ISSTT Proceedings

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SIS photon detectors for submillimeter-wave observations

Authors:
Hiroshi Matsuo, Seiichirou Ariyoshi, Masanori Takeda, Takashi Noguchi
Abstract:
We propose to use superconducting direct detectors (SIS photon detectors) for future instruments for submillimeter-wave wide field imaging arrays. Using low leakage (less than 10pA) superconducting tunnel junctions, it is possible to realize submillimeter-wave direct detectors with noise equivalent power of less than 10^(-17)W/Hz^(0.5). We have evaluated leakage current and current noise of 4micron niobium SIS junctions with current density of 0.5-1kA/cm^2 at 0.3K. The measured leakage current is 5pA at 0.5mV and current noise is 1.5fA/Hz^(0.5) with white noise spectrum down to 5Hz. Antenna coupled SIS photon detector is designed as a distributed junction arrays, which is expected to gives good matching in wide frequency range in submillimeter-wave with low current density junctions.
Categories:
Detectors
Year:
2001
Session:
10
Full-text:
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Page Number(s):
476