensing-Enabled Atmospheric Trace-Gas Recognition Oral [Show abstract]
  • Kim Bui, Dutch Organization for Applied Scientific Research (TNO) and Delft University of Technology (TU Delft), Netherlands
  • Sebastian Falckenheiner, Dutch Organization for Applied Scientific Research (TNO) and Eindhoven University of Technology (TU/e), Netherlands
  • Pierre Piron, Delft University of Technology (TU Delft), Netherlands
  • Bart Kooi, University of Groningen, Netherlands
  • Giampiero Gerini, Dutch Organization for Applied Scientific Research (TNO) and Eindhoven University of Technology, Netherlands
In this paper, we propose the design of a reconfigurable metasurface filter incorporating phase change materials (PCMs). This filter is part of a novel spaceborne spectrometer concept for atmospheric monitoring. The metasurface filter consists of PCMs pillars embedded in a diamond matrix. The combination of shape and material properties results in resonances that give rise to specific spectral filtering functions. The optical properties of PCMs, and hence the transmission function, change when stimulated with a pulsed laser. In combination with a compressive sensing (CS) algorithm, a limited number of measurements with a single metasurface results in precise reconstructions of the Earth’s atmospheric spectrum.
15:15 - 15:30 - Analysis and Design of a Reconfigurable Metasurface based on Chalcogenide Phase-Change Material for Operation in the Near and Mid Infrared Oral [Show abstract]
  • Alexandros Pitilakis, Aristotle University of Thessaloniki (AUTH), Greece
  • Alexandros Katsios, University of Western Macedonia (UoWM), Greece
  • Alexandros-Apostolos Boulogeorgos, University of Western Macedonia (UoWM), Greece
We analyze, design and assess the performance of a reconfigurable holographic metasurface architecture for optical wireless communications in the infrared. The device is based on the GST phase-change material. We analytically assess the response using transmission line theory and equivalent circuits, fully incorporating the broadband GST material dispersion.
14:00 - Nonlinear and Active Metasurfaces for Frequency Generation, Lasing, and Optical Control

Session chairperson(s): Owen Miller; Dragomir Neshev

14:00 - 14:30 - Solution Derived Barium Titanate and Lithium niobate for Nonlinear Optical Computing and Light Modulator Invited oral [Show abstract]
  • Rachel Grange, ETH Zurich, Switzerland
We fabricate nonlinear active devices from nanoimprinted solution and nanoparticles of barium titanate and lithium niobate. We demonstrate second-harmonic and electro-optic properties at small scale suited for optical computing or fast light modulator.
14:30 - 14:45 - Perovskite Polariton Condensation with Scalable Silicon Metasurfaces Oral [Show abstract]
  • Marco Marangi, Centre for Disruptive Photonic Technologies, SPMS, NTU, Singapore
  • Andrea Zacheo, Centre for Disruptive Photonic Technologies, SPMS, NTU, Singapore
  • Alexander M. Dubrovkin, Centre for Disruptive Photonic Technologies, SPMS, NTU, Singapore
  • Giorgio Adamo, Centre for Disruptive Photonic Technologies, SPMS, NTU, Singapore
  • Cesare Soci, Centre for Disruptive Photonic Technologies, SPMS, NTU, Singapore
We report the first experimental demonstration of exciton-polariton condensation in a polycrystalline perovskite film, by hybridizing it with a silicon metasurface, and show polariton lasing. To this end we use bound states in the continuum (BIC) resonances because of their inherently high quality factor. This work establishes a scalable pathway for polaritonic devices compatible with silicon photonics.
14:45 - 15:00 - Generation of High Harmonics from Resonant Metasurfaces Oral [Show abstract]
  • Pavel Tonkaev, The Australian National University, Australia
  • Felix Richter, Ecole Polytechnique Federale de Lausanne, Switzerland
  • Ivan Toftul, The Australian National University, Australia
  • Ivan Sinev, Ecole Polytechnique Federale de Lausanne, Switzerland
  • Hatice Altug, Ecole Polytechnique Federale de Lausanne, Switzerland
  • Yuri Kivshar, The Australian National University, Australia
We experimentally demonstrate a high harmonic generation enhancement of at least three orders of magnitude from a free-standing silicon membrane driven by a quasi-bound state in the continuum resonance. The harmonic power dependencies exhibit unconventional behaviour at resonance, while outside the resonance, they follow classical scaling.
15:00 - 15:30 - Light Shaping Light via Optical Meta-Structures Invited oral [Show abstract]
  • Natalia Litchinitser, Duke University, United States
  • Hooman Barati Sedeh, Duke University, United States
  • Jiannan Gao, Duke University, United States
  • Dmitrii Tsvetkov, Duke University, United States
  • Yuruo Zheng, Duke University, United States
  • Danilo Gomes Pires, Duke University, United States
  • Maria Antonietta Vincenti, University of Brescia, Italy
  • Michael Scalora, 3Aviation and Missile Center, US Army CCDC, United States
We introduce a rigorous theoretical approach for sculpting three-dimensional, topological particle-like objects, such as optical knots or links, including precise control of their parts. We also discuss a novel concept called topology imprinting, utilizing judiciously designed all-dielectric nonlinear flat and multi-layered optics to replicate desired waveforms at multiple frequencies, opening new avenues for advanced photonic applications.
15:30 - 16:00 - Coffee Break (Tuesday Afternoon)
16:00 - 17:30 - Oral Sessions (Tuesday Afternoon 2)
16:00 - Special session: Metamaterials and Robotics 2

Organizer(s): Benjamin Gorissen

Session chairperson(s): Benjamin Gorissen; Eleonora Tubaldi

16:00 - 16:30 - Colloidal pivots enable Brownian mechanisms, metamaterials, and machines Invited oral [Show abstract]
  • Daniela Kraft, Leiden University, Netherlands
Biological machines harness targeted deformations that can be actuated by Brownian fluctuations. However, while synthetic micromachines can similarly leverage targeted deformations they are too stiff to be driven by thermal fluctuations and thus require strong forcing. Furthermore, systems that are able to change their conformation by thermal fluctuations do so uncontrollably or require external control. In this talk, I will show how we leverage DNA-based sliding contacts to create colloidal pivots, rigid anisotropic objects that freely fluctuate around their pivot point, and use a hierarchical strategy to assemble these into Brownian metamaterials and machines with targeted deformation modes. I will demonstrate how we realized the archetypical rotating diamond and rotating triangle, or Kagome, geometries, whose auexetic deformations are driven by thermal. Finally, I will present the implementation of magnetic actuation to achieve an elementary Brownian machine with easily actuatable deformations that can harness Brownian fluctuations. Together, our work introduces a strategy for creating thermal mechanical metamaterials and leverages them for functional Brownian devices, paving the way to materialize flexible, actuatable structures for micro-robots, smart materials, and nano-medicine.
16:30 - 17:00 - From Morphogenesis to Metamaterials: Constraint-Driven Folding and Morphing Invited oral [Show abstract]
  • Mingchao Liu, University of Birmingham, United Kingdom
Constraint-driven folding enables adaptive shape transformations across biological and engineered systems. We explore dehydration-induced folding in plant leaves, tension-induced giant folding in elastic sheets, and tunable morphing in meta-ribbons, revealing how geometric constraints and localized forces bridge natural morphogenesis and metamaterials for programmable shape-changing designs.
17:00 - 17:30 - Panel Discussion Round Table Discussion [Show abstract]
  • Benjamin Gorissen, KU Leuven, Belgium
  • Eleonora Tubaldi, University of Maryland, USA
  • Aniket Pal, University of Stuttgart, Germany
  • Anton Souslov, University of Cambridge, UK
  • Itai Cohen, Cornell University, USA
  • Daniela Kraft, Leiden University, The Netherlands
  • Mingchao Liu, University of Birmingham, UK
Panel discussion moderated by Benjamin Gorissen
16:00 - Non-linear and Active Microwave Metamaterials

Session chairperson(s): Stefano Maci; Filippo Capolino

16:00 - 16:30 - A Concept of Generalized Positive/negative Time-varying Capacitor Invited oral [Show abstract]
  • Silvio Hrabar, University of Zagreb, Croatia
Some exotic and potentially very useful EM phenomena have been predicted, which presume the existence of materials with a permittivity whose value varies between negative and positive values. A possible artificial realization of these media would require positive/negative time-varying capacitors, which are currently not available. Here we propose a concept to realize these capacitors, based on the combination of a negative impedance converter terminated with a varactor diode.
16:30 - 16:45 - Broadband Anomalous Refractor Based on Transmission Achromatic Metasurface Oral [Show abstract]
  • Sen Zheng, Southeast University, China
In this paper, a broadband anomalous refractor is proposed based on transmission achromatic metasurface achieved by receiver-transmitter integrated (RTI) units with meandering stripline. The transmission phase curves of the RTI unit can be precisely tailored by combining the geometric phase, determined by the rotation angle, with the propagation phase, governed by the length of stripline. Then, a broadband refractor is realized by assembling RTI units. Simulations indicate that the anomalous refractor can achieve stable anomalous refraction at a fixed refraction angle of 16° within the frequency range of 27 to 37 GHz, which verified the effectiveness of our design method.
16:45 - 17:15 - Indefinite Gain Across Physical Wave Platforms Invited oral [Show abstract]
  • Mario Silveirinha, University of Lisbon, Portugal
I will present a unified framework for understanding indefinite gain across different platforms, demonstrating that electromagnetic media with transistor-like responses are fundamentally analogous to odd-elastic systems. I will further show how wave phenomena in such systems can be strongly geometry-dependent, and how geometrical-phases can be harnessed to tailor gain responses.
17:15 - 17:30 - Time-Varying Capacitor based on Switching Capacitor Bank Oral [Show abstract]
  • Darin Nozina, University of Zagreb, Croatia
  • Srdjan Milic, University of Zagreb, Croatia
  • Igor Krois, University of Zagreb, Croatia
  • Silvio Hrabar, University of Zagreb, Croatia
Recent developments in time-varying reactive elements have revealed several new ideas, such as the emulation of a non-Foster element by a commercial time-varying reactance such as a varactor diode. Unfortunately, commercial varactor diodes have limited dynamic range of the generated capacitance and, more importantly, low power consumption. In order to contribute to the solution of this problem, we propose a switched capacitor bank that behaves like a time-varying capacitor.
16:00 - Dynamic Wavefront Control with Tunable and Time-Varying Metasurfaces

Session chairperson(s): Victor Pacheco-Peña; Amir Jafargholi

16:00 - 16:30 - Metasurfaces For Wave-front Modulation Across The Electromagnetic Spectrum From Microwaves To Optical Frequencies Invited oral [Show abstract]
  • Giampiero Gerini, TNO - Optics Department; Technology University of Eindhoven, Netherlands
In this paper, we present an overview of several research activities on metasurfaces, over a very broad frequency range, from microwaves up to the infrared and visible spectrum, performed at TNO in the last years.
16:30 - 16:45 - Dynamic Surface Plasmonic Polaritons Routing by Dispersion Control of Tunable Metasurface Oral [Show abstract]
  • Shaojie Wang, Nanjing University, China
  • Ke Chen, Nanjing University, China
  • Yijun Feng, Nanjing University, China
Topological polaritons in extremely anisotropic materials provide unprecedented control of light-matter interactions and also the energy flow of waves. Developing an active topological platform to provide reconfigurable wave functionalities showcases much potential in device applications, yet remains largely unexplored. Here, we report a metasurface approach to realize electrically reconfigurable elliptical-to-hyperbolic topological transitions of surface plasmonic polaritons by artificial electromagnetic anisotropy incorporating voltage-controlled capacitive components. By exploiting the group velocity of topological transitions, we observe controllable field canalizations facilizing ultra-collimated energy transfer. Furthermore, we conceived a planar reconfigurable polariton circuit that enables on-demand polariton propagation routing. Our findings may offer new opportunities to advance programmable integrated plasmonic devices with potential applications in imaging, sensing, and detection.
16:45 - 17:00 - Mechano-Optical Metasurfaces Oral [Show abstract]
  • Freek van Gorp, University of Amsterdam, Netherlands
  • Wenfeng Liu, University of Amsterdam, Netherlands
  • Corentin Coulais, University of Amsterdam, Netherlands
  • Jorik van de Groep, University of Amsterdam, Netherlands
Tunable metasurfaces enable active and on-demand control over optical wavefronts through reconfigurable scattering of resonant nanostructures. Here, we present novel insights inspired by mechanical metamaterials to achieve giant tunability in mechano-optical metasurfaces where the mechanical metamaterial and optical metasurfaces are integrated in a single nanopatterned material. We eliminate the substrate and demonstrate a nanopatterned silicon membrane that simultaneously functions as a mechanical metamaterial and an optical metasurface with large tunability. Our results highlight a promising route toward active metasurfaces, with potential applications in tunable filters, reconfigurable lenses, and dynamic wavefront shaping.
17:00 - 17:15 - MEMS Tunable Optical Metasurfaces Oral [Show abstract]
  • Chao Meng, University of Southern Denmark, Denmark
  • Paul Thrane, SINTEF Microsystems and Nanotechnology, Norway
  • Fei Ding, University of Southern Denmark, Denmark
  • Sergey Bozhevolnyi, University of Southern Denmark, Denmark
Electrically tunable metasurfaces offer significant potential for miniaturized and adaptive optoelectronic systems. Here, we present the concept and experimental realization of our MEMS-OMS platform, enabling efficient and fast dynamic light field manipulation. We highlight two implementations: a tunable waveplate for full-range birefringence control and a tunable bilayer metasurface for dual-state phase control.
17:15 - 17:30 - Extreme Field Enhancement In High-index Tunable Metamaterials Oral [Show abstract]
  • Zoltan Sztranyovszky, University of Birmingham, United Kingdom
  • Nicolas Spiesshofer, University of Cambridge, United Kingdom
  • Caleb Todd, University of Cambridge, United Kingdom
  • Rakesh Arul, University of Cambridge, United Kingdom
  • Jeremy Baumberg, University of Cambridge, United Kingdom
  • Angela Demetriadou, University of Birmingham, United Kingdom
We show that metamaterials made from gold nanoparticles self-assembled in layered aggregates with nanometer-sized gaps, exhibit remarkably high refractive index, tuneable by minute changes in the gap size, shape and lattice structure, while exhibiting extreme field enhancement in the gaps, which allows applications in sensing, enhancing non-linearities and up-conversion processes.
16:00 - Chiral Light-Matter Interaction

Session chairperson(s): Howard Lee; Carsten Rockstuhl

16:00 - 16:30 - The Role of Chirality in Controlling Light-Matter Interactions Invited oral [Show abstract]
  • Giuseppe Strangi, Case Western Reserve University, USA
In this work, we explore the implications of chirality in photonic and plasmonic systems, focusing on the design and implementation of chiral metasurfaces. By leveraging superchiral fields, we demonstrate enhanced optical chirality densities beyond conventional chiral systems, opening new avenues for applications in chiral sensing, enantioselective spectroscopy, and quantum photonics.
16:30 - 16:45 - Metamirrors and Strong Chirality in the Reflection Geometry Oral [Show abstract]
  • Maxim Gorkunov, Institute of Crystallography, NRC Kurchatov Institute, Russia
  • Alexander Antonov, Ludwig-Maximilians-University of Munich, Germany
  • Seongheon Kim, Ulsan National Institute of Science and Technology, Republic of Korea
  • Andreas Tittl, Ludwig-Maximilians-University of Munich, Germany
  • Young Chul Jun, Ulsan National Institute of Science and Technology, Republic of Korea
  • Yuri Kivshar, Australian National University, Australia
Chiral dielectric metasurfaces interact resonantly with circularly polarized light by virtue of coupling selectivity of photonic eigenstates. Many chiral devices emitting and detecting circularly polarized light require integration with highly reflective mirrors. Here we study advanced designs of chiral metacavities and suggest the strategies to achieve strong chiral optical response in the reflection geometry by combining mirrors and planar achiral metasurfaces.
16:45 - 17:00 - k-Space Polarimetry of Metasurface Enhanced Chiral Emission: Polarization Singularities and Handedness Reversal Oral [Show abstract]
  • Debapriya Pal, Department of Physics of Information in Matter and Center for Nanophotonics, NWO-I Institute AMOLF, Science Park 104, NL 1098 XG Amsterdam, The Netherlands, The Netherlands
  • A. Femius Koenderink, Department of Physics of Information in Matter and Center for Nanophotonics, NWO-I Institute AMOLF, Science Park 104, NL 1098 XG Amsterdam, The Netherlands, The Netherlands
Chiral light emission is crucial for advanced photonic devices, yet controlling it for both achiral and chiral emitters remains challenging. Metasurfaces can transform incoherent emitters into spatially coherent sources, as studied in thermal sources and solid-state lighting. Using k-space polarimetry and reciprocity-based T-matrix calculations, we unveil the complex topology of far-field polarization in incoherent metasurface-enhanced emission and an unexpected reversal of intrinsic molecular handedness in chiral emitters coupled to metasurfaces.
17:00 - 17:15 - Chiral Resonant Dielectric Metasurfaces Oral [Show abstract]
  • Ivan Toftul, Research School of Physics, Australian National University, Australia
  • Yuri Kivshar, Research School of Physics, Australian National University, Australia
We summarise our recent studies of chiral effects in linear and nonlinear resonant dielectric metasurfaces. We develop a comprehensive approach for maximising optical chirality in metasurfaces through engineering of lattice and meta-atom symmetries and exploration of the modal strong coupling. By leveraging monoclinic lattice geometries, we demonstrate that even metasurfaces composed of achiral meta-atoms can exhibit pronounced intrinsic chiral response in both linear and nonlinear regimes. We also analyse how chirality can be controlled by meta-atom rotation, and present experimental validations of our theoretical predictions.
17:15 - 17:30 - Arbitrary Polarized Photon Sources With Quantum Emitter Integrated Metasurfaces Oral [Show abstract]
  • Xujing Liu, University of Southern Denmark, Denmark
  • Yinhui Kan, University of Southern Denmark, Denmark
  • Shailesh Kumar, University of Southern Denmark, Denmark
  • Fei Ding, University of Southern Denmark, Denmark
  • Sergey Bozhevolnyi, University of Southern Denmark, Denmark
We propose a method that enables single-photon emission into arbitrary polarization states with compact chip-scale devices by integrating quantum emitters (QEs) with metasurfaces. Metasurfaces with segmented areas of anisotropic nano-scatterers are employed to efficiently outcouple the QE-excited surface plasmon polaritons, forming free-space radiation consisting of two orthogonally linearly polarized components with completely and independently tailored phases and amplitudes. The design enables single-photon generation encoded with arbitrary polarization states, covering thereby the whole Poincaré sphere.
16:00 - Meta- Computing and Processing

Session chairperson(s): Nicoletta Granchi

16:00 - 16:30 - Information Theory of End-to-End Meta-Imagers Invited oral [Show abstract]
  • Owen Miller, Yale University, USA
  • Lukas Kienesberger, Yale University, USA
  • Zeyu Kuang, Yale University, USA
Optical devices frequently no longer need to produce interpretable images and can instead simply encode information. I will describe general information-theoretic considerations for the optics: key factors enabling information extraction, strong constraints on intensity-only measurements, and new metrics enabling data-agnostic optimization of information-encoding optics.
16:30 - 17:00 - Nonlinear Metasurfaces for Upconversion and Image Processing Invited oral [Show abstract]
  • Dragomir Neshev, Australian National University, Australia
The detection of short-wave infrared light has critical applications in surveillance, autonomous navigation, and biological imaging. We present innovative infrared imaging and image processing using nonlinear up-conversion to visible on a high-quality-factor lithium niobate metasurface. High conversion efficiency and resolution quality are demonstrated. Additionally, the potential for image processing enhanced by direct up-conversion imaging is discussed.
17:00 - 17:15 - Excitonic 2D Metasurface for Tunable Image Processing Oral [Show abstract]
  • Bernardo Dias, University of Amsterdam, Netherlands
  • Andrea Cordaro, AMOLF, Netherlands
  • Ludovica Guarneri, University of Amsterdam, Netherlands
  • Albert Polman, AMOLF, Netherlands
  • Jorik van de Groep, University of Amsterdam, Netherlands
Edge detection is a central process in Computer Vision, and low-power operation is achievable using optical metasurfaces. Nevertheless, the operation of these devices is still passive. We propose an active metasurface performing a switchable spatial differentiation by leveraging the coupling between a Fano resonance and an exciton in monolayer WS2.
17:15 - 17:30 - 36 channels Spin and Wavelength Co-multiplexed Metasurface Holography by Phase-gradient Inverse Design Oral [Show abstract]
  • Cherry Park, POSTECH, Korea (South)
Metasurface holography enables high-resolution image multiplexing, but scaling channel capacity remains a challenge. This paper presents a high-capacity single-cell metasurface that multiplexes holographic images across spin and wavelength using a single-phase map. Optimized via inverse design and automatic differentiation, the phase profile encodes multiple images without complex meta-atoms, simplifying fabrication while maintaining performance. We demonstrate an 8-channel hologram spanning visible to near-infrared wavelengths and a 36-channel hologram covering the full-visible spectrum with 18 wavelengths at 20-nm intervals. Noise suppression loss functions were integrated to reduce background noise and inter-channel crosstalk, significantly enhancing image quality.
17:30 - 18:30 - Plenary Session III
17:30 - Plenary Session III

Session chairperson(s): Corentin Coulais

17:30 - 18:30 - Elastronic Metamaterials Plenary [Show abstract]
  • Itai Cohen, Cornell University, USA
<p> What would we be able to do if we could build electronically integrated machines at a scale of 100 microns? At this scale, semiconductor devices are small enough that we could put the computational power of the spaceship Voyager onto a machine component no bigger than the footprint of a single hair. Such robotic components could have on board detectors, power sources, and processors that enable them to sense, interact, and control their local environment. In this talk I will describe a new idea for using this technology to develop a novel materials platform:&nbsp;elastronic metamaterials, which combine electronic circuits at the level of the metamaterial building block. This integration would open the door to making materials with properties that would be impossible to achieve naturally including: response times that approach the speed of light; wave amplification; and materials that can sense and adapt to their environment.</p>
3 September 2025 / Start time: 9 h 0 min
09:00 - 10:00 - Plenary Session IV
09:00 - Plenary Session IV

Session chairperson(s): Francesco Monticone

09:00 - 10:00 - Waves That Do What We Want: Applications, Limits, and Programming of Complex Optics Plenary [Show abstract]
  • David Miller, Stanford University, USA
We can now make complex optics far beyond classical lenses and mirrors, including sophisticated metamaterials and photonic integrated circuits, with capabilities beyond previous concepts, and fully programmable and even capable of self-configuration. This talk addresses fundamental concepts and practical approaches to exploit such complexity in new applications.
10:00 - 10:30 - Coffee Break (Wednesday Morning)
10:30 - 12:30 - Oral Sessions (Wednesday Morning)
10:30 - Special session: Metamaterials and Information I

Organizer(s): Nader Engheta; Romain Fleury

Session chairperson(s): Romain Fleury; Nader Engheta

10:30 - 11:00 - Informatic Metamaterials Invited oral [Show abstract]
  • Nader Engheta, University of Pennsylvania, USA
In this talk, I will discuss the emerging roles of metamaterials in information science and technology. Metamaterials and metasurfaces have provided a versatile platform for tailoring and manipulating waves, leading to exciting functionalities. One such possibility is the use of metamaterials in wave-based information processing, data handling, and analog computing. As machine learning (ML), artificial intelligence (AI), large language models (LLM), and generative AI such as ChatGPT increasingly become part of our daily lives, it is important to explore how metamaterials can play crucial roles in handling and processing tremendous amounts of data with low energy and high speed. I will give an overview of some of the recent and ongoing developments in this field, discuss some of their advantages and constraints, and forecast future possibilities
11:00 - 11:30 - Engineered Nonlocalities for Analog Optical Computing Invited oral [Show abstract]
  • Andrea Alu, CUNY Advanced Science Research Center, USA
Engineered nonlocal responses of meta-structures provide a powerful platform to manipulate and control the information contained in the signals that propagate and interact with them. In this talk, I will discuss our recent progress on nonlocal metasurfaces, meta-structures and metamaterials aimed at processing incoming signals and images to realize fast, efficient and massively parallel wave-based computing.
11:30 - 12:00 - Meta-operators for all-optical image processing Invited oral [Show abstract]
  • Humeyra Caglayan, Eindhoven University of Technology, Netherlands
All-optical image processing enables ultrafast, energy-efficient computation by exploiting the parallelism of light. However, existing approaches often rely on bulky optics or are limited to single operations. We present a metasurface-based platform—meta-operators—that performs arbitrary image transformations in a compact, passive format. By integrating double-phase encoding and polarization multiplexing, we realize diverse analog operations, including first- and second-order differentiation, cross-correlation, and high-fidelity 3D holography, all at visible wavelengths. This scalable design establishes a versatile framework for real-time optical computing, intelligent vision systems, and compact volumetric displays.
Media link(s):

See arxiv preprint https://arxiv.org/abs/2503.12252

12:00 - 12:30 - Meta-optics for Edge Computing Invited oral [Show abstract]
  • Hanyu Zheng, Vanderbilt University, USA
  • Quan Liu, Vanderbilt University, USA
  • Brandon Swartz, Vanderbilt University, USA
  • Xiaomeng Zhang, Vanderbilt University, USA
  • Ivan Kravchenko, Oak Ridge National Laboratory, USA
  • Yuankai Huo, Vanderbilt University, USA
  • Jason Valentine, Vanderbilt University, USA
This talk will focus on the use of meta-optics for implementing computation for edge sensors, serving to off-load computationally expensive convolutional operations from a digital processing platform, reducing both latency and power consumption.
10:30 - Plasmonics: Observation and Application

Session chairperson(s): Maryna Meretska; Lisa Poulikakos

10:30 - 11:00 - When Plasmon Is Not Really a Plasmon but Just a Photon Confined Near Metal. Invited oral [Show abstract]
  • Jacob Khurgin, Johns Hopkins University, USA
Metallic structures demonstrate wavelength-dependent loss, with reduced loss at mid-IR to THz wavelengths. This talk distinguishes two regimes: “plasmonic” (high loss, size-independent resonances) and “metal-confined photon” (low loss, size-dependent resonances), emphasizing that non-plasmonic modes at larger structures are better described by conventional RF frameworks than by plasmonics.
11:00 - 11:15 - Angle-Resolved Cathodoluminescence Interferometry of Plasmonic Scatterers Oral [Show abstract]
  • Evelijn Akerboom, AMOLF, Netherlands
  • Nahid Talebi, Kiel University, Germany
  • Javier García de Abajo, ICFO, Barcelona
  • Albert Polman, AMOLF, Netherlands
High-energy electrons in a SEM excite resonances in plasmonic and dielectric nanostructures that radiate to the far field as cathodoluminescence (CL) emission. Here, we demonstrate CL interferometry, unveiling the coherent characteristics of plasmon excitations at nanometer spatial resolution and femtosecond time scale.
11:15 - 11:30 - Toward Complete Optical Coupling to Confined Surface Polaritons Oral [Show abstract]
  • Saad Abdullah, Institute of Photonic Sciences (ICFO), Spain
  • Eduardo J.C. DIAS, ICFO, SPAIN
  • Jan KRPENSKY, ICFO, SPAIN
  • Vahagn MKHITARYAN, ICFO, PURDUE UNIVERSITY, SPAIN
  • Javier GARCIA DE ABAJO, ICFO, ICREA, SPAIN
We experimentally demonstrate efficient optical coupling of free-space propagating light into surface plasmon polaritons using engineered gold disk scatterers positioned above a gold surface with a controlled silica spacer. Optimizing spacer thickness yields maximal coupling cross sections approaching the incident wavelength squared, providing a versatile framework for enhancing light-polariton interactions.
11:30 - 11:45 - Deriving 3D Surface Charge Density in Tapered Plasmonic Nanostructures by Cathodoluminescence Spectroscopy Oral [Show abstract]
  • Stan de Peinder, AMOLF, Netherlands
  • Matthias Liebtrau, AMOLF, Netherlands
  • Wiebke Albrecht, AMOLF, Netherlands
  • Javier García de Abajo, ICFO-Institut de Ciencies Fotoniques, ICREA-Institució Catalana de Recerca i Estudis Avançats, Spain
  • Albert Polman, AMOLF, Netherlands
Abstract – We derive the surface electric charge density distribution on resonantly excited tapered plasmonic nanostructures at high spatial resolution through cathodoluminescence spectroscopy (CL). From 2D CL maps that represent the electric near-field distribution around Au nanotapers, we derive the surface potential distribution, which in turn allow us to find the surface charge distribution on the nanotips. Comparing measurements and numerical simulation for plasmonic tips with a radius of curvature < 5 nm, we find that the absolute charge density distributions depend strongly on the nanoscale tip geometry. Insights into the nanoscale distribution of electrical charges should allow for the optimization of plasmon-driven sustainable chemical reactions.
11:45 - 12:00 - Plasmonic Trimer-Based Wearable Hydrogel SERS Chip for Uric Acid Detection in Sweat Oral [Show abstract]
  • Guoqun Li, Southeast University, China
  • Teng Qiu, Southeast University, China
  • Qi Hao, Southeast University, China
This study introduces a wearable SERS chip with a hydrogel membrane and plasmonic trimers for non-invasive uric acid detection in sweat. It enables real-time monitoring, correlates well with blood tests, and reveals exercise-induced metabolic changes, offering potential for hyperuricemia management.
12:00 - 12:15 - Exploring Plasmonic MetaSurface: Opportunities in Photothermal Catalysis and Advanced Thermal Emitters. Oral [Show abstract]
  • Samira Mehrabi, university of toronto, Canada
  • Richard Zhang, university of toronto, Canada
  • nazir kherani, university of toronto, Canada
Abstract – MetaSurfaces enable precise control over electromagnetic and thermal radiation at subwavelength scales. They enhance photothermal heating, concentrate electromagnetic energy for catalytic reactions, while also serving as thermal emitters with tuned emissivity for efficient heat management utilization. These functionalities can advance heterogeneous catalysis, optimizing energy conversion and chemical processes in sustainable applications.
12:15 - 12:30 - Surface Plasmon Enhanced Photocatalysis Oral [Show abstract]
  • Dongling Ma, Institut national de la recherche scientifique (INRS), Canada
With unique surface plasmon resonance properties, plasmonic nanostructures are able to enhance photon harvesting of semiconductor materials via hot carrier injection, near-field effects and/or enhanced light scattering, which has significant implications for the realization of cost-effective high-performance solar utilization technologies. In this talk, I will overview some of our recent progress on the development of plasmonic nanostructures and their beneficial role in solar fuel production, photocatalytic degradation of pollutants and solar cells.
10:30 - Computing, Learning and Wave Control in Mechanical Metamaterials

Session chairperson(s): Siddhant Kumar; Qingxiang Ji

10:30 - 11:00 - Emergent Computing in Mechanical Metamaterials Invited oral [Show abstract]
  • martin van hecke, Amolf and University Leiden, Netherlands
The state of a multistable material can often be described by a collection of material bits. Here we leverage buckling and snapping to realize metamaterials with precisely controlled mechanical bits. In particular, we realized metamaterials that count how often they are compressed [1], rewritable shapeshifting metamaterials [2], and more generally, materials that act as finite state machines [3] - a paradigm of computing. Our strategy can be extended to other material bits, such as spins, and opens the door to in-materia computing.
11:00 - 11:15 - Bistable Shape-morphing Kirigami Structures Oral [Show abstract]
  • XIAOYUAN YING, University of Edinburgh, United Kingdom
  • Marcelo Dias, University of Edinburgh, United Kingdom
In this work, we present a bistable shape-morphing kirigami structures. Firstly, we study the geometry and kinematics of a hexagon bistable kirigami unit and propose a simplified analytical model for energy analysis based on Euler beam theory. Secondly, a finite element analysis is conducted to investigate and verify the effectiveness of our simplified model. Last, a framework for bistable shape-morphing kirigami structures is proposed
11:15 - 11:30 - Frustrated Active Metamaterial Oral [Show abstract]
  • Rupesh Mahore, University of Amsterdam, Netherlands
  • Xiafei Guo, University of Amsterdam, Netherlands
  • Corentin Coulais, University of Amsterdam, Netherlands
  • Oleksandr Gamayun, University of Amsterdam, United KIngdom
<p> The principle of reciprocity is ubiquitous in most of the physical systems and is of- ten violated in out-of-equilibrium systems, extensively studied in past few decades. While most of the studies typically describe a mono-stable non equilibrium steady state, here we induced topological non orient-ability in robotic metamaterial interacting non reciprocally to get multi- ple steady states. Through numerical simulations, experiments and theory we demonstrate that these states can be isolated within a region in parameter space and non orientability further enhances the robustness and control over these states.</p>
11:30 - 12:00 - Nonlocal Metamaterials: Review and Recent Progress Invited oral [Show abstract]
  • Yi Chen, Karlsruhe Institute of Technology, Germany
  • Martin Wegener, Karlsruhe Institute of Technology, Germany
After a brief review of the field of static and dynamic nonlocal metamaterials in mechanics, electromagnetism, and transport, we focus on effective-medium descriptions of recent experiments on nonlocal versions of Ohm’s law and Hooke’s law.
12:00 - 12:15 - 3D Odd Elastic Metamaterials Oral [Show abstract]
  • Yuan Zhou, University of Amsterdam, Netherlands
  • Rupesh Mahore, University of Amsterdam, Netherlands
  • Corentin Coulais, University of Amsterdam, Netherlands
Metamaterials with engineered microstructures exhibit exotic mechanical properties, but passive solids are limited by energy conservation. Introducing active, non-conservative interactions enables odd elastic moduli, which are absent in passive systems. Here, we design and characterize 3D odd elastic metamaterials using non-reciprocal interactions. By integrating Hookean and feedback-controlled non-pairwise springs, we establish the link between microscopic stiffness and macroscopic moduli through a coarse-grained model. Our results reveal multiple odd moduli in 3D active solids, coupling distinct deformation modes and highlighting the potential for programmable, multi-modal robotic materials.
12:15 - 12:30 - Metamaterial that Learns Shape Changes by using Contrastive Learning Oral [Show abstract]
  • Yao Du, University of Amsterdam, Netherlands
  • Corentin Coulais, University of Amsterdam, Netherlands
Learning to change shape is a fundamental strategy of adaptation and evolution in crossing scales from cells to animals. Synthetic materials can also exhibit complex shape changing capabilities, but lack the ability to learn. Here, we build metamaterials that can learn complex changes by using a constrastive learning scheme. By progressively updating their local stiffnesses, our metamaterials are able to forget and learn new shape changes in sequence, learn multiple shape changes that break reciprocity, and learn multistable shape changes, which in turn allows them to perform reflex gripping actions and locomotion. Our findings establish metamaterials as an exciting platform for physical learning, which in turn opens avenues for the use of physical learning to design adaptive materials and robots.
10:30 - Quantum Metamaterials

Session chairperson(s): Katja Höflich; Alexander Khanikaev

10:30 - 11:00 - Metamaterial Enhanced Unipolar Quantum Optoelectronics Invited oral [Show abstract]
  • Angela Vasanelli, Laboratoire de Physique de l’ENS, École Normale Supérieure, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, 75005 Paris, France
  • Jihye baik, Laboratoire de Physique de l’ENS, École Normale Supérieure, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, 75005 Paris, France
  • Livia Del Balzo, Laboratoire de Physique de l’ENS, École Normale Supérieure, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, 75005 Paris, France
  • Thomas Bonazzi, Laboratoire de Physique de l’ENS, École Normale Supérieure, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, 75005 Paris, France
  • Hamza Dely, Laboratoire de Physique de l’ENS, École Normale Supérieure, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, 75005 Paris, France
  • Marta Mastrangelo, Laboratoire de Physique de l’ENS, École Normale Supérieure, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, 75005 Paris, France
  • Baptiste Chomet, Laboratoire de Physique de l’ENS, École Normale Supérieure, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, 75005 Paris, France
  • Konstantinos Pantzas, Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, Palaiseau, France
  • Grégoire Beaudoin, Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, Palaiseau, France
  • Isabelle Sagnes, Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, Palaiseau, France
  • Carlo Sirtori, Laboratoire de Physique de l’ENS, École Normale Supérieure, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, 75005 Paris, France
Metamaterials play an important role in the development of optoelectronic devices due to their ability to enhance the coupling between free-space radiation and the absorbing or emitting medium. In this work, we present unipolar quantum devices operating in the mid-infrared wavelength range and discuss how their implementation into metamaterial architectures can improve their performances and leverage new degrees of freedom for their design.
11:00 - 11:15 - Simultaneous Single- and Two-Mode Squeezing in Time-Varying Media Oral [Show abstract]
  • Artuur Stevens, KU Leuven, Belgium
  • Christophe Caloz, KU Leuven, Belgium
We study the squeezing of light beams in a system combining beam splitters and time-varying media. First, we derive the input-output operator transformations for time-varying media. Integrating these with the input-output operator transformations of beam splitters allows describing arbitrary sequences of beam splitters and time-varying media. We show that a specific configuration—beam splitter, time-varying medium, beam splitter, time-varying medium—enables simultaneous single- and two-mode squeezing. This dual squeezing mechanism leverages the benefits of both types of squeezing, offering potential advantages for highprecision, non-demolition measurements.
11:15 - 11:30 - Hyperbolic Quantum Processor. Oral [Show abstract]
  • Evgeniy Narimanov, Purdue University, USA
  • Eugene Demler, ETH Zurich, Switzerland
Long-range qubit entanglement can be readily achieved when interactions are mediated by optical polariton waves in a hyperbolic material, due to the phenomenon of the Hyperbolic Super-Resonance. With the corresponding quantum gate operations defined by the optical time scale, the proposed Hyperbolic Quantum Processor does not require dilution refrigeration and offers a pathway to bring quantum computation to the realm of conventional engineering.
11:30 - 11:45 - The Effect Of Disorder On Optimal Quantum State Transfer In Nearest-Neighbor-Coupled Chains Oral [Show abstract]
  • Andrei Stepanenko, London Institute for Mathematical Sciences, Royal Institution, 21 Albemarle St, London W1S 4BS, UK, United Kingdom
  • Kseniia Chernova, School of Physics and Engineering, ITMO University, Saint Petersburg 197101, Russia, Russia
  • Maxim Gorlach, School of Physics and Engineering, ITMO University, Saint Petersburg 197101, Russia, Russia
Our recent results [arXiv:2501.11933] present a model example of time-optimal quantum state transfer in long chains of qubits. Here, we study the robustness of the optimal protocol against random fluctuations in the qubit eigenfrequencies and coupling control function. We show that fluctuations reduce fidelity, necessitating trajectory adjustments or alternative strategies.
11:45 - 12:00 - Birefringence-induced Topological Effects in Laser-written Quantum Photonics Oral [Show abstract]
  • Max Ehrhardt, McGill University, Canada
  • Matthias Heinrich, University of Rostock, Germany
  • Kai Wang, McGill University, Canada
  • Alexander Szameit, University of Rostock, Germany
We experimentally observe effects of topological origin imposed on quantum states of light in laser-written waveguide arrays. In particular, we demonstrate birefringence of waveguides as a powerful tool in the development of quantum photonic circuits with built-in topological protection. We find propagation-invariant quantum interference and entanglement conversion from polarization to orbital angular momentum as effects enabled and protected via tailored birefringence. Our findings may pave the way towards photonic quantum circuitry and scalable quantum computing protected and enabled by virtue of a next-generation of topological photonic devices.
12:00 - 12:30 - Quantum Plasmonic Metasurfaces for Efficient Generation and Control of Single Photon Emission Invited oral [Show abstract]
  • Christos Argyropoulos, The Pennsylvania State University, USA
We demonstrate compact quantum metasurfaces to efficiently generate and control single photon emission. Quasi-bound state in the continuum (q-BIC) plasmonic metasurfaces are realized to accomplish chiral single-photon emission. Efficient manipulation and control of non-classical two-photon interference is achieved with asymmetric composite metasurface designs operating in transmission mode. Spontaneous Parametric Down-Conversion (SPDC) and defects in solid-state ultrathin materials are utilized in combination with plasmonic metasurfaces to realize new quantum nanophotonic emitter configurations.
10:30 - Temporal Boundaries and Space-Time Interfaces

