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

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 f...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2002-08, Vol.372, p.399-402
Main Authors: Otani, Chiko, Takizawa, Yoshiyuki, Sato, Hiromi, Ikeda, Kazuaki, Ikeda, Tokihiro, Kawai, Kazuhiko, Miyasaka, Hiromasa, Morishima, Takahiro, Oku, Takayuki, Shiki, Shigetomo, Shimizu, Hirohiko M, Watanabe, Hiroshi
Format: Article
Language:English
Subjects:
Detector
Photon
Superconducting tunnel junction
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Summary: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 μm 2 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 μm 2 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.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(02)00709-8