Open AccessTowards a metasurface adapted to hyperspectral imaging applications: from subwavelength design to definition of optical properties
Author(s) -
Jules Billuart,
Sébastien Héron,
Brigitte Loiseaux,
Claude Amra,
Michel Lequime
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.432969
Subject(s) - hyperspectral imaging , optics , spectral resolution , rigorous coupled wave analysis , physics , angular resolution (graph drawing) , fourier transform , resolution (logic) , spectral imaging , focus (optics) , diffraction grating , computer science , grating , spectral line , mathematics , combinatorics , astronomy , artificial intelligence , quantum mechanics
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 TiO 2 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°).