2nd COLLOQUIUM ON THE PHYSICS AND APPLICATIONS OF METASURFACES

Fortezza da Basso, Florence, Italie, July 18-22 2022

Scientific committee

• Prof. Giuseppe Leo, Chair, Université Paris Cité, France
• Prof. Costantino De Angelis, Co-Chair, Università di Brescia, Istituto Nazionale di Ottica - Consiglio Nazionale delle Ricerche, Italy
• Dr. Patrice Genevet, Program Chair, CNRS-CHREA & Université Côte d’Azur, France

Organizing committee

• Prof. Rita Asquini, Università La Sapienza, Italy
• Dr. Sébastien Cueff, CNRS, INL-ECL, France
• Dr. Stéphane Lanteri, INRIA, France

This 2nd COLLOQUIUM was a great success with 97 attendees, the double of Cargese.

Announcement of the awards made by Prof. Zentgraf.
From left to right: 1st prize (G. Crotti), 2nd prize (M. Weissflog), 3rd prize (S. Sideris)

Andrea Alù
CUNY

Shanui Fan
Stanford University

 Federico Capasso
Harvard University 

Philippe Lalanne
CNRS Bordeaux

Anatoly Zayats
King's College London

Conventional optical components control light using gradual phase accumulation through propagation in refractive materials. Recently, ultrathin optical interfaces capable of controlling the light properties, including amplitude - phase - polarization and the dispersion of light, have been proposed for mid-infrared and optical wavelengths. These devices, called metasurfaces, rely on the scattering properties of ultrathin subwavelength scale optical resonators patterned at interfaces. The design was influenced by the ability to control scattering of light from wavelength-scale dielectric or metallic nanoparticles in the resonant scattering regime or in the non-resonant one using the geometric phase. Since about ten years, the concept of metasurfaces has gained considerable attention in the optics community, offering new perspectives for the realization of optical components with unexpected optical functionalities. Devices such as holograms, polarimeters, cameras, lasers with arbitrary wavefronts, polarization sensitive imaging, nonlinear and quantum optical components with extended functionalities have been proposed. 

The purpose of this workshop is to gather the academic community working on metasurfaces, after the first successful edition. The topics of interests are fundamental principles and technological applications of metasurfaces, targeting new phenomena and advanced optical functionality of metasurfaces, with a careful attention on their applications in realistic optical systems.

The workshop contains special sessions addressing both scientific and industrial purpose and an educational afternoon session with a young research forum. The workshop consists of conventional presentations, including 5 special sessions involving academics and industrials (Monday, Tuesday, Wednesday, Thursday morning and Friday morning), and one afternoon (Thursday) devoted for graduate students and postdocs to present their own work in a non-intimidating environment, to build collaborative networks with their peers, and prepare them for active participation to the scientific community. Every day, two main research topics will be considered with a morning and an afternoon dedicated session. A tutorial/keynote presentation has been selected to present and introduce the subject.

Mon 18/07                                                                                                              

• 08:00-08:30     Welcome and workshop introduction
• 08:30-09:30     A. Alù                       Engineered nonlocalities in optical metasurfaces: fundamentals and applications
• 09:30-10:00     N. Bonod                Analysis of the optical response of Mie-resonant scatterers and metasurfaces via the singularities of the S-Matrix
• 10:00-10:30     K. Achouri               Spatial Symmetries in Multipolar Metasurfaces                       
• 11:00-11:30     R. Colom                  The topological origin of a universal 2π-phase retardation in non-Hermitian metasurfaces
• 11:30-12:00     M. Elsawy                 Universal active metasurface control with ultimate performance in reflection                        
• 14:00-14:30     A. Baron                  Self-assembled meta-atoms and metasurfaces : Huygens multipoles and homogenization problems
• 14:30-15:00     C. Gigli                      Fundamental limitations of Huygens’ metasurfaces            
• 15:30-16:00     J. Rho                        Breaking the capacity limit of metasurfaces using inverse design
• 16:00-16:30     A. Calà Lesina          Large-scale inverse design of dispersive nanophotonic structures
• 16:30-17:00     A. Borne                   Modeling spontaneous photon-pair generation at the nanoscale

Tue 19/07          

• 08-30-09:00    P. Bouchon            Thermal emission of light by nanoantennas
• 09:00-09:30     R. Asquini               Plasmonic metasurfaces and periodic nanostructures for nanophotonic biosensors
• 09:30-10:00     A. De Rossi             Nanoscale Optical Parametric Sources
• 10:00-10:30     A. Degiron              Optoelectronic metasurfaces for the spontaneous emission of structured light       
• 11:00-11:30     J. Vukovic                Inverse design of large area integrated photonics and metasurfaces
• 11:30-12:00     I. Favero                  Chains and arrays of resonators in optomechanics           
• 14:00-15:00     F. Capasso              Recent advances in flat optics : from structured light and dark to metasurfaces for communications and high-volume applications
• 15:30-16:00     C. Seassal                Metasurfaces and photonic mode engineering for photocatalysis
• 16:00-16:30     M. Petrov                Thermooptical bistability enabled with high-Q states in all-dielectric nanostructures
• 16:30-17:00     T. Zentgraf              Cascaded metasurface holography for optical secret sharing

