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Proceedings Paper

Development of mid-wavelength QWIP FPA
Author(s): Kazuo Ozaki; Yasuhito Uchiyama; Hironori Nishino; Yusuke Matsukura; Nobuyuki Kajihara; Toshio Fujii
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Paper Abstract

A novel quantum-well infrared photodetector (QWIP) with peak responsivity in the mid-wavelength (MW) range was characterized, and the performance of a focal-plane array (FPA) based on the MW-QWIP was investigated. InGaAs/AlGaAs quantum wells were used for the QWIP, resulting in a peak absorption wavelength in the range of 4.5~5.0 μm. The doping concentration and In composition of the well layers were varied to improve the photocurrent of the QWIP. The relationship between the noise of the QWIP and the number of multi quantum well (MQW) layers was also investigated, and the optical gain g was estimated. The noise-equivalent temperature differences (NETDs) of QWIPs with various numbers of MQW layers were calculated, and the optimum number of MQW layers was evaluated. It was found that controlling the In composition of the wells was very effective for improving the photocurrent. As a result, a MW-QWIP FPA with a NETD of 21 mK at an operation temperature of 80 K, an integration time of 16 ms, and F2.0 optics was fabricated.

Paper Details

Date Published: 31 May 2005
PDF: 11 pages
Proc. SPIE 5783, Infrared Technology and Applications XXXI, (31 May 2005); doi: 10.1117/12.603350
Show Author Affiliations
Kazuo Ozaki, Fujitsu Labs. Ltd. (Japan)
Yasuhito Uchiyama, Fujitsu Labs. Ltd. (Japan)
Hironori Nishino, Fujitsu Labs. Ltd. (Japan)
Yusuke Matsukura, Fujitsu Labs. Ltd. (Japan)
Nobuyuki Kajihara, Fujitsu Labs. Ltd. (Japan)
Toshio Fujii, Fujitsu Labs. Ltd. (Japan)


Published in SPIE Proceedings Vol. 5783:
Infrared Technology and Applications XXXI
Bjorn F. Andresen; Gabor F. Fulop, Editor(s)

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