Patent ID: 8378301

Claim:
Multispectral imaging device located on the surface of a substrate comprising a multiple-quantum-well structure operating on inter-sub-band transitions by absorbing radiation at a wavelength λ lying within a set of wavelengths to which said structure is sensitive, said structure comprising a matrix of individual detection pixels, wherein the matrix is organized in subsets (E ij ) of four individual detection pixels, a first individual detection pixel (P λ1 ) comprising a first diffraction grating (R λ1 ) sensitive to a first subset of wavelengths, a second individual detection pixel (P λ2 ) comprising a second diffraction grating (R λ2 ) sensitive to a second subset of wavelengths, a third individual detection pixel (P λ3 ) comprising a third diffraction grating (R λ3 ) sensitive to a third subset of wavelengths and a fourth individual detection pixel (P Δλ ) not comprising a wavelength-selective diffraction grating, the first, second and third subsets of wavelengths belonging to the set of wavelengths to which said structure is sensitive.