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Proceedings Paper

Multispectral imaging with type II superlattice detectors
Author(s): Gamini Ariyawansa; Joshua M. Duran; Matt Grupen; John E. Scheihing; Thomas R. Nelson; Michael T. Eismann
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Paper Abstract

Infrared (IR) focal plane arrays (FPAs) with multispectral detector elements promise significant advantages for airborne threat warning, surveillance, and targeting applications. At present, the use of type II superlattice (T2SL) structures based on the 6.1Å-family materials (InAs, GaSb, and AlSb) has become an area of interest for developing IR detectors and their FPAs. The ability to vary the bandgap in the IR range, suppression of Auger processes, prospective reduction of Shockley-Read-Hall centers by improved material growth capabilities, and the material stability are a few reasons for the predicted dominance of the T2SL technology over presently leading HgCdTe and quantum well technologies. The focus of the work reported here is on the development of T2SL based dual-band IR detectors and their applicability for multispectral imaging. A new NpBPN detector designed for the detection of IR in the 3-5 and 8-12 μm atmospheric windows is presented; comparing its advantages over other T2SL based approaches. One of the key challenges of the T2SL dual-band detectors is the spectral crosstalk associated with the LWIR band. The properties of the state-of-the-art T2SLs (i.e., absorption coefficient, minority carrier lifetime and mobility, etc.) and the present growth limitations that impact spectral crosstalk are discussed.

Paper Details

Date Published: 31 May 2012
PDF: 14 pages
Proc. SPIE 8353, Infrared Technology and Applications XXXVIII, 83530E (31 May 2012); doi: 10.1117/12.917300
Show Author Affiliations
Gamini Ariyawansa, Air Force Research Lab. (United States)
Joshua M. Duran, Air Force Research Lab. (United States)
Matt Grupen, Air Force Research Lab. (United States)
John E. Scheihing, Air Force Research Lab. (United States)
Thomas R. Nelson, Air Force Research Lab. (United States)
Michael T. Eismann, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 8353:
Infrared Technology and Applications XXXVIII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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