Session chairperson(s): Yakir Hadad; Sergey Bozhevolnyi

10:30 - 10:45 - Is It Possible To Have Mirrors From Temporal Boundaries? Oral [Show abstract]
  • J. Enrique Vázquez-Lozano, Universidad Pública de Navarra, Spain
  • Victor Pacheco-Peña, Newcastle University, UK
  • Iñigo Liberal, Universidad Pública de Navarra, Spain
We investigate the feasibility of mirrors without spatial boundaries. Due to Minkowski momentum conservation, conventional temporal boundaries prevent the realization of temporal mirrors. However, we show that non-Foster left-handed temporal boundaries, switching the medium's handedness and yielding anti-parallel momentum and energy flow, allows for temporal mirrors.
10:45 - 11:00 - Coherent Perfect Frequency Conversion and Dynamical Hong-Ou-Mandel Interference at Time-Interfaces Oral [Show abstract]
  • Emanuele Galiffi, Advanced Science Research Center, City University of New York, USA
  • Nikita Nefedkin, Advanced Science Research Center, Graduate Center, CUNY, United States
  • Sahitya Singh, Advanced Science Research Center, City University of New York, United States
  • Andrea Alu, Advanced Science Research Center, City University of New York, United States
We demonstrate how coherent illumination of a metamaterial undergoing a time-interface (i.e. an abrupt temporal variation of its constitutive properties) can be leveraged to realize frequency conversion with virtually unit efficiency, and how a similar strategy enables, at the quantum mechanical level, a dynamical analogue of the Hong-Ou-Mandel effect.
11:00 - 11:15 - Relativistic Electron Scattering at Uniform-Velocity Space-Time Interfaces Oral [Show abstract]
  • Furkan Ok, Katholieke Universiteit Leuven, Belgium
  • Christophe Caloz, Katholieke Universiteit Leuven, Belgium
We present relativistic electron scattering at uniform-velocity space-time interfaces in the subluminal regime. By applying Noether’s theorem and Lorentz transformations, we derive closed-form expressions for the reflected and transmitted energies and momenta. The resulting energy–momentum transition diversity offers opportunities for manipulating electron waves, surpassing pure-space or pure-time scattering processes. Our approach explores how adjustable modulation velocities and potentials can drive quantum electronic transport behaviors. This work paves the way for advanced space-time modulation strategies in electron systems.
11:15 - 11:30 - Evolution of Von Neumann Entropy Across Electromagnetic Time Interfaces Oral [Show abstract]
  • Mohammad Sajjad Mirmoosa, University of Eastern Finland, Finland
Temporal modulation of materials offers unprecedented control over light, sparking recent interest in the quantum theory of light interaction with time-varying materials. In this presentation, through the lens of quantum optics, we evaluate the von Neumann entropy transformation induced by an electromagnetic time interface, in which the refractive index of an isotropic, homogeneous, nondispersive dielectric medium uniformly undergoes an abrupt change in time. We demonstrate that the entropy increases across such an interface, with the magnitude of the increase correlating positively with the refractive index contrast. Additionally, we analyze how photon population in the incident modes governs entropy evolution. We hope that our study advances both the fundamental physics of time interfaces and their potential applications in quantum information technology.
11:30 - 11:45 - Retarded Argument Imposition: A Novel Approach for Solving Scattering Problems at Interfaces formed by Space-Time Modulations Oral [Show abstract]
  • Amir Bahrami, KU Leuven, Belgium
  • Christophe Caloz, KU Leuven, Belgium
We introduce a simple yet powerful method for solving scattering problems at nonuniform spacetime interfaces, slabs and wedges with complete generality. We explicitly derive and apply this approach to analyze moving perfect electric conductors. Additionally, we present illustrative scattering examples for penetrable interfaces, slabs and spacetime wedges, with their detailed mathematical treatment provided elsewhere. Finally, we extend the method to the inverse problem of arbitrary pulse shaping.
11:45 - 12:00 - Implementation of Photonic Time-Interfaces in an On-Chip Transmission-Line Metamaterial Oral [Show abstract]
  • Sahitya Singh, ASRC, City University of New York, USA
  • Andrea Alu, ASRC, City University of New York, USA
We design an on-chip switched transmission-line-metamaterial in 65nm CMOS technology to realize time-interfaces operating at higher frequencies up to ~2 GHz. CMOS technology offers transistor-based switches providing rise/ fall times of the order of 20 pico-seconds, enabling operation in the GHz range, hence paving a path for exploring other spatiotemporal wave phenomena.
12:00 - 12:30 - Space-Time Engineered Modulation (STEM) Elements Invited oral [Show abstract]
  • Christophe Caloz, KU Leuven, Belgium
  • Amir Bahrami, KU Leuven, Belgium
  • Klaas De Kinder, KU Leuven, Belgium
  • Zhiyu Li, Xi’an Jiaotong University,, China
Space-time systems can be classified into elements and media. This paper focuses on the former, describing the corresponding configurations—uniform or nonuniform—and presenting two application examples.
12:30 - 14:00 - Lunch break and Poster Session III (Wednesday)
12:30 - Poster session III

Session chairperson(s): Timo Gahlmann

1 - Wave Scattering by Isorefractive Bodies and $gamma$-Type Meta-Shells Poster [Show abstract]
  • Gregory Samelsohn, Shamoon College of Engineering, Israel
In this contribution, both direct and inverse scattering by isorefractive obstacles is addressed. Linear acoustics is chosen as an illustrative example, but the results are equally applicable to electromagnetic waves, at least for 2D setups with TM- or TE-polarized incident waves. Using the Bergmann substitution, it is shown that any homogeneous isorefractive body can be described by a delta-prime scattering potential, i.e., can emulate a pure $gamma$-type meta-shell. The strength of the potential depends on the density contrast. Numerical proof-of-principle simulations aimed at shape recovery of isorefractive scatterers confirm the expected double-ring pattern observed in the tomograms.
2 - Underwater Willis lens for broadband low-frequency sound focusing Poster [Show abstract]
  • Beomseok Oh, Pohang University of Science and Technology (POSTECH), Korea (South)
  • Dongwoo Lee, Pohang University of Science and Technology (POSTECH), Korea (South)
  • Yeon-Seong Choo, Ocean and Maritime Digital Technology Research Division, Korea Research Institute of Ships & Ocean Engine ering (KRISO), Korea (South)
  • Sung-Hoon Byun, Ocean and Maritime Digital Technology Research Division, Korea Research Institute of Ships & Ocean Engine ering (KRISO), Korea (South)
  • Sea-Moon Kim, Ocean and Maritime Digital Technology Research Division, Korea Research Institute of Ships & Ocean Engine ering (KRISO), Korea (South)
  • Junsuk Rho, Pohang University of Science and Technology (POSTECH), Korea (South)
Put your abstracBroadband underwater sound focusing in the low-frequency range is crucial for a wide array of applications, such as battery-free environmental monitoring and sensing. However, achieving low-frequency underwater focusing typically necessitates bulky, heavy structures that hinder practical deployment. In this work, we present a three-dimensional lens composed of cavity-based asymmetric scatterers, enabling a highly efficient design for manipulating low frequency waterborne sound through densely packed lattice configuration. We experimentally validate its broadband focusing performance over the 20-35 kHz range.
3 - Ventilated Sound Barrier based on Fano-like Interference with Central Discrete Paths Poster [Show abstract]
  • Seohyun Kim, Seoul National University of Science and Technology, Korea (South)
We propose a novel acoustic metamaterial based on Fano resonance, featuring a central double-helix discrete path surrounded by a continuous path for enhanced manufacturability and noise attenuation. The design is validated through theoretical analysis, numerical simulation, and experimental measurement, demonstrating effective noise reduction and practical applicability.
4 - Reconfigurable Wavefront Engineering Based On Timoshenko Beam Theory Poster [Show abstract]
  • Geon Lee, Pohang University of Science and Technology, Korea (South)
  • Junsuk Rho, Pohang University of Science and Technology, Korea (South)
This study presents a Timoshenko–Ehrenfest beam-based reconfigurable elastic metasurface, which enables multifunctional manipulation of elastic waves on a single substrate. This system allows easy reconfiguration to achieve various wave phenomena. The Timoshenko–Ehrenfest beam theory is employed for accurate analytical modeling. Both numerical simulations and experimental results validate this analytical approach, demonstrating its significant superiority.
5 - Tunable Topological Edge Modes in Phononic Crystals Through Light and Mechanical Actuation Poster [Show abstract]
  • Antonio Gliozzi, Politecnico di Torino , Italy
  • Federico Bosia, Politecnico di Torino , Italy
  • Emiliano Descrovi, Politecnico di Torino, Itali
  • Paolo Beoletto, Politecnico di Torino, Italy
  • Fabio Nistri, Politecnico di Torino, Italy
We present two complementary strategies for tuning topological edge modes in 1D phononic crystals based on the Su-Schrieffer-Heeger model. By exploiting light-responsive polymers and controlled mechanical deformation, we achieve reversible frequency shifts while preserving topological protection. Notably, asymmetric mechanical defects enable both red- and blueshifts of the frequency of the edge mode, offering enhanced tunability beyond what is achievable through illumination alone.
6 - A Novel Model Order Reduction Approach Based on Maximized Localization in Nonlinear Resonator Networks Poster [Show abstract]
  • Sima Zahedi Fard, AMOLF, Netherlands
  • Paolo Tiso, ETH Zurich, Switzerland
  • Marc Serra Garcia, AMOLF, Netherlands
Elastic metamaterials show promise for applications in processing information in matter with near-zero energy consumption. The very low energy dissipation in elastic materials has attracted scientists to design diverse microstructured devices. A large network of resonators serves as an excellent platform for designing devices such as information processors, logic gates, and sensors. However, designing highly sophisticated devices requires the development of complex geometries. Traditional finite element methods (FEM) become impractical due to the high number of degrees of freedom involved, especially when capturing the essential nonlinearities that enable device functionality. Linearizing these systems would eliminate their crucial nonlinear behavior, thereby making the devices nonfunctional. Consequently, an efficient and suitable nonlinear dynamic method is essential for effective device design. This research introduces a novel approach for designing heterogeneous nonlinear metamaterials based on maximally-localized basis functions (Wannier functions) combined with a nonlinear coordinate transformation. This method provides an efficient reduced-order modeling technique that facilitates the development of complex elastic microstructured networks.
7 - Mitigation of turbulence using triply periodic minimal surface-based structures. Poster [Show abstract]
  • Bastiaan Piest, Metamechanics, Computational Mechanical and Materials Engineering, University of Groningen, The Netherlands
  • Quentin Hopman, Metamechanics, Computational Mechanical and Materials Engineering, University of Groningen, The Netherlands
  • Kamiel Politiek, Metamechanics, Computational Mechanical and Materials Engineering, University of Groningen, The Netherlands
  • Pablo Druetta, Product Technology, University of Groningen, The Netherlands
  • Anastasiia Krushynska, Metamechanics, Computational Mechanical and Materials Engineering, University of Groningen, The Netherlamds
Flow-induced vibrations (FIV) present challenges in high-tech industries, particularly semiconductor manufacturing, where precision is paramount. This study examines the potential of triply periodic minimal surface (TPMS) structures in mitigating the underlying phenomena contributing to FIV within industrial cooling systems. By extending the Darcy-Forchheimer model to turbulent flow regimes, full-scale finite-element (FE) simulations were conducted on high-speed flows through a pipe with an abrupt expansion. The results indicate that TPMS inserts can significantly reduce turbulent kinetic energy (up to 97.6%) and vorticity (up to 32.7%), suggesting their efficacy in turbulence suppression.
8 - Dispersion Characteristics and Vibroacoustic Performance Analysis of Nonlinear Locally Resonant Metamaterials Poster [Show abstract]
  • Régis Boukadia, KU Leuven, Belgium
  • Wim Desmet, KU Leuven, Belgium
  • Elke Deckers, KU Leuven, Belgium
This contribution proposes a novel method for computing the dispersion curves and band diagrams of nonlinear metamaterials featuring analytical nonlinearities. The proposed method is applied to locally resonant metamaterials with geometrically nonlinear resonators, and their vibroacoustic performance is assessed.
9 - Microlattices with tailored properties as thermoplastic composite sandwich cores Poster [Show abstract]
  • Camill de Vos , NLR – Netherlands Aerospace Centre, Netherlands
  • Ingmar Pragt, NLR – Netherlands Aerospace Centre, Netherlands
  • David Bal , NLR – Netherlands Aerospace Centre, Netherlands
  • Wessel W. Wits , NLR – Netherlands Aerospace Centre, Netherlands
  • Ruud P.G. Veul , NLR – Netherlands Aerospace Centre, Netherlands
<p> Carbon microlattices demonstrate potential as substitutes for traditional honeycomb cores in aerospace applications due to their exceptional combination of ultra-low weight, high compression strength and stiffness. Integrating them into thermoplastic composite structures could be one of their first industrial applications. This study demonstrates that composites with carbon core materials can be realised and that carbon microlattices can be produced at a larger scale using commercially available stereolithography and sintering equipment.</p>
10 - Wave propagation in an elastic lattice with nonreciprocal stiffness and damping Poster [Show abstract]
  • Harshit Kumar Sandhu, Indian Institute of Science, Bengaluru, India
  • Saurav Dutta, Indian Institute of Science, Bengaluru, India
  • Rajesh Chaunsali, Indian Institute of Science, Bengaluru, India
Wave control through non-reciprocity enables directional energy localization and asymmetric wave propagation, offering new possibilities for manipulating mechanical waves. This study investigates the combined effects of non-reciprocal stiffness and damping in one-dimensional elastic lattices. While non-reciprocal damping governs wave-number-dependent asymmetry in frequency and attenuation, its combination with stiffness asymmetry leads to remarkable phenomena such as unidirectional amplification accompanied by asymmetric group velocities. Our findings offer new strategies for designing elastic metamaterials with tunable wave propagation and applications in topological mechanics and wave-based technologies.
11 - Effects of Negative Poisson's Ratio on the Viscoelastic Behaviour of Sandwich Beams Poster [Show abstract]
  • Simon Preston, Univerversity of Exeter, United Kingdom
  • Julain Londoño-Monsalve , Univerversity of Exeter, United Kingdom
  • Ken. E. Evans, Univerversity of Exeter, United Kingdom
Auxetic viscoelastic materials enhance energy dissipation and damping in structural applications, their impact on sandwich beams remains underexplored. This study examines how auxeticity affects stress–strain response and stiffness in single-, three-, and five-layer beams. A Prony series models the time-dependent modulus, with analytical predictions compared to finite element analysis (FEA). Results show that greater auxeticity improves energy dissipation and reduces stress in multi-layered beams, though extreme values introduce modelling discrepancies. These findings aid in optimising auxetic viscoelastic materials for vibration damping and structural applications.
12 - Electrostriction Control in Metamaterials: Enhancement and Suppression in a Silicon-Based System Poster [Show abstract]
  • Cumali Sabah, METU NCC, Turkey
  • Omid Khakpour , ,
  • B. Yang , ,
  • R. Rahighi , ,
Electrostriction in metamaterials is a crucial phenomenon influencing their electromechanical properties. This study investigates the enhancement and suppression of electrostriction in a metamaterial system where silicon (Si) serves as the background medium, and 35 different inclusions are considered. The results indicate that specific inclusions, such as As₂S₃, CuCl, and KI, enhance electrostriction, whereas others like diamond, MgO, and YAG suppress it. Furthermore, we performed the analysis at different frequencies and found that both enhancement and suppression of electrostriction are frequency independent. The findings provide insights into designing tunable metamaterials for advanced applications in optics and photonics.
13 - Time-varying Aubry–André Model: FDTD Simulations Poster [Show abstract]
  • Takamichi Terao, Gifu university, Japan
This study introduces a time-domain model analogous to the localized-delocalized transition in one-dimensional systems. Using the finite-difference time-domain (FDTD) method, the study found no corresponding transition, highlighting that spatial and time-domain correspondences are not always valid.
14 - Temporal Metamaterials In The Space-Harmonic Approach Poster [Show abstract]
  • Mariana Dalarsson, KTH Royal Institute of Technology, Sweden
  • Balwan Rana, KTH Royal Institute of Technology, Sweden
  • Victor Pacheco-Pẽna, Newcastle University, United Kingdom
In this work, we propose the space-harmonic method to study graded temporal multistepped metamaterials, described using periodic mathematical functions. Exact analytical solutions for the fields are obtained and analyzed. The space-harmonic analysis of temporally periodic metamaterials is the dual of the time-harmonic analysis of spatially periodic metamaterials, previously studied by one of the present authors.
15 - Large Complete Momentum Gaps in Dispersive Media with Temporal Modulation Poster [Show abstract]
  • Yao-Ting Wang, National Sun Yat-sen University, Taiwan
  • Yu-Huei Chen, National Sun Yat-sen University, Taiwan
This study investigates the formation of large complete k-gaps in Lorentzian media with time-periodic plasma frequency modulation. We identify a substantial k-gap whose width remains nearly unchanged with increasing resonance frequency. Numerical analyses indicate that the k-gap emerges when the modulation frequency approaches the unmodulated plasma frequency. This phenomenon suggests applications in non-Hermitian physics and gain mechanisms.
16 - Topological Temporal Boundary States In A Non-Hermitian Spatial Crystal Poster [Show abstract]
  • Wenjie Chen, Sun Yat-sen University, China
We find that the presence of TTBS is not limited to the temporally periodic systems. A crystal with spatially periodic non-Hermiticity is another mechanism to achieve momentum gaps. Intriguingly, a sudden sign flip of the non-Hermiticity triggers a topological transition for the momentum gap, resulting in the emergence of a TTBS that peaks at the flipping instance. Unlike the traditional TTBS, this phenomenon does not require constantly modulating to material properties, instead it is achieved with a single time-dependent operation: a single flip in non-Hermiticity. Its robustness against perturbation and disorder is demonstrated in both simulations and experiments.
17 - Optical Response By Time-Varying Plasmonic Nanoparticles Poster [Show abstract]
  • Miguel Verde Ruiz, Universidad Autónoma de Madrid, Spain
  • Paloma Arroyo Huidobro, Universidad Autónoma de Madrid, Spain
We study the optical response of plasmonic nanoparticles whose frequency-dispersive permittivity is periodically modulated in time. We show that the modulation gives rise to Floquet replicas of the localized surface plasmon resonance, whose behavior can be described using a two-band model that captures the observed phenomenology while providing analytical insight.
18 - Advanced numerical modeling for time-modulated metasurfaces Poster [Show abstract]
  • Mahmoud Elsawy, Université Côte d’Azur, Inria, CNRS, LJAD, France
  • Roman Gelly, Université Côte d’Azur, Inria, CNRS, LJAD, France
  • Stéphane Lanteri, Université Côte d’Azur, Inria, CNRS, LJAD, France
The overarching goal of this work is to propose and develop a novel numerical methodology for the design of time-modulated metasurfaces. Here, we present a first step in this direction with the introduction of a Discontinuous Galerkin (DG) method for the solution of time-domain Maxwell's equations for time-varying materials.
19 - Cross-Phase Modulation via Time-varying epsilon-near-zero metasurface Poster [Show abstract]
  • Rakesh Dhama, Tampere University, Finland
  • Imran Hossain, Tampere University, Finland
  • Jesse Pietila, Tampere University, Finland
  • Humeyra Caglayan, Tampere University, Finland
We demonstrate the cross-phase modulation (XPM) in the time-varying ENZ metasurface for the first time by exciting beyond epsilon near zero region. Our designed metasurface comprised of gold nanostructures designed on ITO film with specific size, shape, and periodicity has been designed to enhance the absorption towards both side of the ENZ window. Our degenerate and non-degenerate ultrafast pump-probe experiments compare the frequency shift via XPM with AFC and report the large tunable and broadband frequency shift up to 65 nm via cross-phase modulation.
20 - Extreme acoustic wave guiding using time varying non-local media Poster [Show abstract]
  • Fabio Nistri, Politecnico di Torino, Italy
  • Paolo Beoletto, Politecnico di Torino, Italy
  • Gregory Chaplain, University of Exeter, United Kingdom
  • Timothy Starkey, University of Exeter, United Kingdom
  • Simon Horsley, University of Exeter, United Kingdom
As already demonstrated in acoustics, media with time-varying impedance can enable novel wave manipulation phenomena, such as frequency conversion and temporal scattering. In this work, we show that introducing time-varying non-local couplings in a medium can produce similar wave manipulation effects. By exploiting roton-like dispersion relations resulting from non-local coupling, we achieve extreme wave steering phenomena, including total temporal reflection for wavelengths associated with negative group velocity. In this study, we provide numerical evidence of these phenomena and demonstrate their applicability to non-local systems that support surface acoustic wave propagation.
21 - Shock Waves in Nonlinear Transmission Lines Poster [Show abstract]
  • Eugene Kogan, Bar-Ilan University, Israel
In the first half of the paper we consider interaction between the small amplitude travelling waves (”sound”) and the shock waves in the transmission line containing both nonlinear capacitors and nonlinear inductors. We calculate the ”sound” wave coefficient of reflection from (coefficient of transmission through) the shock wave. These coefficients are expressed in terms of the speeds of the ”sound” waves relative to the shock and the wave impedances. In the second half of the paper we explicitly include into consideration the dissipation in the system, introducing ohmic resistors shunting the inductors and also in series with the capacitors. This allows us to justify the conditions on the shocks, postulated in the first half of the paper. This also allows us to describe the shocks as physical objects of finite width and study their profiles, same as the profiles of the waves closely connected with the shocks - the kinks. The profiles of the latter, and in some particular cases the profiles of the former, were obtained in terms of elementary functions.Put your abstract here
22 - Kinetic Inductance Tuning of Superconducting Wire: Towards Tunable ENZ Metamaterial for Dark Matter Search Poster [Show abstract]
  • Jingan Cai, University of Maryland, USA
  • Steven Anlage, University of Maryland, United States
We measure and model the kinetic inductance and microwave loss of a thin superconducting wire for use in a current-tunable ENZ plasmonic metamaterial for dark matter search. A dc current is found to tune the kinetic inductance of a superconducting wire, which enables electronic variation of the plasma frequency of a wire array.
23 - Tailored States of RF SQUID Metamaterials Through Controlled Counter-Disorder Poster [Show abstract]
  • Jingnan Cai, University of Maryland, USA
  • Steven Anlage, University of Maryland, United States
We explore the use of artificially-imposed counter-disorder in an attempt to overcome the effects of quenched-disorder and modify the behavior of an rf-SQUID superconducting-metamaterial in a controlled manner. The measurements are performed in a laser scanning microscope to both image the currents in the SQUIDs and perturb the Josephson junctions.
24 - Speeding Up Quantum State Transfer In A Three-Qubit Chain Poster [Show abstract]
  • Kseniia Chernova, School of Physics and Engineering, ITMO University, Saint Petersburg 197101, Russia
  • Andrei Stepanenko, London Institute for Mathematical Sciences, Royal Institution, 21 Albemarle St, London W1S 4BS, UK
  • Maxim Gorlach, School of Physics and Engineering, ITMO University, Saint Petersburg 197101, Russia
Efficient state transfer in quantum systems is crucial for advancing quantum communication. We apply the quantum brachistochrone method to find a time-optimal state transfer in a fully connected array of three qubits. By leveraging multi-path interference, we demonstrate that multi-path evolution reduces transfer time compared to the single-path protocols.
25 - Roadmap for focused ion beam technologies Poster [Show abstract]
  • Katja Höflich, Ferdinand-Braun-Institut, Germany
  • Gerhard Hobler, TU Wien, Austria
  • Frances Allen, University of California, Berkley, USA
  • Tom Wirtz, Advanced Instrumentation for Nano-Analytics (AINA), Luxembourg
  • Gemma Rius, Institut de Microelectrònica de Barcelona, Spain
  • Gregor Hlawacek, Institute of Ion Beam Physics and Materials Research, Germany
<p> Focused ion beams are key to cutting-edge research! They drive analysis, optimize materials or devices and enable sophisticated nanoscale structuring without the need for a mask. This poster presents the roadmap for focused ion beam technologies, combining a comprehensive survey of the field with a future perspective for research and development.</p>
14:00 - 15:30 - Oral Sessions (Wednesday Afternoon 1)
14:00 - Special session: Metamaterials and Information II

