Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1989-06-29
1990-12-04
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
357 4, H01J 4014
Patent
active
049755676
ABSTRACT:
A multiband photoconductive detector and method for simultaneously and separately detecting and distinguishing light or radiation from a large number of different wavelength bands is disclosed. The multiband photoconductive detector comprises a plurality of low energy gap semiconductor layers of preselected progressively decreasing thicknesses of a first material, a plurality of high energy gap semiconductor layers of a second material interleaved with the plurality of low energy gap semiconductor layers, and a plurality of pairs of electrical contacts respectively applied to the plurality of low energy gap semiconductor layers and adapted to respectively receive associated bias voltages to enable the plurality of low energy gap semiconductor layers to constitute a corresponding plurality of separate photoconductive detectors with a preselected plurality of different wavelength bands.
REFERENCES:
patent: 4620206 (1986-10-01), Ohta
patent: 4794611 (1988-12-01), Hara et al.
Publication, Quantum States of Confined Carriers in Very Thin Al.sub.x Gab.1-x As-GaAs-Al.sub.x Ga.sub.1-x As Heterostructures by R. Dingle et al., Physical Review Letters, vol. 33, No. 14, pp. 827-830, (Sep. 30, 1974).
Publication, Absorption Coefficients and Exciton Oscillator Strengths in AlGaAs-GaAs Superlattices by W. T. Masselink et al., Physical Review B., vol. 32, No. 12, pp. 8027-8034 (Dec. 15, 1985).
Publication, Limits on Band Discontinuities in GaAs-GaAlAs Heterostructures Deduced from Optical Photoresponse by D. C. Rogers et al., J. Phys. C.: Solid State Phys. 18, pp. L891-L896, (1985), Printed in Great Britain.
Bishop Stephen G.
Shanabrook Benjamin V.
Jameson George
McDonnell Thomas E.
Shami K.
The United States of America as represented by the Secretary of
Westin Edward P.
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