Wed 20/07              

• 08:30-09:30     S. Fan                       Nonlocal metasurface: topological physics and image processing applications
• 09:30-10:00     G. Della Valle          Ultrafast all-optical control of light with plasmonic metasurfaces
• 10:00-10:30     J.-M.Gérard             Ultrafast all-optical tuning of semiconductor microcavities and metasurfaces               
• 11:00-11:30     S. Cueff                    Multilevel non-volatile tuning of metasurfaces with Phase-Change Materials
• 11:30-12:00     D. Neshev               Tunable metasurfaces for amplitude and phase modulation          
• 14:00-14:30     M. Celebrano         Controlling the Second Harmonic Generation from nanoantennas and metasurfaces
• 14:30-15:00     L. Carletti                 Nonlinear frequency generation and reconfigurability in dielectric Mie-resonant nanostructures            
• 15:30-16:00     H. S.  Nguyen          Quasi-BIC microlaser:  beaming with style in active resonant metasurface
• 16:00-16:30     C. Kyrou                   Liquid-crystal active metasurfaces
• 16:30-17:00     S. Maci                     Self complementary metasurfaces

Thu 21/07           

• 08:30-09:00     Genevet                 
• 09:00-09:30     Ambrosio              
• 09:30-10:00     T.Ellenbogen          Tailored THz generation by nonlinear metasurfaces
• 10:00-10:30     O. Martin                Nonlinear metasurfaces         
• 11:00-11:30     M. Finazzi               Nonlinear emission from plasmonic and dielectric nanoantennas by dual-beam pumping
• 11:30-12:00     T. Pertsch                LNOI quantum metasurfaces

Fri 22/07                      

• 08:30-09:00     M. Tamagnone      Supercell metasurfaces for optoelectronic applications
• 09:00-10:00     P. Lalanne               Visual appearance of metasurfaces composed of Mie or plasmonic nanoresonators
• 10:00-10:30     A. Fratalocchi         Universal light encoders for next generation artificial intelligent hardware in optical systems and hyperspectral imaging                  
• 11:00-11:30     A. Ambrosio           Optical vortex crystals with dynamic topologies
• 11:30-12:00     M. Agio                   Optical properties of thin diamond membranes: opportunities for metasurfaces
• 12:00-12:30     Workshop conclusion

Monday 18 July: the first session is entitled “Fundamentals of metasurfaces”. The development of metasurfaces and their current deployment in real world applications require proper understanding of the underlying physical mechanisms, new design method leading to high efficient and reliable devices and proper simulation methods. Monday session will be devoted to the introduction of those basic concepts and the theoretical development in the field. Recent advances on theoretical modelling (FDTD/FEM methods, optimization and inverse design methodologies, e.g., with gradient-based, evolutionary and machine learning algorithms), and their impact on experimental design will be presented. 

Tuesday 19 July: the second session is entitled “New functionalities of metasurfaces 1”. In this session, we will discuss new principles, technological and emerging applications, trying to emphasize practical developments of metasurface prototypes in imaging systems, sensing, communication system, quantum optics, optomechanics, polarimetry and data storage. We consider as well new materials, structures, and advanced optical functionalities of metasurfaces. 

Wednesday 20 July: the third session is entitled “New functionalities of metasurfaces 2”. In this session we discuss passive and active nanophotonics. We will present new developments of metasurfaces and their deployment in real world applications, which require scalable nanofabrication methods able to reproduce a large number of devices. Materials for metasurfaces (e.g., 2D materials, oxides/nitrides, phase-change materials, high-index dielectrics) will be discussed.

Thursday 21 July: the fourth session is entitled “Nonlinear metasurfaces”. We will discuss innovative nonlinear light manipulation with nanostructures and nonlinear metasurfaces. In the afternoon, the students will organize the “Young research forum”. The afternoon will include the poster session, with prestigious prizes provided by NATO and the Nanophotonics journal. The day will end with the Conference Dinner.

Friday 22 July: the fifth and last session is entitled “Perspectives, devices and applications”. This last morning will be devoted to emerging applications. It is a more transversal session, opened to topics susceptible of further widening the research directions and exploring the potential impact of metasurfaces and metamaterials in other fields of research. 

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Registration: April 15 - June 15, 2022

Registration fee : 350€

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This colloquium is organized by the Nanophotonics club of the Société Française d’Optique

The Nanophotonics Club is focused on the interactions of light with structured matter at a sub-wavelength scale. This structuring, made possible by advances in modeling and nanofabrication, can thus give rise to plasmonic effects as well as metamaterial/metasurface behaviors. These objects enhance physical phenomena including e.g. nonlinear, quantum and thermal effects. Their study is thus inherently interdisciplinary.