Organizer(s): Nader Engheta; Romain Fleury

Session chairperson(s): Romain Fleury; Nader Engheta

14:00 - 14:30 - Analog neural networks with waves Invited oral [Show abstract]
  • Romain Fleury, EPFL, Switzerland
  • Ali Momeni, EPFL, Switzerland
Rethinking training and inference in artificial neural networks within the constraints of the underlying hardware physics may enable the development of power-efficient and scalable neural-like architectures, known as physical or analog neural networks. These networks leverage analog physical systems—such as optical platforms—to perform computation. Here, we discuss the advantages of using alternative substrates beyond conventional electronic hardware and examine the trade-offs between various training strategies for analog neural networks, including both backpropagation-based methods and backpropagation-free, local learning approaches.
14:30 - 15:00 - Physical computing in elastic metamaterials Invited oral [Show abstract]
  • Marc Serra-Garcia, AMOLF, Netherlands
The talk will provide an overview of our recent progress in information processing in metamaterials, including the physical realization of machine learning models for speech recognition, elastic information storage, digital computation and self-learning systems.
15:00 - 15:30 - Panel Discussion Round Table Discussion [Show abstract]
  • Nader Engheta, University of Pennsylvania, USA
  • Andrea Alù, City University of New York, USA
  • Humeyra Caglayan, Eindhoven University of Technology, The Netherlands
  • Jason Valentine, Vanderbilt University, USA
  • Romain Fleury, EPFL, Switzerland
  • Marc Serra Garcia, AMOLF, The Netherlands
panel discussion chaired by Nader Engheta and Romain Fleury
14:00 - Novel Applications in Sensing and Diagnostics

Session chairperson(s): Jacob Khurgin; Giuseppe Strangi

14:00 - 14:15 - Inductive Sensing of Lung Conductivity for Fluid Accumulation Detection Oral [Show abstract]
  • Georgiana Dima, University of Oxford, United Kingdom
  • Anna Radkovskaya, University of Oxford, United Kingdom
  • Laszlo Solymar, University of Oxford, United Kingdom
  • Ekaterina Shamonina, University of Oxford, United Kingdom
This study explores a non-invasive inductive sensing method for detecting lung conductivity variations due to the presence of water. Using CST Microwave Studio, the resonant frequency and the quality factor changes of a single resonant element are monitored as lung conductivity is varied to simulate fluid infiltration. The resolution of a standard Vector Network Analyzer (VNA) is compared to the range of changes detected. Noticeable changes are recorded, which support the inductive sensing technique for non-invasive lung fluid monitoring.
14:15 - 14:30 - A Robust Miniaturized Multi-Chip Module with Wireless Data and Power Transfer for Precise and Safe Tinnitus Therapy Oral [Show abstract]
  • Alireza Nikzamir, University of California Irvine, USA
  • Yaoyu Cao, University of California Irvine, USA
  • Behnam Moradi, University of California Irvine, USA
  • Pooya Khosravi, University of California Irvine, USA
  • Hamid Djalilian, University of California Irvine, USA
  • Michael Green, University of California Irvine, USA
A miniaturized multi-chip module (MCM), designed for safe and efficient electrical stimulation of the inner ear, is proposed to treat tinnitus. The system features advanced circuit designs, including a novel charge-balance mechanism, that enables precise, customizable current waveforms alongside wireless power and data transfer (WPDT). To meet the stringent size requirements for implantation in the ear, the system was fabricated using the TSMC 180 nm BCD technology and incorporates small-form-factor coils, each with a radius of 2.5 mm. This compact design ensures reliability, minimal invasiveness, and compatibility with the anatomy of the inner ear. Performance testing using both biological and circuit models under various conditions validates the WPDT effectiveness, highlighting its potential as an innovative solution for tinnitus therapy.
14:30 - 14:45 - The Optimal Design of Terahertz Metasurface for Ultrasensitive Biosensor Oral [Show abstract]
  • Pradeep tiwari, Institute of High Pressure Physics PAS, Poland
We present a novel H-split terahertz metasurface with 800 GHz/RIU sensitivity on a PMP substrate, surpassing Fano sensors. The reason for the enhanced sensitivity is the smaller mode volume and stronger field confinement. Experimental BSA detection confirms superior light–matter interaction, establishing an optimal design and substrate for ultrasensitive terahertz biosensing.
14:45 - 15:00 - Bio-inspired meta-sensor for speech recognition Oral [Show abstract]
  • Paolo Han Beoletto, Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi, 24 - 10129, Torino, Italy, Italy
  • Gianluca Milano, INRiM (Istituto Nazionale di Ricerca Metrologica), Advanced Materials Metrology and Life Science Division, Strada delle Cacce 91 - 10135, Torino, Italy, Italy
  • Carlo Ricciardi, Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi, 24 - 10129, Torino, Italy, Italy
  • Federico Bosia, Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi, 24 - 10129, Torino, Italy, Italy
  • Antonio Stefano Gliozzi, Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi, 24 - 10129, Torino, Italy, Italy
We propose a bioinspired metasensor for speech recognition, mimicking the human cochlea with a spiral-shaped elastic metamaterial resonator. The device extracts speech features for classification, acting both as sensor and computing unit. Processing auditory signals in-sensor ensures reduced power consumption, with significant potential for IoT and edge AI applications.
15:00 - 15:30 - Metasurface-Enhanced Photothermal Imaging and High-Sensitivity Biomolecular Detection Invited oral [Show abstract]
  • Siying Peng, School of Engineering, Westlake University, China
Photothermal heterodyne imaging (PHI) is a widely used label-free imaging technique for visualizing chemical bonds. It offers advantages such as high resolution, non-cytotoxicity and imaging in the water environment. However, the inherently low absorption cross-section of molecules limits photothermal signal strength, thereby constraining sensitivity. To address this challenge, we introduce a metasurface-integrated photothermal heterodyne imaging system (M-PHI). By leveraging the near-field enhancement effect of metasurface, the system significantly enhances the absorption cross-section and photothermal signals of molecules. The M-PHI system achieves over 12-fold enhancement in imaging intensity, enabling the detection of biomolecules at concentrations below 400 nM without any surface functionalization. The M-PHI system opens new avenues for ultrasensitive imaging of molecules, with potential applications in biology, clinical medicine, and materials science.
14:00 - Topological, Nonreciprocal, and Programmable Metamaterials

Session chairperson(s): Christos Argyropoulos; Filiberto Bilotti

14:00 - 14:30 - Complex spectrum analysis of QVHE phononic waveguides using QNM expansion Invited oral [Show abstract]
  • Marc Martí Sabaté, Imperial College London, United Kingdom
  • Richard Wiltshaw, Imperial College London, United Kingdom
  • Benjamin Vial, Imperial College London, United Kingdom
  • Sébastien Guenneau, Imperial College London, United Kingdom
  • Richard Craster, Imperial College London, United Kingdom
QVHE edge states emerge at the boundary between two infinite topologically nontrivial media with chiral properties. However, in practical applications, the designed metastructures are finite and exist in an open domain, causing deviations in the device’s spectral properties from the ideal infinite band structure. In this talk, we will characterize the distribution of quasinormal modes (QNMs) that play a key role in the emergence of interface states within these finite waveguided structures.
14:30 - 14:45 - 3D Metamaterials with Elastic Non-reciprocity Oral [Show abstract]
  • Qingxiang Ji, FEMTO-ST, CNRS, Université Marie et Louis Pasteur, France
  • Jinliang Wang , Harbin Institute of Technology, China
  • Brahim Lemkalli , Université Marie et Louis Pasteur, Institut FEMTO-ST, CNRS, France
  • Gwenn Ulliac , Université Marie et Louis Pasteur, Institut FEMTO-ST, CNRS, France
  • Muamer Kadic , Université Marie et Louis Pasteur, Institut FEMTO-ST, CNRS, France
Elastic metamaterials have recently driven significant advancements in static mechanics and wave propagation. In this study, we demonstrate an unusual nonreciprocal elastic behavior for both static states and dynamic elastic waves in elastic metamaterials. The non-reciprocity is validated by simulations and experiments. This peculiar behavior enables unidirectional elasticity and wave transmission within a solid structure, e.g., nonlinear and nonreciprocal elastic modulus, and tunable response amplitudes in elastic waves.
14:45 - 15:00 - Steering Nonreciprocity using Nonlinear Waves Oral [Show abstract]
  • Bertin Many Manda, School of Mechanical Engineering, Tel Aviv University, Israel
  • Sayan Jana, School of Mechanical Engineering, Tel Aviv University, Israel
  • Vassos Achilleos, Acoustics Laboratory, Le Mans University, France
  • Dimitri Frantzeskakis, Department of Physics, National and Kapodistrian University of Athens, Greece
  • Lea Sirota, School of Mechanical Engineering, Tel Aviv University, Isreal
Non-Hermitian systems with nonreciprocal couplings are currently attracting considerable attention due to their ability to exhibit exotic wave phenomena like the unidirectional wave amplification, known as the non-Hermitian skin effect (NHSE). I will investigate the effects of nonlinearity in the wave dynamics of nonreciprocal systems. I will first extend the NHSE into the nonlinear regime. Then, considering more realistic scenarios where dissipative effects are non-negligible, I will showcase a novel control mechanism in which nonlinearity mediates the interplay between nonreciprocity and dissipation as well as dispersion. As a result, we can generate long-lived nonlinear pulses (i.e., solitons) that propagate unidirectionally within an otherwise NHSE-dominated phase. Finally, I will present experimental results that support these theoretical predictions, offering a practical realization of nonlinearity-controlled nonreciprocal wave dynamics.
15:00 - 15:15 - Programmable Optomechanical Logic Circuits Oral [Show abstract]
  • Xiaofei Guo, AMOLF, Netherlands
  • Jonne Drost, AMOLF, Netherlands
  • Jesse Slim, The University of Queensland, Australia
  • Fons van der Laan, AMOLF, Netherlands
  • Marc Serra Garcia, AMOLF, Netherlands
  • Ewold Verhagen, AMOLF, Netherlands
In this paper, we explore information processing functionalities in optomechanical systems using laser-induced mechanical nonlinearities. We demonstrate programmable logic gates in a single nanomechanical resonator, where different logic operations can be dynamically selected by adjusting laser parameters. Additionally, by coupling multiple mechanical modes within one resonator structure, we achieve cascadable logic gates, paving the way to programmable optomechanical computing networks.
15:15 - 15:30 - Experimental Design of Bistable Meta-panel for Dynamic Investigation Oral [Show abstract]
  • Valeria Cavanni, Politecnico di Torino, Italy
  • Gaetano Miraglia, Politecnico di Torino, Italy
  • Linda Scussolini, Politecnico di Torino, Italy
  • Andrea De Marchi, Politecnico di Torino, Italy
  • Luca Caneparo, Politecnico di Torino, Italy
  • Rosario Ceravolo, Politecnico di Torino, Italy
Bistable metamaterials offer a promising solution for vibration mitigation in structural systems. This research presents the conceptualization of the experiments for a bistable meta-panel, which uses geometric nonlinearity and snap-through instability to enhance energy absorption and dissipation. A scaled prototype, produced via additive manufacturing, undergoes static and dynamic testing to assess its response. This work provides a foundation for further development of meta-material-based seismic protection systems.
14:00 - Quantum Plasmonics and Nanophotonics

Session chairperson(s): Ewold Verhagen; Angela Vasanelli

14:00 - 14:30 - Quantum Effects in Nanophotonic Light–Matter Interactions Invited oral [Show abstract]
  • P. André Gonçalves, University of Southern Denmark, Denmark
Advances in fabrication and spectromicroscopy techniques have enabled unprecedented access to quantum mechanical effects underlying various nanophotonic phenomena, challenging their description solely within classical electrodynamics. Here, I will present a suite of quantum-informed theoretical frameworks for accurately describing light–matter interactions in nanophotonics and discuss how these approaches provide new insights and unlock new capabilities. Topics will include quantum corrections to plasmon spectra and plasmon-enhanced light–matter interactions, as well as the exploration of quantum effects governing electron–light–matter interactions in various electron-beam-based spectroscopies of current interest.
14:30 - 14:45 - Canonical Quantisation Of Electromagnetic Fields Around Dispersive Dielectric Structures Oral [Show abstract]
  • Jakub Skorka, University of Birmingham, United Kingdom
  • Zoltan Sztranyovszky, University of Birmingham, United Kingdom
  • Ben Yuen, University of Birmingham, United Kingdom
  • Angela Demetriadou, University of Birmingham, United Kingdom
Coupling quantum emitters to plasmonic nanostructures is of increasing interest, motivated by possible applications. However, its theoretical description is challenging due to material dispersion, Ohmic losses, and radiation. We present a modes-of-the-universe quantisation of electromagnetic fields in the presence of structures made of dispersive, lossless media.
14:45 - 15:00 - Causality and the Second Quantisation of Open Nanophotonic Systems Oral [Show abstract]
  • Luke Hands, University Of Birmingham, United Kingdom
  • Ben Yuen, University of Birmingham, United Kingdom
  • Angela Demetriadou, University of Birmingham, United Kingdom
Describing systems consisting of quantum emitters coupled to complex radiative nanophotonic geometries is challenging. We present a method that provides an exact and complete second quantisation scheme through the use of complex pseudomodes, and discuss the emergence of causality and non-Markovian dynamics in the spectrum of the quantum dynamics obtained.
15:00 - 15:15 - Quantum Dynamics in Coupled Plasmonic Nanocavities Oral [Show abstract]
  • Ishita Jena, University of Birmingham, United Kingdom
  • Angus Crookes, University of Birmingham, United Kingdom
  • Ben Yuen, University of Birmingham, United Kingdom
  • Angela Demetriadou, University of Birmingham, United Kingdom
Plasmonic nanocavities facilitate strong coupling with few or even a single quantum emitter (QE) at room temperature. We introduce a new design with two coupled nanocavities, placed several micrometers apart and each hosting a QE. This allows for separate excitation and control of each QE. We report that the nanocavity coupling leads to different plasmonic interaction regimes that directly impact the quantum dynamics. Such systems pave the way for the generation of quantum states using nanoplasmonic cavities.
15:15 - 15:30 - Double Helical Antennas for Direct Coupling to Quantum Emitters or Plasmonic Waveguides Oral [Show abstract]
  • Aleksei Tsarapkin, Ferdinand-Braun-Institut, Germany
  • Luka Zurak, University of Würzburg, Germany
  • Krzysztof Maćkosz, Empa, Switzerland
  • Lorenz Löffler, University of Würzburg, Germany
  • Victor Deinhart, Ferdinand-Braun-Institut, Germany
  • Ivo Utke, Empa, Switzerland
  • Thorsten Feichtner, University of Würzburg, Germany
  • Katja Höflich, Ferdinand-Braun-Institut, Germany
Plasmonic double helix antennas combine large chiroptical interaction strength with highly directional light emission at the nanoscale. Here, such antennas are designed with a semi-analytical design tool and fabricated by direct electron beam writing. The realized antennas exhibit a large and broadband dissymmetry factor in the visible range.
14:00 - Tunable, Dynamic, and Programmable Metasurfaces

Session chairperson(s): Christophe Caloz; Tsampikos Kottos

14:00 - 14:30 - The promise of programmable optical metasurfaces Invited oral [Show abstract]
  • Laura Na Liu, University of Stuttgart, Germany
In this talk, we will explore the forefront of metasurface-based display systems, focusing on programmable metasurfaces designed for dynamic holographic displays.
14:30 - 14:45 - Creation and Manipulation of Scattering Singularities with Tunable Metasurfaces Oral [Show abstract]
  • Jared Erb, University of Maryland, USA
  • Isabella Giovannelli, University of Maryland, United States
  • Nadav Shaibe, University of Maryland, United States
  • Tsampikos Kottos, Wesleyan University, United States
  • Steven Anlage, University of Maryland, United States
We utilize metasurfaces to take parametric control of the scattering properties of a variety of complex and over-moded scattering systems, and discover rich topological structure and dynamics of a wide variety of scattering singularities. These singularities have topological stability, can all be associated with diverging time delays, and obey conservation laws.
14:45 - 15:00 - Electro-active Metasurfaces Controlling Exceptional Topological Phase through Low-voltage Operation on Conductive Polymer Oral [Show abstract]
  • Jaekyung Kim, POSTECH, Korea (South)
We investigate an electro-active chiral optical response-driven dual-channel metasurfaces with fast electrical switching rates of 52 ms, and a low operating voltage of 0.5 V. The combination of polyaniline thin film and the exceptional topological phase of chiral gold meta-atoms modulate holographic images through the applied voltage and the polarization of the incident light simultaneously.
15:00 - 15:30 - Electro-Optic Spatiotemporal Nonlocal Metasurfaces Invited oral [Show abstract]
  • Sergey Bozhevolnyi, University of Southern Denmark, Denmark
Spatiotemporal light control with dynamic optical metasurfaces has been high on the research agenda, promising attractive solutions and new avenues for modern highly integrated optics and nanophotonics. Here, several promising electro-optic metasurface configurations are presented that exploit nonlocal interactions between incident radiation and grating-excited waveguide modes propagating inside nm-thin electro-optic films. Challenges and opportunities for spatiotemporal light control with electro-optic nonlocal metasurfaces are discussed, outlining also future developments towards tackling the most serious challenges and exploiting the most exciting opportunities.
15:30 - 16:00 - Coffee Break (Wednesday Afternoon)
16:00 - 17:30 - Oral Sessions (Wednesday Afternoon 2)
16:00 - Metasurfaces for Signal Processing and Information Theory

Session chairperson(s): Jason Valentine; Marc Serra Garcia

16:00 - 16:30 - Application of the metasurface aided signal processing concept in wireless communications and radar systems Invited oral [Show abstract]
  • Filiberto Bilotti, ROMA TRE University, Italy
  • Mirko Barbuto, ROMA TRE University, Italy
  • Michela Longhi, Niccolò Cusano University, Italy
  • Alessio Monti, ROMA TRE University, Italy
  • Davide Ramaccia, ROMA TRE University, Italy
  • Alessandro Toscano, ROMA TRE University, Italy
  • Stefano Vellucci, Niccolò Cusano University, Italy
We review our recent work on applying the metasurface-aided signal processing concept to wireless, short-range, and satellite communication, as well as radar systems. The ability to control in real time the properties of metasurfaces operating at microwave and millimeter-wave frequencies – using PIN or varactor diodes driven by a programmable FPGA – unlocks unprecedented performances in terms of reduced complexity, lower costs, decreased computation time, and minimized latency, which are key aspects for transforming and revolutionizing next-generation communication and radar systems. Specifically, we demonstrate how the integration of conventional antennas with intelligent metasurfaces enables the development of innovative smart antennas, leading to enhanced coverage and multi-channel operation in wireless communications, ultra-low latency and near-zero power consumption in short-range IoT systems, and improved beam shaping and steering in satellite communications. Regarding radar systems, we show how time- or/and frequency-modulated metasurfaces can execute a variety of advanced functions – including direction-of-arrival estimation, Doppler effect compensation, deceptive jamming with false targets, radar cross-section manipulation, and pseudo-random coded electronic counter-countermeasures – without relying on complex and time-consuming digital signal processing algorithms. This enables electronic countermeasures and counter-countermeasures at the speed of light through the direct manipulation of electromagnetic waves.
16:30 - 16:45 - Meta-atom Phase Extraction Based on Frequency-Manipulating Metasurface Oral [Show abstract]
  • Qun Yan Zhou, southeast university, China
  • Jia Chen Wang, southeast university, China
  • Jun Wei Wu, southeast university, China
  • Shuo Liu, southeast university, China
  • Huidong Li, southeast university, China
  • Jun Yan Dai, southeast university, China
  • Qiang Cheng, southeast university, China
Generally, metasurfaces' passive structure couples meta - atom phase info, hampering independent extraction. We propose a frequency-manipulating metasurface method for decoupling and rapid extraction. Verified by theory and simulation.
16:45 - 17:00 - Integrated Sensing and Communication via Space-Time-Coding Metasurfaces Oral [Show abstract]
  • Xiao Qing Chen, Southeast University, China
  • Lei Zhang, Southeast University, China
  • Yi Ning Zheng, Southeast University, China
  • Shuo Liu, Southeast University, China
  • Zhuo Ran Huang, Southeast University, China
  • Jing Cheng Liang, Southeast University, China
  • Marco Di Renzo, Université Paris-Saclay, CNRS, CentraleSupélec, France
  • Vincenzo Galdi, University of Sannio, Italy
  • Tie Jun Cui, Southeast University, China
This study explores integrated sensing and communication using space-time-coding metasurfaces to control electromagnetic waves for both wireless communication and sensing, eliminating the need for extra sensors. A 2-bit prototype at microwave frequencies demonstrated real-time reconfigurability, ensuring stable communication even with a moving transmitter.
17:00 - 17:30 - Recent Advances in Collaborative Information and Power Metasurfaces Invited oral [Show abstract]
  • Long Li, Xidian University, China
  • Dexiao Xia, Xidian University, China
  • Yicen Li, Xidian University, China
  • Xiangjin Ma, Xidian University, China
  • Xin Wang, Xi’an University of Posts and Telecommunications, China
  • Yajie Mu, Xidian University, China
  • Hao Xue, Xidian University, China
  • Haixia Liu, Xidian University, China
  • Jiaqi Han, Xidian University, China
  • Lianlin Li, Peking University, China
  • Qiang Cheng, Southeast University, China
  • Tie Jun Cui, Southeast University, China
The rapid development of metasurface has revolutionized the way we approach wireless communication and power transfer. This paper introduces the concept of collaborative information and power metasurfaces, which represents a significant advancement over traditional simultaneous wireless information and power transmission systems.
16:00 - Metamaterials for Novel Microscopy and Photodetectors

