Thales

Societe Francaise De Detecteurs Infrarouges-sofradir

Lynred

Sofradir

Alexandru Nedelcu

Philippe Bois

Eric Costard

Alfredo De Rossi

Laurent Rubaldo

Nicolas Pere Laperne

Alexandre Kerlain

The photodetector includes a photon absorbing region formed by a first semiconductor material having a first bandgap energy value. It also includes a blocking region formed by at least second and third semiconductor materials configured to prevent the majority charge carriers from passing between the photon absorbing region and a contact region, the second semiconductor material presenting a second bandgap energy value higher than the first bandgap energy value to form a quantum well with the third semiconductor material. The blocking region is doped.

Photodetector with reduced dark current

The invention relates to a multispectral imaging device comprising a multiple-quantum-well structure operating on inter-sub-band transitions by absorbing radiation at a wavelength &#x3bb; lying within a set of wavelengths to which said structure is sensitive, said structure comprising a matrix of individual detection pixels, characterized in that the matrix is organized in subsets (E) of four individual detection pixels, a first individual detection pixel (P) comprising a first diffraction grating (R) sensitive to a first subset of wavelengths, a second individual detection pixel (P) comprising a second diffraction grating (R) sensitive to a second subset of wavelengths, a third individual detection pixel (P) comprising a third diffraction grating (R) sensitive to a third subset of wavelengths and a fourth individual detection pixel (P) 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.

Multispectral imaging device based on multiple quantum wells

The invention relates to a detector comprising a multiple quantum well structure operating on interband or intersubband transitions by absorption of radiation having a wavelength &#x3bb; having a polarization comprising a component perpendicular to the plane of the multiple quantum well structure, and comprising optical coupling means for coupling said radiation, wherein the coupling means comprise a set of first diffractive lamellar features that are distributed along at least a first direction and a set of second diffractive lamellar features that are distributed along at least a second direction, said first and second directions being mutually perpendicular and lying in a plane parallel to the plane of the multiple quantum well structure.

Electromagnetic wave detector with an optical coupling surface comprising lamellar patterns

Growing community of inventors

Bourg la Reine, France

Alexandru Nedelcu