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Proceedings Paper

THz photon detectors with superconducting tunnel junctions
Author(s): Sheng-Cai Shi; Jing Li; Xiao-Fang Shen; Wei Miao; Hiroshi Matsuo
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Paper Abstract

Superconducting tunnel junctions, which are also known as superconductor-insulator-superconductor (SIS) junctions, are widely used in coherent detection (heterodyne mixing) of electromagnetic radiation at millimeter and submillimeter wavelengths to achieve high spectral resolution (Δν/ν<10-6). With extremely low dark current and high quantum efficiency, superconducting tunnel junctions are also promising for THz photon detection. Besides the merit of high detection sensitivity, THz photon detectors with superconducting tunnel junctions can be operated at relatively high temperatures (above 0.3 K) and don't need rather complicated filtering systems by simply incorporating a superconducting resonant circuit with superconducting tunnel junctions. This paper mainly investigates the characteristics of THz photon detectors with Nb and NbN-based superconducting tunnel junctions. The MAR effect and associated shot noise are addressed. Some analytical and preliminary experimental results are presented.

Paper Details

Date Published: 8 February 2008
PDF: 9 pages
Proc. SPIE 6840, Terahertz Photonics, 684003 (8 February 2008); doi: 10.1117/12.760214
Show Author Affiliations
Sheng-Cai Shi, Purple Mountain Observatory, National Astronomical Observatories (China)
Jing Li, Purple Mountain Observatory, National Astronomical Observatories (China)
Graduate School of the Chinese Academy of Sciences (China)
Xiao-Fang Shen, Purple Mountain Observatory, National Astronomical Observatories (China)
Graduate School of the Chinese Academy of Sciences (China)
Wei Miao, Purple Mountain Observatory, National Astronomical Observatories (China)
Graduate School of the Chinese Academy of Sciences (China)
Hiroshi Matsuo, National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 6840:
Terahertz Photonics
Cunlin Zhang; Xi-Cheng Zhang, Editor(s)

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