Session chairperson(s): Siying Peng; Giuseppe Strangi

16:00 - 16:30 - Optical Metagrating for Light Sheet Microscopy Invited oral [Show abstract]
  • Maryna Meretska, Karlsruhe Institute of Technology, Germany
Oblique Plane Microscopy (OPM) is notable for its fast scanning capabilities. It relies on conventional gratings, which suffer from low deflection efficiency at steep angles. We designed and optimized a metagrating that achieved a more than 40% increase in light deflection efficiency compared to conventional gratings for OPM setup.
16:30 - 16:45 - Building a high-resolution image from super-pixels Oral [Show abstract]
  • Benquan Wang, Nanyang Technological University, Singapore
  • Jin-Kyu So, Nanyang Technological University, Singapore
  • Eng Aik Chan, Nanyang Technological University, Singapore
  • Ruyi An, Nanyang Technological University, Singapore
  • Yewen Li, Nanyang Technological University, Singapore
  • Zexiang Shen, Nanyang Technological University, Singapore
  • Bo An, Nanyang Technological University, Singapore
  • Giorgio Adamo, Nanyang Technological University, Singapore
  • Nikolay I. Zheludev, University of Southampton, UK
We provide the first demonstration of a label-free far-field optical microscopy with resolution of ~λ/11. Using the prior knowledge of light diffraction patterns from super-pixels of subwavelength size we build the image by scanning a focused beam of light across the object and reconstructing it from the diffraction patterns.
16:45 - 17:00 - CMOS-Oriented Concept For A Metasurface Enhanced Back-Side Illuminated SWIR Photodetector Oral [Show abstract]
  • Lion Augel, Brandenburg University of Technology, Germany
  • Jens Knobbe, Fraunhofer Institute for Photonic Microsystems IPMS, Germany
Detection of short-wave infrared radiation by Schottky photodetectors offers compatibility to complementary metal-oxide-semiconductor technology but suffers from low detection efficiency. The presented concept aims at combining the current knowledge in the field of plasmonic “hot carrier” enhanced Schottky photodetectors using a buried metallic metastructure with a cavity enhanced detector principle. It will be shown that by applying a backside illuminated detector design compatibility to standard technology even with thin metal films is in general achievable.
17:00 - 17:30 - Nature-Inspired Photonic Surfaces for Next-Generation Imaging and Diagnostics Invited oral [Show abstract]
  • Lisa Poulikakos, UC San Diego, USA
Imaging science is a critical enabler of revolutionary scientific advances. However, current imaging technologies face prohibitive trade-offs in resolution, penetration depth and experimental complexity. Here, we introduce new classes of micro- and nanostructured photonic surfaces which scale down and enhance light-matter interactions, to overcome existing challenges in imaging science.
16:00 - Nonlinear and Multistable Metamaterials

Session chairperson(s): martin van hecke; Yi Chen

16:00 - 16:30 - Unifying The Design Space And Optimizing Linear And Nonlinear Truss Metamaterials By Generative Modeling Invited oral [Show abstract]
  • Li Zheng, ETH Zurich, Switzerland
  • Dennis Kochmann, ETH Zurich, Switzerland
  • Siddhant Kumar, TU Delft, Netherlands
The rise of machine learning has fueled the discovery of new materials and, especially, metamaterials—truss lattices being their most prominent class. While their tailorable properties have been explored extensively, the design of truss-based metamaterials has remained highly limited and often heuristic, due to the vast, discrete design space and the lack of a comprehensive parameterization. We here present a graph-based deep learning generative framework, which combines a variational autoencoder and a property predictor, to construct a reduced, continuous latent representation covering an enormous range of trusses. This unified latent space allows for the fast generation of new designs through simple operations (e.g., traversing the latent space or interpolating between structures). We further demonstrate an optimization framework for the inverse design of trusses with customized mechanical properties in both the linear and nonlinear regimes, including designs exhibiting exceptionally stiff, auxetic, pentamode-like, and tailored nonlinear behaviors. This generative model can predict manufacturable (and counter-intuitive) designs with extreme target properties beyond the training domain.
Media link(s):

Published paper: Zheng, L., Karapiperis, K., Kumar, S. et al. Unifying the design space and optimizing linear and nonlinear truss metamaterials by generative modeling. Nat Commun 14, 7563. https://doi.org/10.1038/s41467-023-42068-x

16:30 - 16:45 - Collision Of Transition Waves In Multistable Lattices Oral [Show abstract]
  • Anusree Ray, University of Galway, Ireland
  • Samanvay Anand, Indian Institute of Science Bangalore, India
  • Vivekanand Dabade, Indian Institute of Science Bangalore, India
  • Rajesh Chaunsali, Indian Institute of Science Bangalore, India
We introduce a magnetoelastic lattice generated by an assembly of fixed magnets to achieve monostable, bistable, and tristable configurations. Focusing on the tristable potential, we numerically and experimentally validate the existence of three distinct transition waves, each exhibiting unique amplitudes and velocities. By adjusting the potential symmetry via the localized external field, we further investigate wave collision dynamics. In lattices with asymmetric potentials, collisions between similar transition waves trigger the remote nucleation of a third phase. Conversely, in symmetric potentials, collisions between dissimilar transition waves create a stationary domain wall.
16:45 - 17:00 - Simulation and Identification of a Seismic Bistable Device with Hysteresis Oral [Show abstract]
  • Valeria Cavanni, Politecnico di Torino, Italy
  • Linda Scussolini, Politecnico di Torino, Italy
  • Oreste S. Bursi, Università di Trento, Italy
  • Corentin Coulais, Universiteit van Amsterdam, The Netherlands
  • Rosario Ceravolo, Politecnico di Torino, Italy
Mechanical metamaterials with bistable configurations offer a promising solution for enhancing energy dissipation in existing structures subjected to dynamic excitations. This research focuses on a pre-buckled steel bistable device engineered for energy dissipation, examining the critical interplay between geometric nonlinearity and hysteretic behaviour. The classical Bouc-Wen model is here modified to incorporate the effects of bistability. The study includes parametric simulations and instantaneous identification of the proposed model parameters. Finally, an equivalent damping factor that considers both viscous and hysteretic dissipation is calculated.
17:00 - 17:15 - Inertially Amplified Elastic Metametarial with Quasi-Zero Stiffness Oral [Show abstract]
  • Cetin Yilmaz, Bogazici University, Turkey
A lever-type inertially amplified elastic metamaterial with quasi-zero stiffness is investigated. By varying amplification ratio of the levers and pre-compressing the springs that generate negative stiffness, dispersion diagram of this structure is varied and low frequency band gaps are obtained.
17:15 - 17:30 - Analysing Wave Dynamics in Additively Manufactured Viscoelastic Metamaterials Oral [Show abstract]
  • Sidharth Beniwal, Engineering and Technology Institute Groningen (ENTEG), Faculty of Science and Engineering, University of Groningen , Netherlands
  • Ranjita Bose, Engineering and Technology Institute Groningen (ENTEG), Faculty of Science and Engineering, University of Groningen, Netherlands
  • Anastasiia Krushynska, Engineering and Technology Institute Groningen (ENTEG), Faculty of Science and Engineering, University of Groningen, Netherlands
Elastic metamaterials hold potential for advanced wave manipulation, yet their proper characterization remains underexplored due to challenges in predicting the frequency-dependent behavior of constituent polymer. This study presents a comprehensive framework to model the viscoelastic behavior of additively manufactured polymers, focusing on dynamic conditions rather than traditional static settings, using a quasi-1D acrylonitrile butadiene styrene (ABS) metamaterial as a representative system. The methodology combines material characterization through dynamic mechanical analysis (DMA) and tensile testing, and finite-element simulations incorporating frequency-dependent viscoelastic properties (from DMA) combined with ultrasonic transmission experiments. This mix provides a proper tool for precise prediction of wave dynamics in additively manufactured polymer metamaterials and hence a step faciliating functional applications like waveguiding, vibration isolation, energy harvesting, and others.
16:00 - Topological and Nonreciprocal Phenomena in Photonic Resonators

Session chairperson(s): P. André Gonçalves; Mohammad Sajjad Mirmoosa

16:00 - 16:30 - Geometrical phase resonators Invited oral [Show abstract]
  • Alexander Khanikaev, CREOL, College of Optics and Photonics, UCF, USA
Geometrical phases play a central role in numerous phenomena across physical fields and systems, from optical waveguides and metasurfaces to quantum systems and topological materials. Acquired during the adiabatic evolution of the multimodal system, it can add up to the conventional propagation phase and alter interference phenomena and resonance conditions of the system. Here we introduce a new type of resonator whose resonant condition is defined solely by the geometrical phase – a geometrical phase resonator. In such a resonator, based on photonic topological metasurfaces, topological boundary modes are designed to undergo an adiabatic evolution that gives rise to the net geometrical phase of 2????, rendering resonance without any propagation phase. This renders the resonance condition invariant with respect to its shape and length, which we confirmed both using first-principles simulations and in experiments. Specifically, we show that a set of samples with completely different geometries exhibit an extremely stable “geometrical resonance” pinned to a specific frequency. Therefore, we believe that geometrical resonators can be of profound importance for applications where such spectral stability of resonances is needed, including arrays of precisely tuned lasers, sensors, geometrical cavities coupled to quantum emitters.
16:30 - 17:00 - Topology-inspired Routes to Optical Field Confinement and Enhancement in Two-dimensional Photonic Crystals Invited oral [Show abstract]
  • René Barczyk, AMOLF, Netherlands
  • Daniël Muis, Delft University of Technology, Netherlands
  • Yandong Li, Cornell University, United States
  • Xiaozhou Wu, AMOLF, Netherlands
  • Sonakshi Arora, Delft University of Technology, Netherlands
  • Gennady Shvets, Cornell University, United States
  • Laurens Kuipers, Delft University of Technology, Netherlands
  • Ewold Verhagen, AMOLF, Netherlands
We explore the use of topological channels and symmetry breaking in two-dimensional silicon photonic crystals for the confinement and enhancement of light fields at the nanoscale. This includes highly degenerate Landau level flat bands in strained photonic crystals, and broadband light localization due to suppressed backscattering in terminated topological waveguides.
17:00 - 17:30 - Loss Threshold Phenomenon in Cavity-Enhanced Lorentz Nonreciprocity Invited oral [Show abstract]
  • Yakir Hadad, Tel-Aviv University, Israel
  • Koffi Emanuel Sadzi, Tel-Aviv University, Israel
<p> This work explores the interplay between loss and Lorentz nonreciprocity in gyrotropic systems embedded within electromagnetic cavities. We demonstrate that cavity-enhanced interactions can modify the loss threshold required to maintain nonreciprocity, leading to a robust and tunable nonreciprocal response. Using a rigorous analytical framework, we reveal the fundamental conditions under which a gyrotropic particle sustains nonreciprocity in the presence of dissipation. Our findings provide new insights into cavity-modified wave dynamics, with potential applications in nonreciprocal photonic devices, waveguides, and electromagnetic sensing. The results highlight the crucial role of system losses and cavity effects in controlling and optimizing nonreciprocal behavior.</p>
16:00 - Emerging Applications of Reconfigurable and Topological Metasurfaces

Session chairperson(s): Laura Na Liu; Steven Anlage

16:00 - 16:15 - A Study of Cylindrical Reconfigurable Intelligent Surfaces Oral [Show abstract]
  • Filippo Pepe, University of Sannio, Italy
  • Ivan Iudice, Italian Aerospace Research Centre (CIRA), Italy
  • Giuseppe Castaldi, University of Sannio, Italy
  • Marco Di Renzo, Universite Paris-Saclay, CNRS, CentraleSupelec, France
  • Vincenzo Galdi, University of Sannio, Italy
This study focuses on modeling and designing cylindrical reconfigurable intelligent surfaces for efficient beam steering, particularly in unmanned aerial vehicle networks. Starting from a rigorous electromagnetic model, an approximate formulation is developed along with an optimization framework suited for practical, low-complexity reconfigurable elements. Various optimization techniques are assessed to evaluate their effectiveness and suitability for these scenarios.
16:15 - 16:45 - Harnessing multiple scattering electromagnetic environments for wave control via in situ adjoint optimization Invited oral [Show abstract]
  • Tsampikos Kottos, Wesleyan University, USA
  • John Guillamon, Wesleyan University, USA
  • Cheng-Zhen Wang, Wesleyan University, USA
  • Zin Lin, Virginia Tech, USA
We develop an in-situ time- and energy-efficient adjoint optimization (AO) methodology for the manipulation of wave scattering in multiple scattering systems and demonstrate wave-driven functionalities like targeted channel emission, coherent perfect absorption and camouflage. Our paradigm leverages these highly multi-path complex environments which dramatically amplify small local system AO-informed variations.
16:45 - 17:00 - Manipulating the Electromagnetic Field in Wire Media Resonators for Enhanced Axion Detection Oral [Show abstract]
  • Jim Alexander Enriquez, ITMO university, Russia
  • Pavel A. Belov, ITMO university, Russia
<p> Microwave cavities aid in axion detection, where key parameters include quality factor, volume, and field homogeneity. We present a simple method to control field homogeneity in wire medium-filled cavities using an air gap. When its thickness is a quarter of the plasma wavelength, the field becomes uniform, enhancing axion detection.</p>
17:00 - 17:30 - Topological Metasurface for Intelligent Applications Invited oral [Show abstract]
  • Jian Wei You, Southeast University, China
  • Tie Jun Cui, Southeast University, China
Recent advancements in topological metasurfaces have unveiled unprecedented opportunities for intelligent electromagnetic systems. Here, we present our breakthroughs in reprogrammable plasmonic topological insulators, flexible valley-Hall systems, phase-transition photonic bricks, and multifunctional topological metasurface to establish a unified framework for intelligent applications such as intelligent gesture recognition. Specifically, the integration of topological metasurfaces with machine-learning-driven design and control highlights their promising applications in smart healthcare, smart homes, next-generation wireless communication, and electromagnetic intelligence agents. These contributions position topological metasurfaces as a fundamental cornerstone for the emerging era of cognitive electromagnetic intelligence.
17:30 - 18:30 - Break before Social Dinner
18:30 - 21:00 - Social Dinner
4 September 2025 / Start time: 9 h 0 min
09:00 - 10:00 - Oral Sessions (Thursday Morning 1)
09:00 - Metamaterials & Machine Learning

Session chairperson(s): Georgia Theano Papadakis; Harry Atwater

09:00 - 09:30 - Recent Results of Metamaterial Agent (MetaAgent) Invited oral [Show abstract]
  • Lianlin Li, State Key Laboratory of Photonic and Communications, School of Electronics, Peking University, Beijing 100871, China, China
Metamaterials have revolutionized wave control; in the last two decades, they evolved from passive devices via programmable devices to sensor-endowed self-adaptive devices realizing a user-specified functionality. Although deep-learning techniques play an increasingly important role in metamaterial inverse design, measurement post-processing and end-to-end optimization, their role is ultimately still limited to approximating specific mathematical relations; the metamaterial is still limited to serving as proxy of a human operator, realizing a predefined functionality. Here, we propose and experimentally prototype a paradigm shift toward a metamaterial agent (coined metaAgent) endowed with reasoning and cognitive capabilities enabling the autonomous planning and successful execution of diverse long-horizon tasks, including electromagnetic (EM) field manipulations and interactions with robots and humans. Leveraging recently released foundation models, metaAgent reasons in high-level natural language, acting upon diverse prompts from an evolving complex environment. Specifically, metaAgent’s cerebrum performs high-level task planning in natural language via a multi-agent discussion mechanism, where agents are domain experts in sensing, planning, grounding, and coding. In response to live environmental feedback within a real-world setting emulating an ambient-assisted living context (including human requests in natural language), our metaAgent prototype self-organizes a hierarchy of EM manipulation tasks in conjunction with commanding a robot. metaAgent masters foundational EM manipulation skills related to wireless communications and sensing, and it memorizes and learns from past experience based on human feedback.
09:30 - 09:45 - Generative Inverse Design of Metamaterials Enhanced by Physics-Informed Neural Network Oral [Show abstract]
  • Vlad Medvedev, Fraunhofer IISB, Germany
  • Andreas Rosskopf, Fraunhofer IISB, Germany
  • Andreas Erdmann, Fraunhofer IISB, Germany
We introduce a data-free deep learning framework that combines a Conditional Deep Convolutional Generative Adversarial Network (cDCGAN) with a Physics-Informed Neural Network (PINN) for inverse metamaterial design. The cDCGAN generates flexible meta-atom shapes, while the PINN acts as a fast, physics-based simulator, enforcing Maxwell's equations and rapidly generating training data.
Media link(s):

A video preview can be downloaded from: https://owncloud.fraunhofer.de/index.php/s/mQsXjgk2UVjQrQs

09:45 - 10:00 - Self-Learning Active Metamaterials: A Local Learning Framework For Non-reciprocal Linear Flow Networks Oral [Show abstract]
  • Raúl Candás, AMOLF, Netherlands
  • Menachem Stern, AMOLF, Netherlands
We present a framework for physical local learning in metamaterials based on a linear flow network with symmetric and antisymmetric components. This model extends previous work on steady-state networks, incorporating asymmetric interactions to broaden the scope and potential applications of local learning procedures.
09:00 - Wave Control in Mechanical Metamaterials

Session chairperson(s): Ying Wu; Lucia Stein-Montalvo

09:00 - 09:30 - A Computational Homogenization Methodology for the Analysis and Design of Subwavelength Mechanical and Acoustic Metamaterials on Finite Size Domains Invited oral [Show abstract]
  • Varvara Kouznetsova, Eindhoven University of Technology, Netherlands
  • Renan Liupekevicius, Eindhoven University of Technology, Netherlands
  • Xhorxha Kuci, Eindhoven University of Technology, Netherlands
  • Johannes van Dommelen, Eindhoven University of Technology, Netherlands
  • Marc Geers, Eindhoven University of Technology, Netherlands
This talk will present the recent advancements in the computational homogenization techniques for modelling elastic and acoustic wave propagation in locally resonant metamaterials on finite size domain in both frequency and time domains, including transient regimes.
09:30 - 09:45 - Acousto-electromagnetic media: Homogenization and constraints Oral [Show abstract]
  • Michael Haberman, The University of Texas at Austin, USA
Ensembles of asymmetric piezoelectric scatterers embedded in a background medium have been predicted to couple acceleration to electric displacement. Previous models of this so-called electromomentum coupling are based on electrostatics. However, energy conservation involving time-varying electric fields requires considering the magnetic field. This work employs an acousto-electromagnetic polarizability matrix to calculate the fields scattered by a one-dimensional lattice of asymmetric piezoelectric scatterers. The effective constitutive relations couple acoustics and electromagnetism and satisfy passivity and reciprocity.
09:45 - 10:00 - Ultrabroadband Achromatic Elastic Metasurface Via Synthesized Dispersion Engineering Oral [Show abstract]
  • Geon Lee, Pohang University of Science and Technology, Korea (South)
  • Junsuk Rho, Pohang University of Science and Technology, Korea (South)
<p> We introduce a synthesized dispersion-engineering approach that compensates for both diffraction and refraction effects, enabling ultra-broadband achromatic focusing from audible to ultrasonic frequencies. Using Kirchhoff–Love plate theory, we achieve a quasi-continuous phase profile, eliminating the need for complex meta-atom designs. Furthermore, we integrate piezoelectric energy harvesting, demonstrating significantly amplified electrical output.</p>
09:00 - Nonlinear and Tunable Optical Effects in Organic and Inorganic Nanophotonics

