While the operation of most conventional optical devices has hitherto been based on modifying the phase, amplitude or polarization of the wavefront of light during propagation (ΔΦ=/λ ηι where λ is the wavelength of light, η l’the refractive index and ι the thickness of the medium) new components now make it possible to control the wavefront using a thick optical interface extremely thin ("flat optics"). These new components come from an assembly of nano-scale diffusers or optical resonators - all positioned at subwavelength distances to each other - in a suitable pattern. These new interfaces are similar to planar networks of artificial atoms with optical responses that do not exist in nature. At CRHEA, we study, manufacture and characterize these new interfaces with specialized electromagnetic properties, both theoretically and with a view to specific applications that aim to integrate them with large gap semiconductors. This research, which is entirely funded by a European project of the European Research Council named FLATLIGHT no. 639109, will allow us to create new ultra-thin optoelectronic components in visible wavelengths.

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Images de métasurfaces
Figure 1 : Examples of metasurfaces to develop in the project Flatlight
Recent publications

⋄ Epsilon-Near-Zero Enhancement of Nonlinear Responses from Intersubband Transitions in the Mid-Infrared

Geoffrey Barbet, Bo Qiang, Yuhao Jin, Tingting Wu, Patrice Genevet, Qijie Wang, Yu Luo
Adv. Opt. Mater., -, 2202786, (2023) - Papier régulier

⋄ Uniform Huygens metasurfaces with postfabrication phase pattern recording functionality

E Mikheeva, R Colom, P. Genevet, F Bedu, I Ozerov, S Khadir, G Baffou, R Abdeddaim, S Enoch, and J Lumeau
ACS Photonics, xxx, xxx, (2023) - Papier régulier

⋄ Crossing of the branch cut: the topological origin of a universal 2π-phase retardation in non-Hermitian metasurfaces

R Colom, E Mikheeva, K Achouri, J Zuniga-Perez, N Bonod, O JF Martin, S Burger, and P Genevet
Laser Photonics Rev., -, 2200976 , (2023) - Papier régulier