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Proceedings Paper

Resonator-QWIPs and FPAs
Author(s): K. K. Choi; M. D. Jhabvala; J. Sun; C. A. Jhabvala; A. Waczynski; K. Olver
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Paper Abstract

The quantum efficiency of QWIPs is difficult to predict and optimize. Recently, we have established a quantitative 3- dimensional electromagnetic model for QE computation. In this work, we used this model to design and optimize new detector structures. In one approach, we adjusted the detector volume to resonate strongly with the scattered light from the diffractive elements (DEs). The resulting intensified field increases the detector QE correspondingly. We tested this resonator-QWIP concept on four detector materials and obtained satisfactory agreements between theory and experiment. The observed single detector QE ranges from 15 to 71%, depending on the realized pixel geometry and the matching detector material. We processed one of the materials into hybridized FPAs and observed a QE of 30% with a conversion efficiency of 11%, in agreement with theory. By using rings as DEs, the FPA spectral nonuniformity can also be minimized with an observed value of 4% in comparison with the 7% for gratings. With a proven EM model, we further designed different R-QWIPs for a wide range of applications, including high conversion efficiency detection, narrow band detection through a medium, narrow band detection at a gaseous medium, simultaneous two-color detection, sequential voltage tunable two-color detection, and broadband detection at Landsat wavelengths. Experimental efforts are underway.

Paper Details

Date Published: 24 June 2014
PDF: 12 pages
Proc. SPIE 9070, Infrared Technology and Applications XL, 907037 (24 June 2014); doi: 10.1117/12.2049838
Show Author Affiliations
K. K. Choi, U.S. Army Research Lab. (United States)
M. D. Jhabvala, NASA Goddard Space Flight Ctr. (United States)
J. Sun, U.S. Army Research Lab. (United States)
C. A. Jhabvala, NASA Goddard Space Flight Ctr. (United States)
A. Waczynski, NASA Goddard Space Flight Ctr. (United States)
K. Olver, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 9070:
Infrared Technology and Applications XL
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; Paul R. Norton, Editor(s)

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