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Proceedings Paper

Bias selective operation of Sb-based two-color photodetectors
Author(s): M. N. Abedin; T. F. Refaat; I. B. Bhat; Y. Xiao; D. G. Johnson
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Paper Abstract

Multicolor detectors have a strong potential to replace conventional single-color detectors in application dealing with the simultaneous detection of more than one wavelength. This will lead to the reduction of heavy and complex optical components now required for spectral discrimination for multi-wavelengths applications. This multicolor technology is simpler, lighter, compact and cheaper with respect to the single-color ones. In this paper, Sb-based two-color detectors fabrication and characterization are presented. The color separation is achieved by fabricating dual band pn junction on a GaSb substrate. The first band consists of an InGaAsSb pn junction for long wavelength detection, while the second band consists of a GaSb pn junction for shorter wavelength detection. Three metal contacts were deposited to access the individual junctions. Surface morphology of multi-layer thin films and also device characteristics of quasi-dual band photodetector were characterized using standard optical microscope and electro-optic techniques respectively. Dark current measurements illustrated the diode behavior of both lattice-matched detector bands. Spectral response measurements indicated either independent operation of both detectors simultaneously, or selective operation of one detector, by the polarity of the bias voltage, while serially accessing both devices.

Paper Details

Date Published: 7 September 2006
PDF: 9 pages
Proc. SPIE 6297, Infrared Spaceborne Remote Sensing XIV, 629709 (7 September 2006); doi: 10.1117/12.680969
Show Author Affiliations
M. N. Abedin, NASA Langley Research Ctr. (United States)
T. F. Refaat, Old Dominion Univ. (United States)
I. B. Bhat, Rensselaer Polytechnic Institute (United States)
Y. Xiao, Rensselaer Polytechnic Institute (United States)
D. G. Johnson, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 6297:
Infrared Spaceborne Remote Sensing XIV
Marija Strojnik, Editor(s)

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