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Proceedings Paper

Development of a far-infrared Ge:Ga monolithic array for a possible application to SPICA
Author(s): Mai Shirahata; Shuhei Kamiya; Shuji Matsuura; Mitsunobu Kawada; Yoshihiro Sawayama; Yasuo Doi; Takao Nakagawa; Takehiko Wada; Hidehiro Kawada; Ybe Creten; Burak Okcan; Walfried Raab; Albrecht Poglitsch
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Paper Abstract

We present the current status of the development of a far-infrared monolithic Ge:Ga photoconductor array proposed for the SAFARI instrument onboard SPICA, which is a future infrared space mission. SPICA has a large (3-m class) cooled (<6 K) telescope, which enables us to make astronomical observations with high spatial resolution and unprecedented sensitivity in the mid- and far-infrared wavelength. As a candidate detector to cover the 45-110 μm band of a far-infrared focal plan instrument of SAFARI, we are developing a large format monolithic Ge:Ga array. The monolithic Ge:Ga array is directly connected to cryogenic readout electronics (CRE) using the Au-Indium bumping technology. Our goal is to develop a 64×64 Ge:Ga array, on the basis of existing technologies and experience in making the 3×20 Ge:Ga monolithic arrays for the AKARI satellite. In order to realize a larger format array with better sensitivity than that of the AKARI array, we have been making some technical improvements; (1) development of the Au-In bumping technology to realize the large format array, (2) optimization of the structure of the transparent electrode to achieve the better sensitivity, (3) development of an anti-reflection coating to reduce interference fringe between the Ge substrate, and (4) Use of the low-noise cryogenic readout electronics with low power consumption. We fabricated the prototype 5×5 Ge:Ga arrays to demonstrate and evaluate the properties of monolithic array. We demonstrate experimentally the feasibility of these elemental technologies, and also show the results of performance measurements for the prototype Ge:Ga arrays.

Paper Details

Date Published: 15 July 2010
PDF: 12 pages
Proc. SPIE 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, 77410B (15 July 2010); doi: 10.1117/12.857772
Show Author Affiliations
Mai Shirahata, Japan Aerospace Exploration Agency (Japan)
Shuhei Kamiya, Japan Aerospace Exploration Agency (Japan)
The Univ. of Tokyo (Japan)
Shuji Matsuura, Japan Aerospace Exploration Agency (Japan)
Mitsunobu Kawada, Japan Aerospace Explolation Agency (Japan)
Nagoya Univ. (Japan)
Yoshihiro Sawayama, The Univ. of Tokyo (Japan)
Yasuo Doi, The Univ. of Tokyo (Japan)
Takao Nakagawa, Japan Aerospace Exploration Agency (Japan)
Takehiko Wada, Japan Aerospace Exploration Agency (Japan)
Hidehiro Kawada, Nagoya Univ. (Japan)
Ybe Creten, IMEC (Belgium)
Burak Okcan, IMEC (Belgium)
Walfried Raab, Max-Planck-Institut für extraterrestrische Physik (Germany)
Albrecht Poglitsch, Max-Planck-Institut für extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 7741:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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