Evaluation of a terahertz detector based on a superconducting tunnel junction coupled to a thin superconductor film

摘要

The principle of a superconducting terahertz detector 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.