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Proceedings Paper

Optimization of corrugated-QWIPs for large format, high-quantum efficiency, and multicolor FPAs
Author(s): Kwong-Kit Choi; Carlos Monroy; Venkataraman Swaminathan; Theodor Tamir; Ming Leung; John Devitt; David Forrai; Darrel Endres
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Paper Abstract

Previously, we demonstrated a large format 1024 x 1024 corrugated quantum well infrared photodetector focal plane array (C-QWIP FPA). The FPA has a cutoff at 8.6 μm and is BLIP at 76 K with f/1.8 optics. The pixel had a shallow trapezoidal geometry that simplified processing but limited the quantum efficiency QE. In this paper, we will present two approaches to achieve a larger QE for the C-QWIPs. The first approach increases the size of the corrugations for more active volume and adopts a nearly triangular pixel geometry for larger light reflecting surfaces. With these improvements, QE is predicted to be about 35% for a pair of inclined sidewalls, which is more than twice the previous value. The second approach is to use Fabry-Perot resonant oscillations inside the corrugated cavities to enhance the vertical electric field strength. With this approach, a larger QE of 50% can be achieved within certain spectral regions without using either very thick active layers or anti-reflection coatings. The former approach has been adopted to produce a series single color FPAs, and the experimental results will be discussed in a companion paper. In this paper, we also describe using voltage tunable detector materials to achieve multi-color capability for these FPAs.

Paper Details

Date Published: 17 May 2006
PDF: 15 pages
Proc. SPIE 6206, Infrared Technology and Applications XXXII, 62060B (17 May 2006); doi: 10.1117/12.663960
Show Author Affiliations
Kwong-Kit Choi, Army Research Lab. (United States)
Carlos Monroy, Army Research Lab. (United States)
Venkataraman Swaminathan, Army Research Lab. (United States)
Theodor Tamir, Polytechnic Univ. (United States)
Ming Leung, Polytechnic Univ. (United States)
John Devitt, L-3 Cincinnati Electronics, Inc. (United States)
David Forrai, L-3 Cincinnati Electronics, Inc. (United States)
Darrel Endres, L-3 Cincinnati Electronics, Inc. (United States)

Published in SPIE Proceedings Vol. 6206:
Infrared Technology and Applications XXXII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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