Accession Number : ADD018102
Title : Infrared-to-Visible Converter.
Descriptive Note : Patent, Filed 29 Jun 94, patented 23 Apr 96,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Snow, Eric S
Report Date : Apr 1996
Pagination or Media Count : 15
Abstract : A quantum well infrared photodetector comprises multiple quantum well detectors formed within a single P-N structure forward biased by an external voltage source, for directly convening infrared radiation having a wavelength in the range of approximately 4-15 micrometers into visible radiation or near infrared radiation. Multiple quantum well detectors disposed between the P-N contact layers are comprised of alternating gallium arsenide (GaAs) quantum well layers, aluminum gallium arsenide (AlGaAs) barrier layers and alternatively, a blocking layer of aluminum arsenide (AlAs) positioned between a last aluminum gallium arsenide (AlGaAs) barrier layer and the N contact layer; and are forward-biased by the external voltage source in order to produce band gap luminescence by radiative recombination of excess carriers representative of electrons and holes in the N contact layer when the P contact layer is illuminated with optical energy of incident infrared radiation.
Descriptors : *INFRARED DETECTORS, *PHOTODETECTORS, *PATENTS, *FREQUENCY CONVERTERS, OPTICAL PROPERTIES, QUANTUM WELLS, GALLIUM ARSENIDES, ALUMINUM GALLIUM ARSENIDES, HETEROJUNCTIONS, ELECTRONS, VISIBILITY, BARRIERS, QUANTUM ELECTRONICS, ALUMINUM ARSENIDES, BLOCKING, NEAR INFRARED RADIATION
Subject Categories : Infrared Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE