Fabrication and photon detection experiments of Nb/Al and Ta/Al superconducting tunnel junctions

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

doi:10.1117/12.787727

22 July 2008 Fabrication and photon detection experiments of Nb/Al and Ta/Al superconducting tunnel junctions

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

Author Affiliations +

Proceedings Volume 7021, High Energy, Optical, and Infrared Detectors for Astronomy III; 70211W (2008) https://doi.org/10.1117/12.787727
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

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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, and Sug-Whan Kim "Fabrication and photon detection experiments of Nb/Al and Ta/Al superconducting tunnel junctions", Proc. SPIE 7021, High Energy, Optical, and Infrared Detectors for Astronomy III, 70211W (22 July 2008); https://doi.org/10.1117/12.787727

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