Development of superconducting tunnel junctions as an energy-dispersive detector for UV and visible photons

Chiko Otani, Yoshiyuki Takizawa, Hiromi Sato, Kazuaki Ikeda, Tokihiro Ikeda, Kazuhiko Kawai, Hiromasa Miyasaka, Takahiro Morishima, Takayuki Oku, Shigetomo Shiki, Hirohiko M. Shimizu, Hiroshi Watanabe

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We are developing an energy-dispersive detector for UV and visible photons that uses superconducting tunnel junctions (STJs) with Al trapping layers. As a first step to achieve this, we evaluated the performance of the detector for extreme ultraviolet (EUV) photons by using a synchrotron radiation facility. We achieved an energy resolution of FWHM = 17.8 ± 0.6 eV (including electrical noise of 17.6 ± 0.2 eV) for 55 eV EUV photons with a 100 × 100 μm2 STJ. The electrical noise was the main component of the energy resolution. We achieved the electrical noise of FWHM = 2.1 ± 0.1 eV for a 20 × 20 μm2 STJ by replacing the cables connecting the STJ to a preamplifier operated at room temperature. A stronger signal resulting from a thinner tunnel barrier will lead to better energy resolution for detecting UV and visible photons.

Original languageEnglish
Pages (from-to)399-402
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume372-376
Issue numberPART 1
DOIs
Publication statusPublished - 2002 Aug 1

Keywords

  • Detector
  • Photon
  • Superconducting tunnel junction
  • UV

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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