Photodetector having a near field concentration

Details Photodetector having a near field concentration Photodetector having a near field concentration

2004-12-07

2009-11-24

Sohn, Seung C (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C257S021000

Reexamination Certificate

active

07622703

ABSTRACT:
The field of the invention is that of photodetectors (10), and more precisely so-called quantum well photodetectors operating in the medium infrared, known by the acronym QWIP standing for Quantum Well Infrared Photodetector.It is an object of the invention to increase the detectivity of the detectors by significantly reducing the surface area of the detection zone while conserving the incident flux. This result is obtained by arranging a structure (4) or grating on the active zone (31) of the photodetector (10), which couples the incident wave and confines it on the active zone (31).The major features of this structure (4) or this grating are that it comprises patterns or grooves having a first spatial frequency and a second spatial frequency, and also comprising a central defect.

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