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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.
We designed a new terahertz detector using a superconducting tunnel junction. The detector is composed of a small junction (~2 mum in diameter) coupled to a thin superconductor film with a large absorbing area (~200 mum square). The noise equivalent power (NEP) of the optimized detector is expected to be in the order of 10-18 W/radicHz.
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