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Proceedings Paper

32-pixel FIRGA demonstrator: testing of a gallium arsenide photoconductor array for far-infrared astronomy
Author(s): Reinhard O. Katterloher; Lothar Barl; Gerd Jakob; Mitsuharu Konuma; Eugene E. Haller; Otto Frenzl; Lou Hermans
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Paper Abstract

A gallium arsenide photoconductive detector, which is sensitive in the far-infrared wavelength range from approximately 60 micrometers to 300 micrometers , offers the advantage of extending considerably the long wavelength cut-off of presently available photodetectors. FIRGA is an ESA sponsored GaAs detector development program which is approaching completion. The FIRGA study is intended to prepare the technology for large 2D GaAs detector arrays for far-infrared astronomy. The primary goal of the development is the preparation of a monolithic 32 element demonstrator array module with associated cryogenic read-out electronics. Continuous progress in material research has led to the production of pure and doped n-type GaAs layers using liquid phase epitaxy. We prepared sample detectors from those materials and investigated their electrical and infrared characteristics. Finally, a multi-layer structured detector device was manufactured. The 4 X 8 element array configuration is defined by sawing a split pattern into the layers with pixel size 1 mm X 1 mm. The device is back illuminated. The 32 pixels are connected to two cryogenic read-out electronics chips mounted close-by. Results of the initial detector performance tests are reported. We determined dark current, responsivity and response transients. Ongoing development activities will concentrate on material research, i.e. the production of n-GaAs layers of ultra-high purity and those with improved FIR characteristics using new centrifugal techniques for material growth.

Paper Details

Date Published: 28 July 2000
PDF: 9 pages
Proc. SPIE 4013, UV, Optical, and IR Space Telescopes and Instruments, (28 July 2000); doi: 10.1117/12.393991
Show Author Affiliations
Reinhard O. Katterloher, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Lothar Barl, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Gerd Jakob, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Mitsuharu Konuma, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Eugene E. Haller, Univ. of California/Berkeley and Lawrence Berkeley National Lab. (United States)
Otto Frenzl, ANTEC GmbH (Germany)
Lou Hermans, IMEC (Belgium)

Published in SPIE Proceedings Vol. 4013:
UV, Optical, and IR Space Telescopes and Instruments
James B. Breckinridge; Peter Jakobsen, Editor(s)

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