Sensitivity of high temperature superconducting Josephson detectors at millimetre-wave band

J. Chen, Y. Kurigata, H. B. Wang, K. Nakajima, T. Yamashita, P. H. Wu

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

Sensitivity of high temperature superconducting (HTS) Josephson detectors at millimetre-wave band has been studied in detail. YBCO grain boundary Josephson junctions with the normal-state resistance (RN) around 1 Ω and ICRN product of less than 2 mV have been fabricated for this study, where IC is the critical current of the junction. A Gunn oscillator at the frequency of 98 GHz together with a set of calibrated attenuators with a total attenuation of 90 dB are used as a signal source. A quasi-optical system, which consists of a wideband planar log-periodic antenna encompassing the junction, parabolic mirrors and a hyperhemispherical silicon lens, has been used as an effective coupling system. Sensitivity increases with ICRN. Using a junction with ICRN of 300 μV, a sensitivity of about 9000 V W-1 has been obtained, which is higher than that of the Schottky diode detectors at the same frequency band and demonstrates that the HTS Josephson detectors are very sensitive at millimetre-wave band.

Original languageEnglish
Pages (from-to)1391-1393
Number of pages3
JournalSuperconductor Science and Technology
Volume16
Issue number12
DOIs
Publication statusPublished - 2003 Dec 1
EventISEC 2003, International Superconducting Electronics Conference - Sydney,NSW, Australia
Duration: 2003 Jul 72003 Jul 11

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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