Session chairperson(s): Dorota A. Pawlak; Giulia Tagliabue

09:00 - 09:30 - Tailoring Optical Properties in Organic Polymers: from Ion-Injected GRIN Materials to Nonlinear Optical Tuning Invited oral [Show abstract]
  • P. Franceschini, University of Brescia, Iatly
  • W. Jaffray, SUPA Edinburgh, United Kingdom
  • A. Tognazzi, Università degli studi di Palermo, Iatly
  • S. Stengel, SUPA Edinburgh, United Kingdom
  • V. M. Demartis, University of Brescia, Italy
  • D. de Ceglia, University of Brescia, Italy
  • L. Carletti, University of Brescia, Italy
  • E. Menshikov, University of Brescia, Italy
  • L. Alessandri, University of Brescia, Italy
  • A. C. Cino, SUPA Edinburgh, United Kingdom
  • M. Scalora, Charles M. Bowden Research Center, USA
  • C. De Angelis, University of Brescia, Italy
  • F. Torricelli, University of Brescia, Italy
  • M. Ferrera, SUPA Edinburgh, United Kingdom
  • Maria Antonietta Vincenti, University of Brescia, Italy
<p> Tunable optical devices enable dynamic control of optical properties, essential for advanced photonic applications. PEDOT:PSS, a flexible organic conductor, offers significant potential for achieving spatially tunable optics and ultrafast nonlinear modulation. These results pave the way for next-generation adaptive photonic technologies in communications, imaging, and ultrafast photonics.</p>
09:30 - 09:45 - Rashba Polariton Lasing from Perovskite Metasurfaces Oral [Show abstract]
  • Andrea Zacheo, Nanyang Technological University, Singapore
  • Yutao Wang, Nanyang Technological University, Singapore
  • Dario Gerace, Università di Pavia, Italy
  • Giorgio Adamo, Nanyang Technological University, Singapore
  • Cesare Soci, Nanyang Technological University, Singapore
We demonstrate the first spin-polarized exciton-polariton condensate in a monolithic perovskite metasurface that supports bound states in the continuum (BIC). The resulting coherent emission displays spin-split, momentum-entangled dispersion, highlighting the potential of these active metasurfaces to tailor the dispersion/polarization of polaritonic devices.
09:45 - 10:00 - Nonlinear Nanophotonics with Mie-Resonant Nanostructures Based on Wafer-Bonded Crystalline AlInP – a Low-Loss χ(2) Material Oral [Show abstract]
  • Radoslaw Kolkowski, Department of Applied Physics, Aalto University, Finland
  • Seyed Ahmad Shahahmadi, Engineered Nanosystems Group, Aalto University, Finland
  • Serguei Novikov, Engineered Nanosystems Group, Aalto University, Finland
  • Jani Oksanen, Engineered Nanosystems Group, Aalto University, Finland
  • Andreas C. Liapis, Department of Electronics and Nanoengineering, Aalto University, Finland
  • Huayu Bai, Department of Applied Physics, Aalto University, Finland
  • Timo Stolt, Department of Applied Physics, Aalto University, Finland
  • Matti Kaivola, Department of Applied Physics, Aalto University, Finland
  • Andriy Shevchenko, Department of Applied Physics, Aalto University, Finland
We use wafer-bonded crystalline aluminum indium phosphide (AlInP) to fabricate Mie-resonant nanostructures with strongly enhanced second-order nonlinear optical response. In particular, we experimentally demonstrate the resonant enhancement of second harmonic generation in AlInP nanodisks operating close to the anapole condition. Our results showcase AlInP as an attractive material for nonlinear nanophotonic applications.
09:00 - Metasurfaces for Antenna Systems III

Session chairperson(s): Hiroki Wakatsuchi; Enrica Martini

09:00 - 09:15 - Reconfigurable Transmissive Huygens Metasurfaces for Antenna Wavefront Manipulation via Locally Optimized Design Oral [Show abstract]
  • Stefano Vellucci, Niccolò Cusano University, Italy
  • Alessio Monti, Roma Tre University, Italy
  • Mirko Barbuto, Roma Tre University, Italy
  • Alessandro Toscano, Roma Tre University, Italy
  • Filiberto Bilotti, Roma Tre University, Italy
This work presents a two-state reconfigurable Huygens metasurface that dynamically switches between beam-steering and transparent operation. Reconfigurability is achieved by modulating only the outermost layer of a cascaded unit-cell architecture, leveraging a multi-objective local optimization of surface impedances to minimize active components while ensuring full 2π phase coverage. The HMS is evaluated as a planar meta-dome integrated with PIN diodes in an antenna array, demonstrating its potential for dynamic wavefront control.
09:15 - 09:30 - Chameleon Metasurfaces for Complex Target Mimicking Oral [Show abstract]
  • Mikhail Tsukerman, ITMO University, Russia
  • Konstantin Grotov, Tel Aviv University, Israel
  • Ildar Yusupov, ITMO University, Russia
  • Pavel Ginzburg, Tel Aviv University, Israel
In the following research, we propose a new passive method for RCS mimicking using metasurface consisting of spherical scatterers. By leveraging stochastic optimization method and T-matrix scattering calculations, we designed an adaptable electromagnetic system. This approach enables practical and effective electromagnetic mimicking for spectrums of objects with different geometrical complexity.
09:30 - 10:00 - Nonreciprocal Magnetless Phased-Array Antenna with Decoupled Beam Scanning Invited oral [Show abstract]
  • Alexander Mackay, University of Toronto, Canada
  • George Eleftheriades, University of Toronto, Canada
Time-modulated materials have emerged as a means to realize microwave nonreciprocity and are therefore an enabling technology for future antenna applications. Here, we show how such materials, when implemented as nonreciprocal phase shifters, can realize an element-level in-band full-duplex phased-array antenna with decoupled beam scanning. Specifically, each element of the array can support simultaneous transmit and receive beam signals; therefore transmit and receive beams can scan to independent directions, with independent transmit and receive feed ports. Transmit and receive signal isolation depends on the implementation of a microwave coupler but requires no active cancellation. The phased-array feed itself is modular with respect to the antenna elements.
09:00 - Novel Sensing and Display Approches in Metamaterials

Session chairperson(s): Yang Zhao; Abdoulaye Ndao

09:00 - 09:30 - Sustainable Manufacturing of Optical Metasurfaces for Imaging, Sensing and Display Invited oral [Show abstract]
  • Junsuk Rho, POSTECH, Korea (South)
This talk will discuss the latest progress in metasurface technology, emphasizing its applications, functional advancements, and recent breakthroughs in scalable fabrication techniques.
09:30 - 09:45 - Roll-to-plate Printable RGB Achromatic Metalens For Wide-field-of-view Holographic Near-eye Display Oral [Show abstract]
  • Minseok Chou, Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea, Korea (South)
  • Joohoon Kim, Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea, Korea (South)
  • Junsuk Rho, Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea, Korea (South)
We introduce a centimeter-scale RGB achromatic metalens fabricated using a roll-to-plate technique and explore its potential for practical applications in NEDs. Furthermore, the integration of scalable large-area RGB achromatic metalens with CGH advances practical applications in NEDs.
09:45 - 10:00 - A Proprioceptive Metamaterial Oral [Show abstract]
  • Christopher Stevens, University of Oxford, United Kingdom
  • Huirrui Dai, University of Oxford, United Kingdom
  • Georgiana Dima, University of Oxford, United Kingdom
<p> Soft robot systems have a [particular problem in terms of proprioception and the detection of pose. We have developed a metamaterial-based sensor that can continuously determine the pose of a robot limb or digit. This paper describes the sensor's physics, engineering and its performance.</p>
10:00 - 10:30 - Coffee Break (Thursday Morning)
10:30 - 12:30 - Oral Sessions (Thursday Morning 2)
10:30 - Special session: Metamaterials and Sustainable Energy 1

Organizer(s): Albert Polman; Esther Alarcon-Llado

Session chairperson(s): Albert Polman; Esther Alarcon-Llado

10:30 - 11:00 - Power Spectral Density Control With Metasurfaces Enabling New Solar Cell Designs Invited oral [Show abstract]
  • Esther Alarcon-Llado, AMOLF, Netherlands
For the large-scale deployment of solar energy conversion technologies, whether to electrical or chemical energy, we must master broadband control of light-scattering. Designing the spatial frequencies in metasurfaces allows for distributing light in directions at will. Solar energy conversion devices greatly benefit from the light scattering control of metasurfaces, from extreme absorption to colorful aesthetics.
11:00 - 11:30 - Active near-IR and mid-IR materials for temperature regulation in building Invited oral [Show abstract]
  • Georgia Theano Papadakis, ICFO, Spain
Tailoring of thermal radiation is critical for applications like daytime radiative cooling, thermophotovoltaic energy conversion, solar hearing, spectroscopy and sensing. In this talk, I will discuss design rules and available materials for near-unity change in the thermal emissivity of planar structures. Based on these design rules, I will present experimental results of switchable diffuse thermal emission with In3SbTe2. I will also discuss how In3SbTe2 and other relevant near-infrared and mid-infrared materials can play a crucial role in developing robust temperature regulation platforms for macroscopic temperature regulation in buildings. I will present predictions and initial results on actively tunable smart windows that modulate both the near- and mid-infrared influx and outflux of radiation, thereby controlling cooling and heating functionalities and yielding a prediction of up to 30% energy savings in buildings in urban environments.
11:30 - 12:00 - Tailoring Incoherent Coherent Radiation with Guided-Mode Metastructures for Energy Applications Invited oral [Show abstract]
  • Harry Atwater, California Institute of Technology, USA
  • Komron Shayega, California Institute of Technology, USA
  • Yae-Chan Lim, California Institute of Technology, USA
  • Arun Nagpal, California Institute of Technology, USA
  • Nimisha Ramprasad, California Institute of Technology, USA
  • Lior Michael, California Institute of Technology, USA
<p> Thermal emission is usually thought to be incoherent and reciprocal, with balanced absorption and emission for a given wavelength and angular channel. However, metastructures that support surface waves allow for design of the relationship between in-plane wave vector and radiation wavelength, enabling self-focused thermal emission via a collective resonance.&amp;amp;nbsp; We report simulations and experiments that demonstrate focusing of both thermal radiation and luminescence radiation, where, in-plane spatial coherence combined with local resonances can be used to realize emission with controlled spatial phase profile.</p>
12:00 - 12:30 - Unraveling Hot Carrier Processes for Advancing Plasmonic Energy Devices Invited oral [Show abstract]
  • Giulia Tagliabue, LNET - IGM - STI - EPFL, Switzerland
Hot carriers and photoluminescence in metals have opened new pathways for controlling photo(electro)chemical processes and monitoring temperatures. In this talk I will present reuslt unravelling fundamental aspects of these processes.
10:30 - Special session: Metamaterials and Fluids

Organizer(s): Anastasiia Krushynska

Session chairperson(s): Anastasiia Krushynska; José Bico

10:30 - 11:00 - Near-Wall Pressure Power Spectral Density Content in High-Speed Internal Flows Invited oral [Show abstract]
  • Quentin Hopman, University of Groningen, Netherlands
  • Kamiel Politiek, University of Groningen, Netherlands
  • Bastiaan Piest, University of Groningen, Netherlands
  • Anastasiia Krushynska, University of Groningen, Netherlands
Geometric-dependent turbulence in pipes causes fluid-induced vibrations. This study explores the groundwork for turbulence mitigation through externally mounted phononic structures by characterizing the flow. Large Eddy Simulations (LES) of sudden expansions and 90-degree bends reveal dominant turbulence frequencies around 100 Hz. These findings inform the first step in the design of phononic structures to disrupt turbulence-induced vibrations. Future work includes fluid-structure interaction (FSI) simulations and experimental validation.
11:00 - 11:30 - Kirigami for Urban Ventilation Invited oral [Show abstract]
  • Lucia Stein-Montalvo, Northwestern University, USA
  • Chealen Berry, Northwestern University, USA
  • Liuyang Ding, Princeton University, USA
  • Marcus Hultmark, Princeton University, USA
  • Sigrid Adriaenssens, Princeton University, USA
  • Elie Bou-Zeid, Princeton University, USA
With simulations and wind tunnel experiments, we explore how kirigami-based mechanical metamaterials can improve ventilation in urban spaces with stagnant air. We study how geometry affects air exchange and local flow features in the presence of oncoming wind, and implement an interactive meter-scale demonstrator, showcasing kirigami's potential for adaptive architecture.
11:30 - 12:00 - Inflating To Shape: From Planar Sheets To 3D Structures Invited oral [Show abstract]
  • José Bico, PMMH-ESPCI, Paris Sciences et Lettres, Sorbonne U, Paris Sciences et Lettres U., CNRS, France
  • Tian Gao, LadHyx, École Polytehcnique, CNRS, France
  • Emmanuel Siéfert, LiPHY, Université Grenoble Alpes, CNRS, France
  • Nathan Vani, PMMH-ESPCI, Paris Sciences et Lettres, Sorbonne U, Paris Sciences et Lettres U., CNRS, France
  • Joo-Won Hong, ESPCI, Paris Sciences et Lettres, Sorbonne U, Paris Sciences et Lettres U., CNRS, France
  • Maïka Saint-Jean, ESPCI, Paris Sciences et Lettres, Sorbonne U, Paris Sciences et Lettres U., CNRS, France
  • Satyanu Bhadra, ESPCI, Paris Sciences et Lettres, Sorbonne U, Paris Sciences et Lettres U., CNRS, France
  • Alejandro Ibarra, Luxembourg University, Luxembourg
  • Étienne Reyssat, ESPCI, Paris Sciences et Lettres, Sorbonne U, Paris Sciences et Lettres U., CNRS, France
  • Benoît Roman, ESPCI, Paris Sciences et Lettres, Sorbonne U, Paris Sciences et Lettres U., CNRS, France
Inflating channels embedded in a patch of elastomer or a piece of air-tight fabric induces in-plane distortions leading to 3D shapes. How can we program the deployed shape? Is controlling in-plane distortion enough to dictate the actual shape of the inflated structure?
12:00 - 12:30 - Panel Discussion Round Table Discussion [Show abstract]
  • Anastasiia Krushynska, University of Groningen, The Netherlands
  • Lucia Stein-Montalvo, Princeton University, USA
  • José Bico, ESPCI, France
Panel discussion chaired by Anastasiia Krushynska
10:30 - Temporal Metamaterials I

Session chairperson(s): Dimitrios Sounas

10:30 - 11:00 - Engineering Wave Propagation with Temporal Metamaterials Invited oral [Show abstract]
  • Vincenzo Galdi, University of Sannio, Italy
This presentation explores recent advancements in temporal metamaterials, which feature time-dependent properties for dynamic wave manipulation. Topics include temporal multisteps, short-pulsed metamaterials, and aperiodic time modulation, highlighting novel wave phenomena and applications. We also discuss inverse design methods tailored for these emerging materials.
11:00 - 11:30 - Modeling and Analysis of the Wave Dynamics by Temporal Switching in Optical Guiding Structures Invited oral [Show abstract]
  • Amir Shlivinski, Ben Gurion University of the Negev, School of Electrical and Computer Engineering, Israel
  • Yakir Hadad, Tel-Aviv University, Schools of Electrical Engineering, Israel
Wave dynamics in time-varying, lossy, dispersive waveguides offer intriguing physical phenomena and applications. Using a Laplace-transform-based model, we analyze a hollow lossy, dispersive dielectric fiber, revealing mode coupling, focusing, and radiation effects upon temporal switching with a precise control over their characteristics.
11:30 - 11:45 - Adiabatic temporal media and their potential to mimic time refraction Oral [Show abstract]
  • Victor Pacheco-Peña, Newcastle University, United Kingdom
  • Mariya Antyufeyeva, Newcastle University and V. N. Karazin Kharkiv National University, United Kingdom
We study adiabatic modulations of the refractive index of the material where a wave propagates and demonstrate both theoretically and numerically that it is possible to mimic time refraction when carefully engineering the rising/falling time of a smoothly varying refractive index. In this way, it will be shown how the rapid temporal modulation required for time interfaces can be relaxed.
11:45 - 12:00 - Noether’s Theorem in Spatiotemporal Metamaterials Oral [Show abstract]
  • Iñigo Liberal, Universidad Publica de Navarra, Spain
Noether’s theorem is one of the most influential theorems in physics. However, its usage in nanophotonics is rather limited. In our talk, we will discussed how composite symmetries enable the applicability of Noether’s theorem in a wide range of configurations. We will pay special attention to spatiotemporal translation symmetries and spatiotemporal rotations due to the recent interest in time-varying media.
12:00 - 12:15 - Amplifying Optical Pulses with Space-Time Wedges Oral [Show abstract]
  • Klaas De Kinder, KU Leuven, Belgium
  • Christophe Caloz, KU Leuven, Belgium
We propose Doppler pulse amplification (DPA), an alternative to chirped pulse amplification (CPA) that uses moving space-time impenetrable interfaces instead of dispersive elements to amplify optical pulses. DPA stretches and compresses optical pulses via Doppler frequency shifts in space-time wedges, avoiding higher-order dispersion and potentially mitigating gain narrowing. This approach enables compact, high-intensity pulse amplification, with the same applications as CPA.
12:15 - 12:30 - Dynamic of Phase Dislocation in a Controlled Array of Parametric Oscillators Oral [Show abstract]
  • Benjamin Apffel, Laboratory of Wave Engineering, STI, EPFL, Switzerland
We investigate topological features in a chain of parametric oscillators where we leverage the external forcing of each oscillator independently. We show the existence of traveling phase dislocations due to half-phase winding and investigate the impact of non-linearities. An experimental realization using Daraday instability in a vibrated fluid is proposed
10:30 - Analysis and Synthesis of Microwave Metastructures

Session chairperson(s): Stefano Vellucci; Jordan Budhu

10:30 - 10:45 - Anisotropy in a Wire Medium due to the Rectangularity of a Unit Cell Oral [Show abstract]
  • Denis Sakhno, ITMO University, Russia
  • Pavel Belov, ITMO University, Russia
This study explores the dispersion characteristics of a wire medium composed of a rectangular lattice of parallel wires near its plasma frequency. Although effective medium theory suggests isotropic behavior for transverse magnetic waves, numerical simulations indicate significant anisotropy. This finding is supported by the line-of-current approximation theory. The anisotropic effect emerges when the plasma wavelength is comparable to the lattice period and disappears for extremely thin wires. The degree of anisotropy was revealed at the level of 6% along the wires and more than 75% across them.
10:45 - 11:00 - Perpendicular Incidence on Complementary Split-Ring Resonator Composite Media Oral [Show abstract]
  • Vasileios Salonikios, Aristotle University of Thessaloniki, Greece
  • Michalis Nitas, Independent Researcher, Denmark
We investigate the behavior of the recently proposed simplified complementary split- ring resonator composite medium under perpendicular wave incidence. Utilizing the solutions of wave excitation problems, we compare the behavior of the novel medium with the one consisting of ordinary complementary resonators. Simulated results exhibit a very similar behavior, with respect to the passband frequency zones and the preservation of the supported modes.
11:00 - 11:15 - Impedance Based Synthesis of Circular Modulated Metasurface Antennas with Entire Domain Basis Functions Oral [Show abstract]
  • John Le, University of Michigan - Ann Arbor, USA
  • Jorge Ruiz-García, Université de Rennes, INSA Rennes, CNRS, IETR, France
  • Anthony Grbic, University of Michigan - Ann Arbor, USA
This paper presents a numerical technique for the synthesis of circular modu lated metasurface antennas through impedance optimization of a metasurface using a Method of Moments (MoM) formulation. The metasurface is modeled as an inhomogeneous, transparent sheet impedance boundary condition (IBC) layer atop a grounded dielectric substrate. Both the current density over the aperture and the sheet impedance are expanded into orthogonal sets of entire-domain Fourier-Bessel basis functions (FBBFs). The optimization procedure tunes the expansion coefficients of the sheet impedance to achieve a desired far-field radiation pattern while ensuring a purely reactive IBC. An isotropic, azimuthally invariant metasurface antenna is designed that radiates a radial Gaussian beam to verify the proposed approach.
11:15 - 11:30 - Synthesis of Cylindrical Metasurfaces through Tailoring the Propagation Characteristics of Electromagnetic Waves Oral [Show abstract]
  • Davorin Mikulic, University of Zagreb, Croatia
  • Marko Bosiljevac, University of Zagreb, Croatia
  • Zvonimir Šipuš, University of Zagreb, Croatia
This paper presents a fast and efficient approach for designing metasurfaces that conform to curved geometries. We introduce analytical tools that allow for the efficient extraction of parameters related to electromagnetic wave propagation along cylindrical metasurfaces, enabling the design of diverse components with minimal curvature-induced effects.
11:30 - 12:00 - Rigorous Solution for the Canonical Problem of Anomalous Reflection from a Modulated Impedance Boundary Invited oral [Show abstract]
  • Federico Giusti, University of Siena, Italy
  • Enrica Martini, University of Siena, Italy
  • Stefano Maci, University of Siena, Italia
  • Matteo Albani, University of Siena, Italia
We rigorously study the canonical problem of an anomalous reflector constituted by an infinite periodic reactance surface designed based on the generalized reflection law. For this canonical problem, the amplitude of the scattered field is derived in closed form for all the diffraction orders. The derived results are numerically validated.
12:00 - 12:15 - Multifunctional Metasurfaces at Millimeter-Waves and Terahertz for Next-Generation Wireless Systems Oral [Show abstract]
  • Damián Rodríguez-Trujillo, Public University of Navarra, Spain
  • Alicia E. Torres-García, Public University of Navarra, Spain
  • Mikel Aldea, Public University of Navarra, Spain
  • Jorge Teniente, Public University of Navarra, Spain
  • Asier Marzo-Pérez, Public University of Navarra, Spain
  • Miguel Beruete, Public University of Navarra, Spain
Multifunctional metasurfaces offer promising solutions for high-frequency wireless systems. This work proposes a metasurface optimized via neural networks, capable of delivering distinct electromagnetic responses under varying illumination. By combining the Huygens-Fresnel principle with AI optimization, the design achieves high efficiency, adaptability, and scalability.
12:15 - 12:30 - Simulation of Time- and Shape-Varying 3D Metamaterials Using the Finite Element Method Oral [Show abstract]
  • Ruth Medeiros, Universidad Politecnica de Madrid, Spain
  • Monica Ortega, Universidad Politecnica de Madrid, Spain
  • Clara Iglesias-Tesouro, Universidad Politecnica de Madrid, Spain
  • Valentin de la Rubia, Universidad Politecnica de Madrid, Spain
Over the last few years, there has been growing interest in using time- and shape-varying systems to explore new electromagnetic phenomena and develop innovative applications for communications systems. Accurate simulation of 3D electromagnetic structures with time-varying geometries or time-modulated material properties is a critical point to address proper design of next generation metamaterial-based devices, even though these dynamical systems present unique challenges. This work introduces a full-wave 3D electromagnetic solver based on the finite element method (FEM), to analyze the electromagnetic response of time- and shape varying 3D metamaterials.
10:30 - npj Metamaterials and npj Nanophotonics Special Session on Fabrication and Characterization

