NIS tunnel junction as an x-ray photon sensor

Fatma Azgui, Carl A. Mears, Simon E. Labov, Matthias A. Frank, Bernard Sadoulet, E. Brunet, Lawrence J. Hiller, Mark A. Lindeman, Harrie Netel

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


This work presents the first results of our development of normal-insulating-superconducting tunnel junctions used as energy dispersive detectors for low energy particles. The device described here is a Ag/Al 2O 3/Al tunnel junction of area 1.5 multiplied by 10 4 micrometer squared with thicknesses of 200 nm for the normal Ag strip and 100 nm for the superconducting Al film. Two different high-speed SQUID systems manufactured by quantum magnetics and HYPRES, respectively, were used for the readout of this device. At 80 mK bath temperature we obtained an energy resolution DeltaE FWHM equals 250 eV for 5.89 keV x rays absorbed directly in the normal metal. This energy resolution appears to be limited in large part by the observed strong position dependence of the device response.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsOswald H. Siegmund, John V. Vallerga
Number of pages6
StatePublished - Dec 1 1995
EventEUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI - San Diego, CA, USA
Duration: Jul 12 1995Jul 14 1995


OtherEUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI
CitySan Diego, CA, USA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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