Terahertz detector based on a superconducting tunnel junction coupled to a thin superconductor film

Ariyoshi, Seiichiro; Taino, Tohru; Dobroiu, Adrian; Sato, Hiromi; Matsuo, Hiroshi; Otani, Chiko
November 2009
Applied Physics Letters;11/9/2009, Vol. 95 Issue 19, p193504
Academic Journal
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.


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