Plenary Event
Hot Topics III
icon_in-person.svgIn person: 7 April 2022 • 09:00 - 10:35 CEST | Schweitzer Auditorium, Niveau/Level 0 
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Welcome and opening remarks
Thierry Georges, Oxxius (France)
2022 Symposium Chair

A sneak peek with light into opaque materials: from imaging to computing

Sylvain Gigan, Sorbonne Univ. (France) and Lab. Kastler-Brossel, ENS (France)

Light propagation in complex media, such as paint, clouds, or biological tissues, is a very challenging phenomenon, encompassing fundamental aspects in mesoscopic and statistical physics. It is also of utmost applied interest, in particular for imaging. Wavefront shaping has revolutionized the ability to image through or in complex media. I will discuss how computational tools and machine learning allows to develop further wavefront shaping for imaging applications, and conversely discuss how the same complexity can be leveraged for optical computing tasks.

Sylvain Gigan is professor of physics at Sorbonne Université in Paris and group leader in Laboratoire Kastler-Brossel at Ecole Normale Supérieure. His research interests range from fundamental investigations of light propagation in complex media, biomedical imaging, computational imaging, and signal processing, to quantum optics and quantum information in complex media. After graduating from Ecole Polytechnique (Palaiseau France) in 2000 and a Master specialization in optics from University Paris XI (Orsay, France), he obtained a PhD in physics in 2004 from University Pierre and Marie Curie (Paris, France) in quantum and non-linear Optics. From 2004 to 2007, he was a postdoctoral researcher in Vienna University (Austria). from 2007 to 2014, he was at ESPCI ParisTech as Associate Professor, and started working on optical imaging in complex media and wavefront shaping techniques, at the Langevin Institute. Dr. Gigan is also the cofounder of a spin-off called LightOn (, aiming at performing optical computing for machine learning and big data. He was awarded the Fabry de Gramont Prize of the French Optical Society in 2016, The Joseph Fourier ATOS prize in 2018, the Jean Jerphagnon Prize in 2019. He was a member of the Institut Universitaire de France (2016-2021). He is Editor of Optics Communications.

Active metasurfaces empowered by two-dimensional materials

Isabelle Staude, Friedrich Schiller Univ. Jena (Germany)

Optical metasurfaces, two-dimensional arrangements of designed nanoresonators, offer unique opportunities for controlling light fields and for tailoring the interaction of light with nanoscale matter. Due to their flat nature, their integration with two-dimensional materials consisting of only a single molecular layer is particularly interesting. This talk reviews our recent and ongoing activities in hybridizing optical metasurfaces composed of resonant metallic or dielectric building blocks with different types of two-dimensional materials, including monolayer transition metal dichalcogenides (2D-TMDs) and carbon nanomembranes (CNMs). On the one hand, we will show that CNMs can serve as mechanically stable substrates for free-standing metasurface architectures of nanoscale thickness. On the other hand, we will demonstrate that the ability of the nanoresonators to concentrate light into nanoscale volumes can be utilized to carefully control the properties, such as pattern and polarization, of light emitted by 2D-TMDs via photoluminescence or nonlinear processes. Here, the ability of tailored nanostructures to interact selectively with exciton populations located at inequivalent conduction band minima at the corners of the 2D-TMD's Brillouin zone is of particular interest. Such a selective interaction is an important prerequisite for the realization of future miniaturized valleytronic devices.

Isabelle Staude is professor at the Institute of Solid State Physics at the Friedrich Schiller University Jena, Germany. She studied physics at the University of Konstanz, Germany, received her Ph.D. degree from the Karlsruhe Institute of Technology, Germany, in 2011, and spent several years as a postdoc at the Australian National University, Canberra, Australia. She received an Emmy-Noether Grant from the German Research Foundation and the Hertha Sponer Prize 2017 from the German Physical Society. She is a member of the German Young Academy (Junge Akademie) and a Fellow of the Max Planxk School of Photonics.