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 language | English |
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Pages (from-to) | 681-690 |
Number of pages | 10 |
Journal | Journal of Infrared, Millimeter, and Terahertz Waves |
Volume | 32 |
Issue number | 5 |
DOIs | |
Publication status | Published - 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