Ultrasensitive proximity Josephson sensor with kinetic inductance readout

Francesco Giazotto, Tero Heikkilä, Giovanni Pepe, Panu Helistö, Antti Luukanen, Jukka Pekola

Research output: Contribution to journalArticleScientificpeer-review

58 Citations (Scopus)
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We propose a mesoscopic kinetic-inductance radiation detector based on a long superconductor-normal metal-superconductor Josephson junction. The operation of this proximity Josephson sensor relies on large kinetic inductance variations under irradiation due to the exponential temperature dependence of the critical current. Coupled with a dc superconducting quantum interference device readout, the PJS is able to provide a signal to noise (S/N) ratio up to ∼103 in the terahertz regime if operated as calorimeter, while electrical noise equivalent power as low as ∼7×10−20W/Hz⎯⎯⎯⎯⎯√ at 200mK can be achieved in the bolometer operation. The high performance together with the ease of fabrication make this structure attractive as an ultrasensitive cryogenic detector of terahertz electromagnetic radiation.
Original languageEnglish
Article number162507
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number16
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed


  • Josephson sensor
  • kinetic inductance
  • ultrasensitive proximity


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