Computer Science – Performance
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4028..300c&link_type=abstract
Proc. SPIE Vol. 4028, p. 300-310, Infrared Detectors and Focal Plane Arrays VI, Eustace L. Dereniak; Robert E. Sampson; Eds.
Computer Science
Performance
Scientific paper
In this paper, we discuss the utilities of corrugated quantum well infrared photodetectors (C-QWIPs) in detector material characterization. By measuring the detector responsivity as a function of corrugation period, several important detector parameters, such as the absorption coefficient (alpha) of parallel propagating light and the energy resolved photoconductive gain g, can be directly deduced. For the QWIP material presented, (alpha) at the peak was found to be 0.21 micrometer-1 under the usual operating condition. This value of (alpha) corresponds to an absorption length of 4.9 micrometer. Instead of being a constant, the value of g also varies significantly across the excitation spectrum, and the peak value is larger than the noise gain at large bias. Our results show that the present characterization technique is capable of providing accurate and detailed information on the intrinsic properties of QWIP materials under actual operating conditions. It is extremely useful in detector optimization. In addition, we also show that the performance of C-QWIPs can be further improved by etching an additional vertical trench at the center of each corrugation.
Chen ChenJune
Choi Kwong-Kit
Tsui Daniel C.
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