ISSTT Proceedings

ISSTT Proceedings

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Design Of Submillimeter-Wave Camera With Superconducting Direct Detectors

Authors:
Seiichirou Ariyoshi, Hiroshi Matsuo, Masanori Takeda, Takashi Noguchi
Abstract:
We have designed and are fabricating submillimeter-wave focal plane array based on superconducting direct detectors for Atacama Submillimeter Telescope Experiment (ASTE). Antenna- coupled SIS junctions with low leakage current can be used as sensitive submillimeter-wave detectors. Distributed junction array coupled to log-periodic antenna is designed to realize high quantum efficiency and wide frequency coverage. The observing center frequency using Nb/Al-AlOx/Nb junctions is about 650 GHz (450 µm). The electrical characteristics of the single SIS junction are measured. The achieved leakage current and current noise at 0.5mV- bias is 6.3 pA and 1.8 fA/[square root]Hz, respectively. This measured current noise is consistent with the calculated shot-noise limited one. The expected noise equivalent power (NEP) is an order of 10-18 W/[square root]Hz. Bandwidth of the antenna-coupled SIS junctions is calculated to be more than 60 GHz (FWHM)@650 GHz with Jc = 1 kA=cm².
Categories:
Poster Session
Year:
2001
Session:
5
Full-text:
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Page Number(s):
183-192