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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 80μm) 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.

Original languageEnglish
Title of host publicationHigh Energy, Optical, and Infrared Detectors for Astronomy III
DOIs
Publication statusPublished - 2008 Dec 1
EventHigh Energy, Optical, and Infrared Detectors for Astronomy III - Marseille, France
Duration: 2008 Jun 232008 Jun 26

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7021
ISSN (Print)0277-786X

Other

OtherHigh Energy, Optical, and Infrared Detectors for Astronomy III
CountryFrance
CityMarseille
Period08/6/2308/6/26

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Park, J. H., Park, Y. S., Yoon, H. S., Lee, S., Chong, Y., Lee, Y. H., Lee, S. K., Lee, J. K., Yang, M. K., Kim, D. L., & Kim, S. W. (2008). Fabrication and photon detection experiments of Nb/Al and Ta/Al superconducting tunnel junctions. In High Energy, Optical, and Infrared Detectors for Astronomy III [70211W] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7021). https://doi.org/10.1117/12.787727