Patent ID: 6013912
Filing Date: 2000-01-11
Classification: H01L

Abstract:
Multispectral detector characterized in that it comprises at least one resonant cavity (2) designed to resonate at at least two wavelengths, stationary waves specific to said at least two wavelengths being set up to separate said at least two wavelengths, in that said resonant cavity contains at least two absorbent layers (12, 14) which are associated with and adapted to said at least two wavelengths respectively in order to absorb the radiation corresponding to said at least two wavelengths and which are placed on the antinodes specific to each of said stationary waves, in that said resonant cavity also contains at least two P-N junctions, the absorbent layers being placed in the space charge areas of said junctions respectively, and in that said detector also comprises at least two electrical contacts (28, 30, 36) for each cavity, in order to polarize the two P-N junctions inversely to each other to detect the corresponding radiation.