Polarization sensitive photodetectors and detector arrays

G - Physics – 01 – J

Patent

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Details

G01J 4/04 (2006.01) G11B 7/13 (2006.01) G11B 11/105 (2006.01) G11B 13/04 (2006.01) H01L 27/148 (2006.01) H04N 5/335 (2006.01)

Patent

CA 2235922

A device for detecting polarization of light comprising a first photodetector tuned to absorb TE polarization, a second photodetector tuned to absorb TM polarization, and a circuit for comparing an output from the first and second photodetector for generating a polarization output. The first photodetector comprises a first reflector, an absorption layer on top of the first reflector, and a second reflector on top of the absorption layer. The second photodetector comprises a third reflector on top of an absorption layer, and a fourth reflector disposed under absorption layer.

L'invention porte sur un dispositif de détection de lumière polarisée, comportant un premier photodétecteur accordé pour absorber la polarisation TE, un deuxième photodétecteur accordé pour absorber la polarisation TM, et un circuit de comparaison des signaux des deux détecteurs, produisant un signal de polarisation. Le premier photodétecteur comprend un premier réflecteur, une couche d'absorption le recouvrant, et un deuxième réflecteur recouvrant la couche d'absorption. Le deuxième photodétecteur comprend un troisième réflecteur, recouvrant une couche d'absorption et un quatrième réflecteur placé sous la couche d'absorption.

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