Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate
2006-10-31
2006-10-31
Hannaher, Constantine (Department: 2884)
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
Reexamination Certificate
active
07129489
ABSTRACT:
An infrared detector has a multi-layer structure to simultaneously detect IR energy in different spectral bands without changing polarity of a bias imposed across the detector. Two absorption layers are separated by a barrier layer that imposes an electrical potential barrier to one of the absorption layers. Under low bias in one direction, only one layer generates a photocurrent. Under a higher bias in the same direction, both layers generate a photocurrent. Additional absorption layers may be added to detect additional bands of energy, where the additional absorption layers generate photocurrent under a bias in another direction. Two, three, and four band detection is disclosed. Where absorbing layers within a single unit cell absorb under different bias direction, the barrier layer between those different bias direction layers suppresses a diffusing electron current. A method for detecting and resolving energy absorbed in two, three, and four different energy bands is also provided.
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Hannaher Constantine
Raytheon Company
Schubert William C.
Vick Karl A.
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