Session chairperson(s): Humeyra Caglayan

10:30 - 11:00 - Enabling Optical And Functional Composites Invited oral [Show abstract]
  • Dorota A. Pawlak, Ensemble3 Centre of Excellence, Poland
  • Kingshuk Bandopadhay, Ensemble3 Centre of Excellence, Poland
  • Nada Aghad, Ensemble3 Centre of Excellence, Poland
  • Ali Abbas, Ensemble3 Centre of Excellence, Poland
  • Piotr Piotrowski, Ensemble3 Centre of Excellence, Poland
  • Monika Tomczyk, Ensemble3 Centre of Excellence, Poland
  • Katarzyna Sadecka, Ensemble3 Centre of Excellence, Poland
  • Krzysztof Markus, Ensemble3 Centre of Excellence, Poland
  • Andrzej Materna, Ensemble3 Centre of Excellence, Poland
  • Hamid Reza-Darabian , Ensemble3 Centre of Excellence, Poland
Put your abstract hereWe report on developments in the composite materials based on crystalline and glass phases, and including various dopants including quantum dots and plasmonic particles. We report on their properties and potential applications in the optoelectronics, photonics and energy applications.
11:00 - 11:30 - Multiphoton Lithography for Metamaterials Fabrication Invited oral [Show abstract]
  • Maria Farsari, FORTH, Greece
Multiphoton Lithography (MPL) uses laser-based nonlinear optical absorption for high-resolution additive manufacturing, achieving feature sizes in nanometers. It enables precise 3D fabrication within photosensitive materials, advancing fields like photonics, biomedical engineering, and metamaterials for novel applications in optics and mechanics.
11:30 - 11:45 - Discovery of Phonon-Polaritonic Skyrmions: Transition from Néel to Bubble Type Oral [Show abstract]
  • Harald Giessen, University of Stuttgart, Germany
We introduce the concept of phonon-polaritonic skyrmions in thin SiC films, which are known for their extreme k-tuning over a narrow excitation wavelength range due to its strong dispersion within the Reststrahlen band. We utilize the strong sublinear dispersion of SiC to measure and characterize the transition from bubble- to Néel-type skyrmions through minute changes in excitation wavelength.
11:45 - 12:00 - Optical Metrology of 3D Nanoscale Objects Challenges Precision of Scanning Electron Microscopy Oral [Show abstract]
  • Jinkyu So, Nanyang Technological University, Singapore
  • Eng Aik Chan, Nanyang Technological University, Singapore
  • Giorgio Adamo, Nanyang Technological University, Singapore
  • Nikolay I. Zheludev, University of Southampton, United Kingdom
We present the first experimental demonstration of all-optical label free metrology of 3D nanoscale objects with precision of λ/467 and λ/96 for the in-plane and out-of-plane object dimensions. The deeply subwavelength precision is facilitated by gathering the a posteriori information on the diffraction patterns from similar objects. The metrology challenges precision of scanning electron microscopy and is suitable for characterization of plasmonic and metamaterial samples.
12:00 - 12:15 - All-Dielectric Metasurface Supporting Quasi-Bound States in the Continuum for Ultraviolet Light Oral [Show abstract]
  • Beáta Idesová, Brno University of Technology, Central European Institute of Technology, Czech Republic
  • Filip Ligmajer, Brno University of Technology, Central European Institute of Technology; Brno University of Technology, Faculty of Mechanical Engineering, Institute of Physical Engineering , Czech Republic
  • Alexander Berestennikov, Ludwig Maximilians University Munich, Faculty of Physics, Nanoinstitute Munich, Chair in Hybrid Nanosystems, Germany
  • Leonardo de Souza Menezes, Ludwig Maximilians University Munich, Faculty of Physics, Nanoinstitute Munich, Chair in Hybrid Nanosystems; Departamento de Física, Universidade Federal de Pernambuco, Germany; Brazil
  • Andreas Tittl, Ludwig Maximilians University Munich, Faculty of Physics, Nanoinstitute Munich, Chair in Hybrid Nanosystems, Germany
  • Tomáš Šikola, Brno University of Technology, Central European Institute of Technology; Brno University of Technology, Faculty of Mechanical Engineering, Institute of Physical Engineering, Czech Republic
Label-free optical sensing provides a non-invasive approach to detecting biomolecular interactions. Nanophotonics offers a novel approach in the form of metasurfaces that support quasi-bound states in the continuum (qBICs). In our work, we propose a metasurface supporting qBICs in the UV region, that could be used for next-generation biosensing technologies.
12:15 - 12:30 - Experimental Realization of the Optical Tellegen Effect in Nonreciprocal Metasurfaces Oral [Show abstract]
  • Shadi Safaei Jazi, Aalto University, Finland
  • Ihar Faniayeu, University of Gothenburg, Sweden
  • Rafael Cichelero, University of Gothenburg, Sweden
  • Nikolai Kuznetsov, Aalto University, Finland
  • Sebastiaan van Dijken, Aalto University, Finland
  • Shanhui Fan, Stanford University, USA
  • Alexandre Dmitriev, University of Gothenburg, Sweden
  • Viktar Asadchy, Aalto University, Finland
We present the first experimental demonstration of an optical Tellegen metasurface, composed of cobalt-silicon nanocones with shape anisotropy. Leveraging spontaneous magnetization, it exhibits a strong Tellegen response, enabling nonreciprocal light reflection.
12:30 - 14:00 - Lunch break and Poster Session IV (Thursday)
12:30 - Poster session IV

Session chairperson(s): Debapriya Pal

1 - Design Of A Soft Porous Metamaterial For Passive Daytime Radiative Cooling Poster [Show abstract]
  • Nigar Namazzade, Université de Bordeaux, France
  • Alexandre Baron, Université de Bordeaux, France
Passive daytime radiative cooling occurs when a body cools through thermal radiation without electricity, by backscattering solar radiation and emitting in the atmospheric transparency window. We characterize this using FEM simulations and effective medium parameter retrieval, comparing results with the extended Maxwell-Garnett theory.
2 - Optimization of imaging systems containing metasurfaces using a ray-wave model Poster [Show abstract]
  • Enzo Isnard, Thales Research & Technology, France
  • Sébastien Héron, Thales Research & Technology, France
  • Mahmoud Elsawy, Centre Inria d'Université Côte d'Azur, France
  • Stéphane Lanteri, Centre Inria d'Université Côte d'Azur, France
We describe a methodology for optimizing imaging performances of optical imaging systems containing both refractive optical elements and metasurfaces. The modelling of systems is done with a combination of geometrical and Fourier optics to take into account diffraction effects in the computation of the imaging performances. A surrogate model based on the local periodicity approximation is used to calculate the optical response of meta-atoms. System optimization is performed using an evolutionary strategy that takes into account both the distribution of meta-atoms on the metasurface and the geometry of refractive lenses.
3 - Fast Forward Prediction of Metasurface Transmission Spectra Using Deep Learning Poster [Show abstract]
  • Md Imran Hossain, Faculty of Engineering and Natural Science, Tampere University, Finland
  • Linzhi Yu, Faculty of Engineering and Natural Science, Tampere University, Finland
  • Humeyra Caglayan, Institute for Photonic Integration, Eindhoven University of Technology, Netherlands
A neural network miming a conventional numerical simulator like Ansys Lumerical FDTD is presented in this work. The neural network capable of predicting the transmission spectra of gold metasurfaces within the 1200 to 1700 nm region within a couple of milliseconds with 85.27% accuracy. The model is trained with 10,000 simulated data of metasurfaces with varied geometries. The model aims to present a time-efficient method for investigating polarization conversion and vector holography through gradient metasurfaces.
4 - Core-shell nanoresonator arrays to achieve epsilon-near-zero metamaterials Poster [Show abstract]
  • Dávid Vass, University of Szeged, Hungary
  • András Szenes, University of Szeged, Hungary
  • Emese Tóth, University of Szeged, Hungary
  • Balázs Bánhelyi, University of Szeged, Hungary
  • Mária Csete, University of Szeged, Hungary
Targets seeded with multilayers of periodic passive and active core-shell nanoresonator patterns were studied to create epsilon-near-zero materials. First, the material of the shell was selected in order to achieve near-zero permittivity at the selected wavelength in the passive target. Then, the active material around the core-shell was optimized considering the optical response, near-field enhancement and the effective parameters.
5 - Simple characterization of complex stacking of semiconductors through near field imaging and spectroscopy Poster [Show abstract]
  • Laure Tailpied, DOTA, ONERA, Université Paris Saclay, France
  • Clément Gureghian, 1Sorbonne Universit´e, CNRS, Institut des NanoSciences de Paris, France
  • Frédéric Fossard, LEM, UMR 104 CNRS-ONERA, Universit´e Paris Saclay, France
  • Jean-Sébastien Mérot, LEM, UMR 104 CNRS-ONERA, Universit´e Paris Saclay, France
  • Grégory Vincent, DOTA, ONERA, Université Paris Saclay, France
  • Thierry Talierco, IES UMR 5214, Universit´e de Montpellier, France
  • Baptiste Fix, DOTA, ONERA, Université Paris Saclay, France
Here, SNOM imaging and spectroscopy on a mechanically cleaved facet is used to characterize the different layers of a complex epitaxial heterostructures composed of a type II superlattice and heavily doped semiconductor
6 - Photoluminescence Enhancement in a Hybrid Al/Si/Ge Metasurface: Impact of Illumination Spot Size Poster [Show abstract]
  • Paul Oleynik, Brandenburgische Technische Universität Cottbus-Senftenberg, Germany
  • Diana Ryzhak, IHP–Leibniz Institut für Innovative Mikroelektronik, Germany
  • Jon Schlipf, IHP–Leibniz Institut für Innovative Mikroelektronik, Germany
  • Carlos Alvarado Chavarin, IHP–Leibniz Institut für Innovative Mikroelektronik, Germany
  • Yuji Yamamoto, IHP–Leibniz Institut für Innovative Mikroelektronik, Germany
  • Fritz Berkmann, Brandenburgische Technische Universität Cottbus-Senftenberg, Germany
  • Inga Anita Fischer, Brandenburgische Technische Universität Cottbus-Senftenberg, Germany
We investigate the μ-photoluminescence signal of a metasurface, using varying illumination spot sizes. Our results indicate that changing the number of illuminated meta-atoms can enable the investigation of finite size effects in one single metasurface as well as provide an additional degree of freedom to engineer the photoluminescence response.
7 - Dielectric Metasurfaces for Generation and Detection of Light Beams Carrying Orbital-Angular-Momentum Poster [Show abstract]
  • Arttu Nieminen, Tampere University, Finland
  • Rizwana Ahmad, University of Cambridge, UK
  • Harald Haas, University of Cambridge, UK
  • Humeyra Caglayan, Eindhoven University of Technology, The Netherlands
<p> The work presents the use of orbital angular momentum (OAM) multiplexing to enhance data bandwidth for high-speed data communication. Dielectric metasurfaces are proposed to generate and detect OAM beams, addressing challenges in integrated photonics and facilitating the development of free-space optical communication.</p>
8 - Imprinted Nanocrystalline Lithium Niobate Metasurfaces Poster [Show abstract]
  • Ulle-Linda Talts, ETH Zurich, Switzerland
  • Helena Weigand, ETH Zurich, Switzerland
  • Irene Occhiodori, ETH Zurich, Switzerland
  • Eleni Prountzou, ETH Zurich, Switzerland
  • Elise Bailley, ETH Zurich, Switzerland
  • Virginia Falcone, ETH Zurich, Switzerland
  • Rachel Grange, ETH Zurich, Switzerland
Lithium niobate is a widely used material platform in nonlinear nanophotonics but nanofabrication in this inert material is challenging. Here we present solution-derived lithium niobate for scalable bottom-up nanofabrication with imprint lithography to demonstrate nonlinear resonant and wavefront shaping metasurfaces.
9 - Second Harmonic Generation In GaAs Metasurfaces Poster [Show abstract]
  • Hugo Pitot-Belin, ONERA, France
  • Baptiste Fix, ONERA, France
  • Patrick Bouchon, ONERA, France
Nonlinear effects are useful for the generation light sources in infrared and terahertz . However, these effects are inherently weak. One method of amplifying them is to exalt the electric field in a restricted volume using metasurfaces. This article shows how second harmonic generation efficiency can be increased to 1.3.10-6 W-1 in a thin GaAs metasurface.
10 - Topological Degeneracy Induced By Twisting Poster [Show abstract]
  • han peng, Nanjing University, China
  • Qiang Wang, Nanjing University, China
  • Meng Xiao, Wuhan University, China
  • Xiayi Wang, Nanjing University, China
  • Shining Zhu, Nanjing University, China
  • Hui Liu, Nanjing University, China
In recent years, twisting has emerged as a new degree of freedom that plays an increasingly important role in Bloch bands of various physical systems.In this work, we investigated the intrinsic physical correlation between twisting and topological degeneracy.
11 - High-Quality Silica-Glass 3D-Metamaterials by Two-Photon Grayscale Lithography (2GL) Poster [Show abstract]
  • Jonathan L. G. Schneider, Karlsruhe Institute of Technology , Germany
  • Jiajie Liang, Karlsruhe Institute of Technology , Germany
  • Mirhan Özdemir, Karlsruhe Institute of Technology , Germany
  • Yi Chen, Karlsruhe Institute of Technology , Germany
  • Alexander Berkes, Karlsruhe Institute of Technology , Germany
  • Jens Bauer, Karlsruhe Institute of Technology , Germany
  • Martin Wegener, Karlsruhe Institute of Technology , Germany
We manufacture complex 3D metamaterials and microstructures composed of silica glass using a polyhedral oligomeric silsesquioxane (POSS)-based resist and two-photon grayscale lithography (2GL). The results exhibit optical-grade surfaces and mechanical damping much lower than polymer structures.
12 - Sharpening Conducting Polymer Plasmonics through Nonlocal Coupling Poster [Show abstract]
  • Dongqing Lin, Linkoping University, Sweden
  • Yulong Duan, Linkoping University, Sweden
  • Pravallika Bandaru, Linkoping University, Sweden
  • Mohammad Shaad Ansari, Linkoping University, Sweden
  • Alexander Polyakov, Linkoping University, Sweden
  • Janna Wilhelmsen, Linkoping University, Sweden
  • Magnus Jonsson, Linkoping University, Sweden
Conducting polymers can enable active plasmonics and metasurfaces but typically suffer from large losses. I will show how we address this through nonlocal coupling, leading to dramatically improved quality factor and modulation during redox-switching. I will also discuss the choice of polymers including possibilities with strained polymers with hyperbolic permittivity.
13 - A Low-Cost and Low-Profile 2-bit Metasurface Antenna Poster [Show abstract]
  • Ge Fan, Southeast University, China
  • Hui Dong Li, Southeast University, China
  • Jun Yan Dai, Southeast University, China
  • Shuo Liu, Southeast University, China
  • Jun Wei Wu, Southeast University, China
  • Qiang Cheng , Southeast University, China
A low-cost and low-profile 2-bit metasurface antenna with attractive beam scanning capability is presented in this work. The antenna element is implemented with four PIN diodes, so as to realize the 2-bit phase shifting. Specifically, by controlling the working states of the PIN diodes, the antenna element obtains four transmission phase states (0°, 90°, 180°, and 270°). Additionally, thanks to the careful design, the metasurface antenna has a profile with only one wavelength. For verification, a metasurface antenna with 10×10 elements is designed and simulated, obtaining a 29.3% aperture efficiency, a 3dB gain bandwidth of 10%, and a beam scanning range up to 60°. The 2-bit metasurface antenna proposed in this paper is potentially competitive in the field of satellite communication and radar systems.
14 - Tunable VO₂ Films for Hyperbolic Metamaterials via In-Situ Reactive Magnetron Sputtering Poster [Show abstract]
  • Katarína Rovenská, Brno University of Technology, Central European Institute of Technology, Czech Republic
  • Tereza Bačová, Brno University of Technology, Faculty of Mechanical Engineering, Institute of Physical Engineering, Czech Republic
  • Filip Ligmajer, Brno University of Technology, Central European Institute of Technology; Brno University of Technology, Faculty of Mechanical Engineering, Institute of Physical Engineering, Czech Republic
  • Thomas Possmayer, Ludwig-Maximilians Universität München, Faculty of Physics, Nanoinstitute Munich, Chair in Hybrid Nanosystems, Germany
  • Manobina Karmakar, Ludwig-Maximilians Universität München, Faculty of Physics, Nanoinstitute Munich, Chair in Hybrid Nanosystems, Germany
  • Leonardo de Souza Menezes, Ludwig-Maximilians Universität München, Faculty of Physics, Nanoinstitute Munich, Chair in Hybrid Nanosystems; Universidade Federal de Pernambuco, Departamento de Física, Germany; Brazil
  • Tomáš Šikola, Brno University of Technology, Central European Institute of Technology; Brno University of Technology, Faculty of Mechanical Engineering, Institute of Physical Engineering, Czech Republic
Hyperbolic metamaterials (HMMs) require tunability for advanced applications. Ag/VO₂ multilayers, fabricated via reactive magnetron sputtering with in-situ heating, achieve reconfigurable optical behavior via the phase transition of VO₂. This transition-driven tunability paves the way for actively controlled HMMs, expanding their application potential in nanophotonics.
15 - Investigating The Potential Of Electro-Optical Tuning Of Circular Aperture-Based Extraordinary Optical Transmission Multilayers Poster [Show abstract]
  • Hanan Alhesseny, Newcastle University, United Kingdom
  • Christian Johnson-Richards, Newcastle University, United Kingdom
  • Ross Glyn MacDonald, Newcastle University, United Kingdom
  • Noel Healy, Newcastle University, United Kingdom
  • Toby Hallam, Newcastle University, United Kingdom
  • Victor Pacheco-Peña, Newcastle University, United Kingdom
This study examines the design of a multilayered structure made of alternating silver and SiO2 layers having perforated subwavelength holes. In so doing, Extraordinary Optical Transmission peaks are excited. It is then placed on top of Lithium Niobate to explore the tunable properties of the structure working at telecom wavelengths.
16 - A Flexible Metasurface for MRI Enhancement Based on Flexible Electronic Printing Technology Poster [Show abstract]
  • Qingdong Cai, southeast university, china
  • Xiaojian Fu, southeast university, china
Conventional metasurfaces frequently employ rigid structures, which impede their ability to achieve exceptional conformality and render them more susceptible to damage during bending. We have delved into flexible electronic printing technology for fabrication of flexible metasurface. The flexible metasurface can be adapted to the MRI coil to enhance the SNR.
17 - On the Use of Reconfigurable Metasurfaces in Compressive Sensing Applied to Atmospheric Trace Gas Recognition Poster [Show abstract]
  • Sebastian Falckenheiner, Dutch Organization for Applied Scientific Research (TNO) and Eindhoven University of Technology (TU/e), Netherlands
  • Kim Bui, Dutch Organization for Applied Scientific Research (TNO) and Delft University of Technology (TU Delft), Netherlands
  • Giampiero Gerini, Dutch Organization for Applied Scientific Research (TNO) and Eindhoven University of Technology (TU/e), Netherlands
In this paper, we propose a reconfigurable metasurface filter in the short-wave infrared band, as an enabling component of a space instrument for atmospheric trace gases detection, based on a compressive sensing approach. Its performance is analysed considering the effect of noise in a typical space instrument configuration. The final results show that the reconstruction possesses de-noising capabilities.
18 - 3D printed THz Aplanatic Metalens for Achromatic focusing with High-Resolution Poster [Show abstract]
  • Jin Chen, City University of Hong Kong, Hong Kong
  • Geng-Bo Wu, City University of Hong Kong, Hong Kong
  • Chi-Hou Chan, City University of Hong Kong, Hong Kong
Inspired by optical metalens, terahertz (THz) metalenses have been developed rapidly in the last decade. Numerous functionalities, such as achromatic focusing and super-resolution imaging, were realized. However, previous works have concentrated on eliminating chromatic aberrations, while accomplishing aberration-free THz metalens in both chromatic and spherical aberration is still a big challenge. In this paper, an aplanatic achromatic THz metalens with a large numerical aperture (NA) of 0.61 is achieved by gradient metamaterials and fabricated by 3D printing. Measured results demonstrate that spherical aberration-free achromatic focusing with a full width at half maximum (FWHM) of about 0.82λ is fulfilled in the range of 0.1THz to 0.6THz.
19 - Distorted OAM Mode Sorting by Diffractive Neural Network Poster [Show abstract]
  • Cherry Park, POSTECH, Korea (South)
Orbital Angular Momentum (OAM) has emerged as a promising candidate for high-capacity optical communication, yet practical OAM demultiplexing remains challenging due to beam misalignment and the complexity of conventional methods relying on bulky diffractive optical elements. To address these limitations, we propose a metasurface-based OAM demultiplexer optimized using Diffractive Neural Networks (DNN). This approach enables the simultaneous demultiplexing of 8 OAM modes while maintaining high accuracy even under beam misalignment and rotation. The proposed method offers a compact and efficient solution, advancing the practical deployment of OAM-based communication systems.
20 - Learning-Based Meta-Optics for Computational Microscopy Poster [Show abstract]
  • Ipek Anil Atalay Appak, Tampere University, Finland
  • Erdem Sahin, Tampere University, Finland
  • Christine Guillemot, INRIA, France
  • Humeyra Caglayan, Eindhoven University of Technology, The Netherlands 
<p> Multi-spectral fluorescence microscopy is crucial for sub-cellular analysis but is limited by chromatic aberration and shallow depth of field (DOF). This work introduces a 4f microscopy-based, end-to-end optimized meta-optics framework that integrates a learning-based reconstruction algorithm to correct aberrations and extend DOF across a broad spectral range.</p>
21 - Light field Microscopy for Snapshot Volumetric Imaging Poster [Show abstract]
  • Haobijam Johnson Singh, Tampere University, Finland
  • Jani Makinen , Tampere University, Finland
  • Anil Appak, Tampere University, Finland
  • Erdem Sahin, Tampere University, Finland
  • Atanas Gotchev, Tampere University, Finland
  • Teemu Ihalainen, Tampere University, Finland
  • Humeyra Caglayan, Eindhoven University of Technology, Netherlands
Light field microscopy offers a scanning-free imaging technique capable of recording volumetric images in a single snapshot with a low light dose making it ideal for capturing dynamics of live biological specimens Integrating with novel meta-optics could potentially enhanced the spatial resolution with extended depth of field.
22 - Dual-Band Angle Insensitive Metamaterial Absorber for Microwave Sensor Applications Poster [Show abstract]
  • Bahar Ila, Konya Technical University, Turkey
  • Ercan Yaldiz, Konya Technical University, Turkey
  • Emin Unal, Necmettin Erbakan University, Turkey
This work presents an angle-insensitive dual-band metamaterial absorber for microwave sensor applications. The percentage of absorption rates for the proposed MMA at 3.06 GHz and 5.8 GHz are 93.62% and 99.01%, respectively. Also, MMA has been investigated for sensor applications by changing permittivity between 1 and 10. Frequency sensitivity have been obtained 550 MHz at the first resonance and 1 GHz at the second resonance.
23 - Direction-of-Arrival Estimation Based On Radiative Space-Time-Coding Digital Metasurface Poster [Show abstract]
  • Xiaoyue Shen, Southeast University, China
  • Shuang Peng, Southeast University, China
  • Qian Yu, Southeast University, China
  • Han Zhang, Southeast University, China
  • Fei Yang, Southeast University, China
A direction-of-arrival (DOA) estimation method based on radiative space-time-coding digital metasurfaces is proposed. Experimental results demonstrate that the proposed method achieves accurate DOA estimation with an error margin of less than 1°, validating its high precision and feasibility, and paving the way for future integrated communication and sensing systems.
24 - Neural Network Based Remote Localiser for Two Objects Poster [Show abstract]
  • Georgiana Dima, University of Oxford, Department of Engineering Science, United Kingdom
  • Christopher J. Stevens, University of Oxford, Department of Engineering Science, United Kingdom
  • Huirui Dai, University of Oxford, Department of Engineering Science, United Kingdom
<p> This work presents a neural network-based method for localising two identical objects on a 2D metamaterial array using single-port S11 measurements. A robotic arm was used to automate data collection across all object combinations. Three tasks were demonstrated: single-object localisation, two-object localisation, and classification of the number of objects on the array. The network achieved 100% accuracy for single-object localisation, 99.9% for two-object localisation, and 99.6% for classifying surface states. These results confirm the feasibility of scalable, single-port localisation for multiple objects using machine learning.</p>
25 - Plasmonic structure integrated superconducting BSCCO nanowire single-photon detector compatible with He-ion lithography Poster [Show abstract]
  • András Szenes, University of Szeged, Hungary
  • László Pothorcki, University of Szeged, Hungary
  • Balázs Bánhelyi, University of Szeged, Hungary
  • Mária Csete, University of Szeged, Hungary
Single-photon detection is essential for quantum communication and computing. Superconducting nanowire single-photon detectors (SNSPDs) offer high efficiency and fast response but require cryogenic temperatures, limiting their practical use. This study focuses on BSCCO-based SNSPDs integrated with plasmonic structures to enhance its absorption and improve detection efficiency. By integrating one-dimensional wavelength-scaled periodic plasmonic patterns high detection efficiency is achieved, making these detectors more suitable for real-world applications.
14:00 - 15:30 - Oral Sessions (Thursday Afternoon)
14:00 - Special session: Metamaterials and Sustainable Energy 2

