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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.
We demonstrated terahertz imaging using a two-dimensional array detector with 5times5 elements based on superconducting tunnel junctions. Real-time 25-pixel imaging at 0.65 THz was successfully performed. The array detector also allowed the shortening of the total acquisition time for larger images, made up of pixel blocks.
It is well established that the order parameter symmetry in the hole-doped high-temperature superconductors (HTS) is of d-wave type. For the electron-doped HTS one could expect to find the same order parameter symmetry because both systems have the copper oxygen planes in common. However, our experiments based on bicrystal grain boundary junctions (GBJs) show the absence of zero energy Andreev bound...
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