Towards a metasurface adapted to hyperspectral imaging applications: from subwavelength design to definition of optical properties

Jules Billuart (1, 2) , Sébastien Héron (2) , Brigitte Loiseaux (3) , Claude Amra (1) , Michel Lequime (1)

1 CONCEPT - CONCEPT
2 Thales Research and Technology - Thales Research and Technology
3 THALES Research & Technology

We numerically demonstrate the capability of a single metasurface to simultaneously separate and focus spectral features in accordance with the specifications of a pushbroom hyperspectral imager. This is achieved through the dispersion engineering of a library of two-level TiO2 nano-elements. Sommerfeld integrals are used to confirm our numerical simulations provided by our solver based on Fourier modal method. As a proof of concept, a metasurface with a 175 μm diameter is designed to be compatible with hyperspectral imaging over a spectral range of ±50 nm around 650 nm with a spectral resolution of 8.5 nm and a field of view of 8° around the normal incidence (angular resolution of 0.2°).

Domaines: Optique / photonique; Electromagnétisme; Optique [physics.optics]

Jules Billuart, Sébastien Héron, Brigitte Loiseaux, Claude Amra, Michel Lequime. Towards a metasurface adapted to hyperspectral imaging applications: from subwavelength design to definition of optical properties. Optics Express, 2021, 29 (21), pp.32764. ⟨10.1364/OE.432969⟩. ⟨hal-03454629⟩