Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate
2007-02-20
2007-02-20
Porta, David (Department: 2884)
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
C250S370080, C250S370140, C257S021000, C257S022000, C977S759000, C977S816000, C977S954000
Reexamination Certificate
active
10996766
ABSTRACT:
A quantum-well infrared photodetector (QWIP) is presented. The photodetector includes a substrate, a buffer layer, a first conductive layer, a multiple quantum well, an optional blocking layer, and a second conductive layer. Substrate is composed of a monocrystal which may be removed after fabrication. Remaining layers are composed of group III-V nitrides, including binary, ternary, and quaternary compositions. Alternate embodiments of the present invention include a doped binary alloy along first and second conductive layers, a binary alloy along buffer and blocking layers, and alternating alloys of binary, ternary and quaternary compositions within the multiple quantum well. The present invention responds to infrared light at normal and oblique incidences, from near infrared to very far infrared.
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Gunapala et al. “Quantum Well Infrared Photodetector (QWIP) Focal Plane Arrays”, Semiconductors and Semimetals Series, vol. 62 (1999), pp. 1-10 and 47-54 [online], [retrieved on Jun. 21, 2006]. Retrieved from the Internet <URL:http://qwip.jpl.nasa.gov/rev.pdf>.
Crilly, Esq. Michael
Porta David
Rosenberger Frederick F.
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