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The principle of a terahertz detector using a superconducting tunnel junction (STJ) coupled to a large terahertz-absorbing superconductor film is verified. We have detected terahertz radiation based on the Cooper-pair breaking process, and confirmed that the sensitivity has a sharp increase around 0.7 THz, a value that is in agreement with the gap frequency of the superconducting Nb. For high-sensitivity terahertz detection, we propose an improved design of the STJ detector composed of a smaller junction coupled to a thinner superconductor film. We also discuss the expected noise equivalent power of the optimized detector.
Published in:
Applied Physics Letters
(Volume:95
,
Issue:
19
)
Date of Publication: Nov 2009
- Page(s):
- 193504 - 193504-3
- ISSN :
- 0003-6951
- Digital Object Identifier :
- 10.1063/1.3263711
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 20 November 2009
- Issue Date :
- Nov 2009
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