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Proceedings Paper

Sensitivity improvements of SIS photon detectors
Author(s): Hiroshi Matsuo; Sheng-Cai Shi; Takashi Noguchi; Hiromichi Akahori; Toshio Sato
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Paper Abstract

Development of two types of submillimeter-wave superconducting direct detectors are described. One is the SIS video detector and the other is the SIS photon detector. Using 500 GHz parallel connected twin junction device, video detector performance is eluted. High quantum efficiency in wide frequency range in submillimeter-wave and low noise performance is achieved. Noise equivalent power of 6 X 10-14 W/(root)Hz is measured at operating temperature of 1.5 K and bias voltage of 0.5 mV. Further improvements using distributed junction array is addressed. Large area niobium SIS junction (100 micrometer X 50 micrometer X 2) is used as a photon detection device and their thermal, electrical and optical performance is evaluated. Leakage current decrease more than three orders of magnitude at 0.5 K compared to that at 4.2 K. Noise of the device is limited by the shot noise.

Paper Details

Date Published: 31 July 1998
PDF: 8 pages
Proc. SPIE 3357, Advanced Technology MMW, Radio, and Terahertz Telescopes, (31 July 1998); doi: 10.1117/12.317392
Show Author Affiliations
Hiroshi Matsuo, Nobeyama Radio Observatory (Japan)
Sheng-Cai Shi, Nobeyama Radio Observatory (Japan)
Takashi Noguchi, Nobeyama Radio Observatory (Japan)
Hiromichi Akahori, Shinshu University (Japan)
Toshio Sato, Shinshu University (Japan)


Published in SPIE Proceedings Vol. 3357:
Advanced Technology MMW, Radio, and Terahertz Telescopes
Thomas G. Phillips, Editor(s)

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