Dr. Thierry Deschamps Profile

Dr. Thierry Deschamps

at Institut des Nanotechnologies de Lyon

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Publications (3)

Proceedings Article | 28 April 2017 Presentation

High-index dielectric optical metasurface with broken vertical symmetry (Conference Presentation)

Pierre Viktorovitch, Florian Dubois, Thierry Deschamps, Hai Son Nguyen, Xavier Letartre, Jean-Louis Leclercq, Christian Seassal

Proceedings Volume 10113, 1011303 (2017) https://doi.org/10.1117/12.2255617

KEYWORDS: Dielectrics, Photonic crystals, Thin films, Reflection, Plasmonics, Dielectric polarization, Energy efficiency, Dispersion, Nanotechnology, Current controlled current source

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The seminal work of R.B. Wood (1902), who discovered anomalies in the reflection spectra of sub-wavelength metallic gratings, triggered the field of plasmonics, where ultra-thin metallic sheets laterally structured on a sub-wavelength scale, so called metallic meta-surface, are under operation. The goal of the field has extended considerably in the last decades and has aimed at arbitrary control over the amplitude, phase and polarization… of light waves at the sub-wavelength scale. All-dielectric meta-surfaces consisting in nano-structured thin films of high index dielectric material, are attracting much attention, owing to their capability to achieve the same goal as their metallic counterpart, yet with an enhanced efficiency (especially for the manipulation of strong optical resonances), being freed from significant energy dissipation as encountered in metallic nano-structures. All dielectric meta-surfaces have been around for quite a while, but were named differently (photonic crystal dielectric membranes or high index contrast gratings). Unless rare exceptions, the literature reports on structures with non-broken vertical symmetry. In the present contribution we emphasize that breaking the vertical symmetry of all-dielectric meta-surfaces provides a widely enhanced degree of freedom for the control of spatial routes and spectral characteristics of light, which depends, to an essential extent, on the local density of photonic states in the thin nano-structured dielectric film. As an enlightening illustration, we concentrate on a dielectric meta-surface formed by two super-imposed identical evanescently coupled gratings, with adjustable gap distance and lateral alignment. We show that this remarkably simple meta-surface can provide any local density of photonic states from zero (Dirac cone) to infinity (ultra-flat zero curvature dispersion characteristics), as well as any constant density over an adjustable spectral range. Exemplifying applications will illustrate the great potential of this new approach.

Proceedings Article | 29 September 2014 Paper

Absorption in photonic crystals: from order to disorder

Christian Seassal, Loїc Lalouat, He Ding, Emmanuel Drouard, Guillaume Gomard, Romain Peretti, Thierry Deschamp, Fabien Mandorlo, Régis Orobtchouk, Alain Fave

Proceedings Volume 9162, 916217 (2014) https://doi.org/10.1117/12.2063088

KEYWORDS: Absorption, Photonic crystals, Solar cells, Silicon, Thin film solar cells, Photonic nanostructures, Thin films, Surface plasmons, Silicon films, Polarization

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Proceedings Article | 25 March 2013 Paper

Nanostructured down-converter module for photovoltaic application

Thierry Deschamps, Antoine Guille, Emmanuel Drouard, Radoslaw Mazurczyk, Régis Orobtchouk, Cecile Jamois, Alain Fave, Romain Peretti, Erwann Fourmond, Antonio Pereira, Bernard Moine, Christian Seassal

Proceedings Volume 8620, 86200G (2013) https://doi.org/10.1117/12.2003640

KEYWORDS: Absorption, Photons, Silicon, Solar energy, Photonic crystals, Solar cells, Ions, Ultraviolet radiation, Nanostructuring, Photovoltaics

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