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Proceedings Paper

LWIR multi/hyperspectral detection with enhanced quantum well infrared photodetectors
Author(s): Pradip Mitra; Austin Brouns; Francine C. Case; James M. McCurdy
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Paper Abstract

This paper reports recent results from a novel approach for fabricating RI detectors from GaAs/AlGaAs multiple quantum well (MQW) materials. It involves the fabrication of quantum-well IR photodetectors (QWIPs) by patterning a 3D diffractive resonant optical cavity into the MQW structure. This approach, called the Enhanced QWIP (EQWIP), enables highly effective optical coupling into the MQW material resulting in narrow spectral response, improved detector quantum efficiency (QE), reduced dark currents, and improved photoconductive gain. EQWIP arrays operating in the 8-10 μm spectral band are reported in this paper. The peak response wavelength of the detectors, within the absorption band of the MQW material, is tuned by controlling the dimensions of the resonant structure. EQWIPs with peak spectral response at 8.6 μm exhibit peak responsivity as high as 2.6 A/W and quantum efficiency (QE) as high as 57%. Total conversion efficiency is as high as 35%. The background limited, peak detectivity measured at 9.0μm and 55 K with a 295 K background at f/2.5 is greater than or equal to 1 × 1011 cm-Hz0.5/W.

Paper Details

Date Published: 23 January 2003
PDF: 7 pages
Proc. SPIE 4820, Infrared Technology and Applications XXVIII, (23 January 2003); doi: 10.1117/12.450915
Show Author Affiliations
Pradip Mitra, Lockheed Martin Missiles and Fire Control (United States)
Austin Brouns, Lockheed Martin Missiles and Fire Control (United States)
Francine C. Case, Lockheed Martin Missiles and Fire Control (United States)
James M. McCurdy, Lockheed Martin Missiles and Fire Control (United States)

Published in SPIE Proceedings Vol. 4820:
Infrared Technology and Applications XXVIII
Bjorn F. Andresen; Gabor F. Fulop; Marija Strojnik, Editor(s)

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