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Proceedings Paper

Design and development of high-performance radiation-hardened antireflection coatings for LWIR HgCdTe focal plane arrays
Author(s): Ashok K. Sood; E. James Egerton; Sriraj K. Bhadra; Yash R. Puri; Gregory Brill; Priyalal S. Wijewarnasuriya; Yuanping Chan; Nibir K. Dhar; Meimei Z. Tidrow; Dave Christian; Paul LoVecchio
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Paper Abstract

High Performance LWIR Focal Plane Arrays are critical for many space applications. Reliable LWIR focal plane arrays are needed for these applications that can operate in space environment without any degradation. In this paper, we present various LWIR detector array architectures currently being evaluated for LWIR applications. These include backside-illuminated configurations for HgCdTe fabricated on CdZnTe and Silicon substrates. To optimize the LWIR device performance, minimize the anti-reflection losses, and significant reduction in the effects of solarization in space, innovative Anti-reflection coatings are needed, that will enhance the performance of the LWIR detector / focal plane arrays. We also present AR Coating models and experimental results on several promising multi-layer AR coatings that includes CdTe, Si3N4 and diamond like Carbon, that have the necessary spectral response in the 8-14 microns and are hard materials with excellent bond strength. A combination of these materials offers the potential of developing anti-reflection coatings with high optical quality with controlled physical properties.

Paper Details

Date Published: 22 October 2004
PDF: 12 pages
Proc. SPIE 5564, Infrared Detector Materials and Devices, (22 October 2004); doi: 10.1117/12.565138
Show Author Affiliations
Ashok K. Sood, Magnolia Optical Technologies, Inc. (United States)
E. James Egerton, Magnolia Optical Technologies, Inc. (United States)
Sriraj K. Bhadra, Magnolia Optical Technologies, Inc. (United States)
Yash R. Puri, Magnolia Optical Technologies, Inc. (United States)
Gregory Brill, Army Research Lab. (United States)
Priyalal S. Wijewarnasuriya, Army Research Lab. (United States)
Yuanping Chan, Army Research Lab. (United States)
Nibir K. Dhar, Army Research Lab. (United States)
Meimei Z. Tidrow, Missile Defense Agency (United States)
Dave Christian, Naval Surface Warfare Ctr. (United States)
Paul LoVecchio, BAE Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 5564:
Infrared Detector Materials and Devices
Randolph E. Longshore; Sivalingam Sivananthan, Editor(s)

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