Terahertz and millimetre wave imaging with a broadband josephson detector working above 77 K

Jia Du*, A. D. Hellicar, S. M. Hanham, L. Li, J. C. MacFarlane, K. E. Leslie, C. P. Foley

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

A high-T c superconducting (HTS) broadband Josephson detector has been developed and applied to millimetre wave (mm-wave) and terahertz (THz) imaging. The detector is based on a YBa 2Cu 3O 7-x (YBCO) step-edge Josephson junction, which is coupled to a thin-film log-periodic antenna, designed for operation at 200-600 GHz, and a hemispheric silicon lens. The junction parameters have been optimised to achieve a high I cR n value so that the detector responds well to the specified frequencies at liquid nitrogen temperature (77 K). Images at ∼200 GHz and ∼600 GHz were acquired with the same detector; each demonstrated their unique properties. The results demonstrate the potential of achieving a cheaper, compact and portable multi-spectral imager based on a HTS detector.

Original languageEnglish
Pages (from-to)681-690
Number of pages10
JournalJournal of Infrared, Millimeter, and Terahertz Waves
Volume32
Issue number5
DOIs
Publication statusPublished - 1 May 2011

Keywords

  • Imaging
  • Josephson junction
  • Millimetre wave
  • Superconducting detector
  • Terahertz

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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