Organizer(s): Albert Polman; Esther Alarcon-Llado

Session chairperson(s): Albert Polman; Esther Alarcon-Llado

14:00 - 14:30 - Controlling Optical Near Fields for Sustainable Energy Generation Invited oral [Show abstract]
  • Albert Polman, AMOLF, Netherlands
We present novel advances in the design and fabrication of optical metamaterials to realize ultra-high-efficiency photovoltaics and light-driven sustainable chemical reactions.re
14:30 - 15:00 - Fundamentals And Applications Of Free Space Diffuse Irradiance Collimation For Enhancing Photovoltaic Yield Invited oral [Show abstract]
  • Rebecca Saive, University of Twente, Netherlands
This work explores an optical metamaterial for redirecting diffuse sunlight to PV panels. Using free-space luminescent solar concentrators (FSLSCs), the system employs polymer waveguides, photon recycling, and a spectro-angular notch filter to produce collimated 'cold photons,' enhancing PV efficiency, particularly in winter conditions.
15:00 - 15:30 - Panel Discussion Round Table Discussion [Show abstract]
  • Albert Polman, AMOLF, The Netherlands
  • Esther Alarcon-Llado, AMOLF, The Netherlands
  • Georgia Theano Papadakis, ICFO, Spain
  • Harry Atwater, California Institute of Technology, USA
  • Giulia Tagliabue, EPFL, Switzerland
  • Rebecca Saive, University of Twente, The Netherlands
Panel chaired by Albert Polman and Esther Alarcon-Llado.
14:00 - Controlling Shocks and Vibrations & Soft Robotics

Session chairperson(s): Varvara Kouznetsova; José Bico

14:00 - 14:30 - Zero-space Waveguide Arrays for Flexural Waves Invited oral [Show abstract]
  • Ying Wu, KAUST, Saudi Arabia
Zero-space waveguide arrays (ZSWAs) enable ultra-compact waveguides without bulky cladding. We extend ZSWA principles to flexural waves, overcoming evanescent-to-propagating conversion limitations by altering obstacles. This approach advances elastic waveguide design, optimizing confinement and guiding efficiency in thin elastic plates.
14:30 - 14:45 - Conceptual Design and Dynamic Evaluation of Car Bumper Beams Utilizing Negative Stiffness Metamaterials Oral [Show abstract]
  • Ali Cherif Messellek, École Militaire Polytechnique, Algeria
  • Mohammed Amine Serir, École Militaire Polytechnique, Algeria
  • Mohand Ould Ouali, University of Tizi-Ouzou, Algeria
  • Abdelghani May, École Militaire Polytechnique, Algeria
This study proposes novel designs of car bumper beams utilizing negative stiffness metamaterials (NSMM) to enhance crashworthiness under low-velocity impacts. Through finite element analysis, the energy absorption performance of conventional beams, NSMM-reinforced interior designs, and NSMM-reinforced exterior designs was evaluated for multiple material combinations. The results reveal that NSMM-reinforced interior designs significantly improve energy dissipation, with configurations like Aluminum/Aluminum achieving a 60% increase over conventional designs. NSMM-reinforced exterior designs, while exhibiting variability, demonstrate potential for modular and targeted applications. Additionally, hybrid material combinations, such as Magnesium/Polymer, highlight the adaptability of NSMM for lightweight, high-performance designs. These findings validate the effectiveness of the proposed NSMM-based bumper beams in meeting and exceeding safety standards, offering a transformative approach to vehicle safety and sustainability.
14:45 - 15:00 - Mechanically and Thermally Robust Metastructures for Optimized Reflective Metasurfaces in Urban Wireless Networks Oral [Show abstract]
  • Hasan N. Olmez, University of Trento, Italy
  • Tugberk Guner, University of Trento, Italy
  • Oreste S. Bursi, University of Trento, Italy
  • Giacomo Oliveri, University of Trento, Italy
The smart electromagnetic environment (SEME) paradigm enhances wireless systems using reconfigurable intelligent surfaces (RISs). However, their performance is sensitive to mechanical and thermal deformations. We propose an auxetic metastructure with near-zero Poisson ratio and thermal expansion, ensuring dimensional stability. This improves signal redirection and network robustness in smart cities.
15:00 - 15:15 - Metamaterial-based Soft Grippers for Handling Delicate Objects Oral [Show abstract]
  • Ioannis Spanos, University of Groningen, Netherlands
  • Ajay Kottapalli, University of Groningen, Netherlands
  • Anastasiia Krushynska, University of Groningen, Netherlands
In this work, soft grippers with integrated mechanical metamaterials is investigated. Currently there is no established methodology for quantitatively assessing their performance. The contact area between the gripper and a test object is proposed as a potential metric to address this gap. Numerical analysis is conducted on two meta-grippers.
15:15 - 15:30 - Analysis of Acoustic Excitation Effects on Vibroacoustic Metamaterial Plates Oral [Show abstract]
  • Jakob Mildenberger, Technical University of Darmstadt, Department System Reliability, Adaptive Structures, and Machine Acoustics SAM, Germany
  • Davide Esposito, Technical University of Darmstadt, Department System Reliability, Adaptive Structures, and Machine Acoustics SAM, Germany
This study investigates the impact of acoustic excitation on the structural response of a vibroacoustic metamaterial using a finite element model. A synthetic acoustic pressure field is generated by an array of monopole sound sources, with phase shifts between the sources systematically varied. Results show that while in-phase excitation produces a response similar to that of a two-mass oscillating system, introducing phase shifts between excitation sources from 90° to 135° results in a defined stopband and improved vibration attenuation, with the maximum vibration reduction observed close to 90° phase shift. These findings indicate that the spatial distribution of the excitation highly influences the efficacy of vibration attenuation in VAMM plates.
14:00 - Temporal Metamaterials II

Session chairperson(s): Vincenzo Galdi; Amir Shlivinski

14:00 - 14:30 - Circuit-Based Metasurfaces Varying in Time and Space without Additional Power Supply Invited oral [Show abstract]
  • Hiroki Wakatsuchi, Nagoya Institute of Technology, Japan
We present circuit-based metasurfaces varying in the time domain even at the same frequency according to the incoming pulse width. Importantly, our metasurfaces break classic LTI nature and attain unique properties and phenomena, e.g., passive yet reconfigurable radiation patterns, spatially interlocked multipath filters, pulse division multiplexing, and frequency-hopping wave engineering.
14:30 - 15:00 - Negative Capacitors through Floquet Engineering Invited oral [Show abstract]
  • Dimitrios Sounas, Wayne State University, USA
We present an approach to realize negative capacitor by using time periodic modulation. The proposed approach leads to the same response as one would expect from a negative capacitor, is scalable in frequency, and applicable in various scenarios where negative capacitors could be needed.
15:00 - 15:30 - Wave Propagation in Time-Varying Media: The First 35 Years Extended oral [Show abstract]
  • Gennady Shvets, Cornell University, USA
Some of the early history of time-varying media plasmas will be reviewed, with the emphasis on the underlying microscopic description of the media and the resulting conservation laws. I will then discuss how dielectric metasurfaces can be used to produce a wide range of optical phenomena, including: time-steps, negative refraction, and phase front reversal.
14:00 - Design and Characterizaton of Microwave Metadevices

Session chairperson(s): Alex Schuchinsky; Zvonimir Šipuš

14:00 - 14:15 - An Inverse Source Approach to Inexpensive Static Passive EMS Design Oral [Show abstract]
  • Giacomo Oliveri, ELEDIA@UniTN-DICAM, University of Trento, Italy
  • Francesco Zardi, ELEDIA@UniTN-DICAM, University of Trento, Italy
  • Aaron Angel Salas Sanchez, ELEDIA@UniTN-DICAM, University of Trento, Italy
  • Giorgio Gottardi, ELEDIA@UniTN-DICAM, University of Trento, Italy
  • Andrea Massa, ELEDIA@UniTN-DICAM, University of Trento, Italy
Electromagnetic Skins (EMSs) are key enablers in the development of Smart Electromagnetic Environments (SEMEs), offering reconfigurable and energy-efficient solutions for wave manipulation. This work presents a novel methodology to enhance the performance of low-cost, static passive EMSs (SP-EMSs). The proposed approach exploits the decomposition of the surface currents as a combination of pre-image (PI) and null-space (NS) components. The resulting optimization process aims to minimize the mismatch between the ideal surface current, which radiates the desired target field, and the actual current distribution on the EMS. A proof-of-concept experiment is shown to demonstrate the feasibility and effectiveness of the method in synthesizing SP-EMSs realized using conductive ink on a standard paper substrate.
14:15 - 14:30 - Parity Time Epsilon-Near-Zero systems: a preliminary stability analysis Oral [Show abstract]
  • Boris Okorn, University of Zagreb, Croatia
  • Victor Pacheco-Peña, Newcastle University, United Kingdom
  • Silvio Hrabar, University of Zagreb, Croatia
We report on the stability analysis of a parity-time (PT) symmetric system where gain and loss layers are separated by a section of epsilon-near-zero (ENZ) waveguide. In this PT-ENZ system, gain and loss layers are modelled as lumped elements (i.e. as having zero thickness). Stability analysis is performed using the normalized determinant function (NDF). Our analysis demonstrates stable behavior, proving a feasibility of practical PT-ENZ based systems.
14:30 - 14:45 - Radio-Frequency Mie Scattering from High-Permittivity Dielectric Spheres Oral [Show abstract]
  • Alessandra Contestabile, University of L’Aquila, Department of Physical and Chemical Sciences, Italy
  • Angelo Galante, University of L’Aquila, Department of Life, Health and Environmental Sciences, Italy
  • Angela Capocefalo, University of L’Aquila, Department of Physical and Chemical Sciences, Italy
  • Vincenzo Galdi, University of Sannio, Department of Engineering, Fields & Waves Lab, Italy
  • Marcello Alecci, University of L’Aquila, Department of Life, Health and Environmental Sciences, Italy
  • Carlo Rizza, University of L’Aquila, Department of Physical and Chemical Sciences, Italy
We experimentally investigate Mie resonances in a high-permittivity dielectric sphere operating in the radio-frequency (RF) regime. By measuring S-parameters, we clearly identify RF Mie resonances in a high-index ceramic sphere exhibiting small electromagnetic loss. Our findings provide valuable insights for developing new techniques to manipulate RF waves, which could have potential applications in magnetic resonance imaging.
14:45 - 15:00 - An Analytic Design Approach for Conformal Leaky Wave Antennas Oral [Show abstract]
  • Afshin Abbaszadeh, Virginia Tech, USA
  • Jordan Budhu, Virginia Tech, USA
A fully analytic approach is presented for the design of a sinusoidally shaped conformal Leaky Wave Antenna (LWA). The approach is based on differential geometry formulations of arc-lengths and ray tangents for conformal rays emanating from a central feed pin. A Voronoi patterning technique is used to realize the necessary surface impedance to generate a far-field beam in a desired direction as obtained from the holography approach. Full-wave simulations validate the design. The analytic design approach presented paves the way for conformal LWA designs without the need to incorporate costly full-wave simulations into the design stage.
15:00 - 15:15 - Multi-Photon Lithography On Thin Films For Efficient Fabrication Of 2D And 2.5D Meta-Atoms Oral [Show abstract]
  • Savvas Papamakarios, IESL/FORTH, N. Plastira 100, 70013, Heraklion, Greece , Greece
  • Gordon Zyla, IESL/FORTH, N. Plastira 100, 70013, Heraklion, Greece , Greece
  • Dimitrios Zografopoulos, Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, Rome, Italy
  • Anna Christoforidou, Lund University, Faculty of Engineering, Lund, Sweden
  • George Kenanakis, IESL/FORTH, N. Plastira 100, 70013, Heraklion, Greece , Greece
  • Maria Farsari, IESL/FORTH, N. Plastira 100, 70013, Heraklion, Greece , Greece
  • Odysseas Tsilipakos, Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens, Greece
Fabrication of metasurfaces using film-assisted Multi-photon Lithography for high quality 2D and 2.5D structures using a fast, cheap and novel approach. High resolution structures are demonstrated and the process is supported by THz and mid-IR applications.
15:15 - 15:30 - Postgraduate Teaching in Metamaterial Engineering: the M3 Program Oral [Show abstract]
  • Rossano Albatici, University of Trento, Italy
  • Oreste Bursi, University of Trento, Italy
  • Giacomo Oliveri, ELEDIA@UniTN-DICAM, University of Trento, Italy
  • Alessandro Pegoretti, University of Trento, Italy
  • Paolo Rocca, ELEDIA@UniTN-DICAM, University of Trento, University of Trento
  • Andrea Massa, ELEDIA@UniTN-DICAM, University of Trento, Italy
With the growing research and industrial applications of Metamaterials (MTM), interest in MTM education is steadily increasing across multiple disciplines. Unlike conventional subjects, MTM education demands a multidisciplinary approach, integrating fundamental and advanced concepts from electromagnetics, mechanics, acoustics, electronics, materials science, and structural engineering. This talk presents the approach and the learning process introduced in the Postgraduate Program in Multifunctional Metamaterials and Metastructures, a recently introduced didactic initiative at the University of Trento.
14:00 - Nanophotonic Sensing and Characterization

Session chairperson(s): Maria Farsari; Nasim Mohammadi Estakhri

14:00 - 14:30 - Imaging, Sensing, and Wearable Devices Using Nanophotonic Platforms Invited oral [Show abstract]
  • Yang Zhao, University of Illinois Urbana Champaign, USA
We develop nanophotonic instruments and devices for early diagnosis and health monitoring. These platforms enable nanomaterial characterization, chiral molecular sensing, and wearable physiological monitoring. I will discuss ultrafast optical force nanoscopy for nanometer-scale, nanosecond-resolved thermal imaging of nanodevices, as well as wearable metasurface-enabled implantable sensors for tracking brain activity.
14:30 - 14:45 - Towards Using Angle-resolved Cathodoluminescence Interferometry For 3D Reconstruction Of Nanoscale Geometries Oral [Show abstract]
  • Sam Borman, AMOLF, Netherlands
  • Evelijn Akerboom, AMOLF, Netherlands
  • Daphne Dekker, AMOLF, Netherlands
  • Matthias Liebtrau, AMOLF, Netherlands
  • Albert Polman, AMOLF, Netherlands
We present a novel method to reconstruct the 3D geometry of nanoscale objects in a SEM. We do this by analyzing the interference pattern generated when coherent cathodoluminescence scatters of a nanostructure. This provides a fast, high-resolution tomography method with potential applications in the field of semiconductor device inspection.
14:45 - 15:00 - Pump-probe Cathodoluminescence Of Resonant Silicon Nanospheres For Nanothermometry Oral [Show abstract]
  • Saskia Fiedler, NWO-Institute AMOLF, Netherlands
  • Loriane Monin, NWO-Institute AMOLF, Netherlands
  • Hiroshi Sugimoto, Kobe University, Japan
  • Minoru Fujii, Kobe University, Japan
  • Wiebke Albrecht, NWO-Institute AMOLF, Netherlands
  • Albert Polman, NWO-Institute AMOLF, Netherlands
We control and probe optical Mie resonances in 200-nm-diameter single Si nanospheres using a novel pump-probe cathodoluminescence (CL) spectroscopy technique. We couple a 442 nm laser into the SEM-CL system to locally heat individual NPs and observe a thermally driven spectral shift of Mie modes in CL.
15:00 - 15:30 - Breaking the limit of exception point generation in a single chip Invited oral [Show abstract]
  • Abdoulaye Ndao, University of California, San Diego, USA
We propose a new paradigm for implementing non-Hermitian transformations in a programmable scheme that breaks the limit of Exceptional Points generation in a single chip.
15:30 - 16:00 - Coffee Break (Thursday Afternoon)
16:00 - 17:00 - Plenary Session V
16:00 - Plenary Session V

Session chairperson(s): Jorik van de Groep

16:00 - 17:00 - Inverse Designed, Densely Integrated Classical and Quantum Photonics Plenary [Show abstract]
  • Jelena Vuckovic, Stanford University, USA
Recent breakthroughs in photonics design, along with new nanofabrication approaches and heterogeneous integration play crucial roles in building photonics for applications including optical interconnects and quantum technologies. This design breakthrough is named photonic inverse design, and refers to efficiently searching through the space of all possible photonic device geometries, within fabrication constraints, and by employing fast electromagnetic solvers and optimization tools. Additionally, new photonic platforms have been developed which enable functionalities beyond silicon on insulator, including silicon carbide, diamond, and Titanium:sapphire on insulator, as well as ultra-strong electro-optic materials, such as strontium and barium titanate. With these new approaches to design and fabrication, novel optoelectronic devices and systems have been designed and demonstrated, including error-free and fast chip-to-chip and on-chip optical interconnects compatible with commercial foundries, chip scale Ti:sapphire lasers and amplifiers, CMOS compatible isolators and laser frequency stabilizers, and silicon carbide and diamond chip-scale quantum technologies.
17:00 - 17:30 - Closing Ceremony

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