摘要:
According to one aspect, the invention relates to a microbolometer array for thermal detection of light radiation in a given spectral band, comprising a supporting substrate and an array of microbolometers (300) of given dimensions, arranged in an array. Each of said microbolometers comprises a membrane (301) suspended above said supporting substrate, said membrane consisting of an element (305) for absorbing the incident radiation and a thermometric element (304) in thermal contact with the absorber, electrically insulated from said absorber element. The absorber element comprises at least one first metal/insulator/metal (MIM) structure comprising a multilayer of three superposed films of submicron-order thickness i.e. a first metallic film (311), a dielectric film (310), and a second metallic film (309), said MIM structure being able to have a resonant absorption of said incident radiation at at least one wavelength in said spectral band. The area of the microbolometer pixel covered by said membrane (301) is less than or equal to half of the total area of the microbolometer pixel.
摘要:
According to one aspect, the invention relates a spectral band-pass filter, which is optimized for the transmission of an incident wave at at least a first given central wavelength λ 0 , and which includes: a metal grating having a thickness (t) greater than approximately λ 0 /50 and including at least a first set of substantially identical, parallel slots having a width ( W ) less than around λ 0 /10, and being spaced apart periodically or quasi-periodically according to a first period that is less than said first central wavelength, a layer of dielectric material having a thickness (h) and a given refractive index (n g ), which is coupled to the metal grating to form a waveguide for the waves diffracted by the grating, said first period of the grating being designed such that only orders 0 and ± 1 of a wave having normal incidence and a wavelength λ 0 are diffracted in the layer of dielectric material, the assembly of the dielectric layer and grating being suspended, during use, in a fluid having a refractive index of close to 1.
摘要:
Un photodétecteur (10) comprend un résonateur de Helmholtz et une structure photosensible (4) qui est disposée dans un intervalle de concentration de champ électrique faisant partie du résonateur de Helmholtz. Un tel photodétecteur est adapté notamment pour des applications d'imagerie. La longueur d'onde du rayonnement à détecter est déterminée par des dimensions du résonateur de Helmholtz, à l'intérieur d'un intervalle spectral de détection de la structure photosensible.
摘要:
Un élément (10) de conversion spectrale pour rayonnement électromagnétique comporte des antennes Térahertz (2) et des antennes infrarouges (3) qui sont réparties dans des zones de pixels (ZP). Les antennes Térahertz et les antennes infrarouges qui sont dans une même zone de pixel sont couplées thermiquement, et celles qui sont dans des zones de pixels différentes sont découplées. Un tel élément permet de saisir des images qui sont formées avec du rayonnement Térahertz, en utilisant un détecteur d'image (20) infrarouge.
摘要:
According to one aspect, the invention relates to an element for quantum photodetection of an incident radiation in a spectral band centred around a central wavelength λ 0 , having a front surface intended for receiving said radiation, and including: a stack of layers of semiconductor material forming a PN or PIN junction and including at least one layer made of an absorbent semiconductor material having a cut-off wavelength λ c > λ 0 , the stack of layers of semiconductor material forming a resonant optical cavity; and a structure for coupling the incident radiation with the optical cavity such as to form a resonance at the central wavelength λ 0 allowing the absorption of more than 80 % in the layer of absorbent semiconductor material at said central wavelength, and an absence of resonance at the radiative wavelength λ rad , wherein the radiative wavelength λ rad is the wavelength for which, at operating temperature, the radiative recombination rate is the highest.