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:
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.