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Proceedings Paper

Development of an ultrahigh-performance infrared detector platform for advanced spectroscopic sensing systems
Author(s): Manish Jain; Gary Wicks; Andrew Marshall; Adam Craig; Terry Golding; Khalid Hossain; Ken McEwan; Chris Howle
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Paper Abstract

Laser-based stand-off sensing of threat agents (e.g. explosives, toxic industrial chemicals or chemical warfare agents), by detection of distinct infrared spectral absorption signature of these materials, has made significant advances recently. This is due in part to the availability of infrared and terahertz laser sources with significantly improved power and tunability. However, there is a pressing need for a versatile, high performance infrared sensor that can complement and enhance the recent advances achieved in laser technology. This work presents new, high performance infrared detectors based on III-V barrier diodes. Unipolar barrier diodes, such as the nBn, have been very successful in the MWIR using InAs(Sb)-based materials, and in the MWIR and LWIR using type-II InAsSb/InAs superlattice-based materials. This work addresses the extension of the barrier diode architecture into the SWIR region, using GaSb-based and InAs-based materials. The program has resulted in detectors with unmatched performance in the 2-3 μm spectral range. Temperature dependent characterization has shown dark currents to be diffusion limited and equal to, or within a factor of 5, of the Rule 07 expression for Auger-limited HgCdTe detectors. Furthermore, D* values are superior to those of existing detectors in the 2-3 μm band. Of particular significance to spectroscopic sensing systems is the ability to have near-background limited performance at operation temperatures compatible with robust and reliable solid state thermoelectric coolers.

Paper Details

Date Published: 29 May 2014
PDF: 8 pages
Proc. SPIE 9073, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV, 907304 (29 May 2014); doi: 10.1117/12.2054328
Show Author Affiliations
Manish Jain, Amethyst Research Ltd. (United Kingdom)
Gary Wicks, Amethyst Research Inc. (United States)
Andrew Marshall, Lancaster Univ. (United Kingdom)
Adam Craig, Lancaster Univ. (United Kingdom)
Terry Golding, Amethyst Research Ltd. (United Kingdom)
Amethyst Research Inc. (United States )
Khalid Hossain, Amethyst Research Inc. (United States)
Ken McEwan, Defence Science and Technology Lab. (United Kingdom)
Chris Howle, Defence Science and Technology Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 9073:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV
Augustus Way Fountain III, Editor(s)

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