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Proceedings Paper

Fabrication and photon detection experiments of Nb/Al and Ta/Al superconducting tunnel junctions
Author(s): Jang-Hyun Park; Young-Sik Park; Ho-Seop Yoon; Sungho Lee; Yonuk Chong; Yong-Ho Lee; Sang-Kil Lee; Jeon Kook Lee; Min Kyu Yang; Dong-Lak Kim; Sug-Whan Kim
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Paper Abstract

We report on fabrication and photon detection experiments of Nb/Al and Ta/Al superconducting tunnel junctions (STJs). 5-layer STJ thin-films were fabricated using UV photolithography, DC magnetron sputtering, reactive ion etching, and chemical vapor deposition techniques. STJs with 4 different sizes (20, 40, 60 and 80 μm) were deposited on sapphire substrates and tested in a two stage adiabatic demagnetization refrigerator with an operating temperature ~ 50 mK. Photons from different light sources are injected into the junctions via an optical fiber in combination with a monochromator which can produce photons from 30 nm to 550 nm with 0.1 nm resolution. The junction is read out through a charge-sensitive preamplifier followed by a shaping stage. We have measured some performance indicators and quality factors of the junctions from resultant I-V curves.

Paper Details

Date Published: 22 July 2008
PDF: 7 pages
Proc. SPIE 7021, High Energy, Optical, and Infrared Detectors for Astronomy III, 70211W (22 July 2008); doi: 10.1117/12.787727
Show Author Affiliations
Jang-Hyun Park, Korea Astronomy and Space Science Institute (South Korea)
Young-Sik Park, Korea Astronomy and Space Science Institute (South Korea)
Ho-Seop Yoon, Korea Astronomy and Space Science Institute (South Korea)
Yonsei Univ. (South Korea)
Sungho Lee, Korea Astronomy and Space Science Institute (South Korea)
Yonuk Chong, Korea Research Institute of Standards and Science (South Korea)
Yong-Ho Lee, Korea Research Institute of Standards and Science (South Korea)
Sang-Kil Lee, Korea Research Institute of Standards and Science (South Korea)
Jeon Kook Lee, Korea Institute of Science and Technology (South Korea)
Min Kyu Yang, Korea Institute of Science and Technology (South Korea)
Dong-Lak Kim, Korea Basic Science Institute (South Korea)
Sug-Whan Kim, Yonsei Univ. (South Korea)


Published in SPIE Proceedings Vol. 7021:
High Energy, Optical, and Infrared Detectors for Astronomy III
David A. Dorn; Andrew D. Holland, Editor(s)

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