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Proceedings Paper

Development and evaluation of a novel large-area single-pixel QWIP for infrared radiometry
Author(s): Leon J. Rogers; Evangelos Theocharous; Juntaro Ishii; Nigel P. Fox
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Paper Abstract

Infrared radiometry requires large area, linear detectors of spatially uniform response. Currently the choice of high quality detectors of mid-infrared (>8 μm) radiation is far from ideal for radiometric applications. For example, HgCdTe detectors are widely used but exhibit very large (>20%) spatial non-uniformities in their responsivity whereas thermal detectors such as pyroelectric detectors have relatively low D* values. Quantum Well Infrared Photo-detectors (QWIPs) are now well established for use in state-of-the-art cooled thermal imaging systems, driven by military application. For fundamental optical measurement applications (for example, spectral responsivity standards) the expense and complication of imaging arrays is not required. Some QWIPs are made from layers of GaAs/AlxGa1-xAs material which can be mass grown on large substrate wafers with high spatial uniformity. As such, QWIPs offer the potential to be manufactured as a large area single pixel device, with a uniform spatial response, as well as a high D* value. This paper will detail the development of a single pixel QWIP detector and present the results of an initial evaluation of this detector, carried out at NPL.

Paper Details

Date Published: 8 December 2003
PDF: 9 pages
Proc. SPIE 5209, Materials for Infrared Detectors III, (8 December 2003); doi: 10.1117/12.508787
Show Author Affiliations
Leon J. Rogers, National Physical Lab. (United Kingdom)
Evangelos Theocharous, National Physical Lab. (United Kingdom)
Juntaro Ishii, National Institute of Advanced Industrial Science and Technology (Japan)
Nigel P. Fox, National Physical Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 5209:
Materials for Infrared Detectors III
Randolph E. Longshore; Sivalingam Sivananthan, Editor(s)

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