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Symmetry Perturbation in Photonic Nanostructures, Controlling Light Emission and Photocatalysis

Christian Seassal, Senior Researcher, French CNRS

Presented on Zoom

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Abstract

Combining active optical materials like III-V semiconductors, inorganic functional oxides or halide perovskites with surface-addressable photonic crystals and metasurfaces is a key approach to generate novel photonic media with extended functionalities. The properties of these active structures can benefit from the fine control of the dispersion characteristics which can be achieved by introducing controlled asymmetries in periodic dielectric patterns. The potentialities offered by this degree of freedom include extensive control of spectral, spatial but also angular properties of emitted or absorbed light. It also enables to generate optical modes with a low level of optical losses or high bandwidth ultra-compact reflectors. During this webinar, basic concepts and key processes developed in this area will be presented. This talk will be illustrated by results on low-threshold lasing, beam steering and polarization control. Such photonic structures could also be used for photovoltaics, but also photocatalysis control for depollution or solar fuel cells. Some examples will be shown during this talk.

Biography

Christian Seassal is Senior Researcher at the French CNRS. He graduated from INSA de Lyon (1993) and received his PhD from Ecole Centrale de Lyon in 1997. He is the head of the i-Lum team, including 25 CNRS scientists and academics working on light engineering and conversion. His research activities concern photonic nanostructures and their applications for integrated photonic and solar energy harvesting. He has authored and co-authored about 145 research papers in international journals, and of over 70 invited conferences. He has been deputy editor of the OSA Optics Express Journal, and editor of its supplement Energy Express. He received the French CNRS bronze medal in 2002.