On-chip coil-integrated STJ using the persistent superconducting current for photon detectors

Katsuya Kikuchi, Tohru Taino, Masaki Nanme, Hiroshi Nakagawa, Masahiro Aoyagi, Hiroshi Sato, Hiroshi Akoh, Takeshi Iizuka, Hiroaki Myoren, Susumu Takada, Keisuke Maehata, Kenji Ishibashi, Hiromi Sato, Tokihiro Ikeda, Chiko Otani, Yoshiyuki Takizawa, Takayuki Oku, Kazuhiko Kawai, Hiromasa Miyasaka, Hirohiko M. ShimizuHiroshi Kato, Hiroshi Watanabe

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


A superconducting tunnel junction (STJ) is very attractive for use in high-energy-resolution photon detectors because of its small energy gap. To detect a single photon, the Josephson current of the STJ has had to be suppressed by an external magnetic field. We demonstrated an on-chip coil-integrated STJ photon detector, which excludes the external magnetic field, allowing a small device size. A normal-distribution function shape was adopted for the superconducting electrodes, which makes the magnetic field supplied to the STJ small. We devise a new superconducting photon detector by combining the above techniques. A new Josephson switching gate is also integrated on the same detector chip in order to drive an on-chip integrated coil by a persistent superconducting current. This behavior was confirmed experimentally using the technology of the fabrication process of the Nb/Al-AlOx/Nb Josephson tunnel junction.

Original languageEnglish
Pages (from-to)1132-1135
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 I
Publication statusPublished - Jun 2003
Event2002 Applied Superconductivity Conference - Houston, TX, United States
Duration: Aug 4 2002Aug 9 2002

All Science Journal Classification (ASJC) codes

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


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