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Fabrication of nanostructured superconducting single-photon detectors

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9 Author(s)
Gol'tsman, G.N. ; Dept. of Phys., Moscow State Pedagogical Univ., Russia ; Smirnov, K. ; Kouminov, P. ; Voronov, B.
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Fabrication of NbN superconducting single-photon detectors, based on the hotspot effect is presented. The hotspot formation arises in an ultrathin and submicrometer-width superconductor stripe and, together with the supercurrent redistribution, leads to the resistive detector response upon absorption of a photon. The detector has a meander structure to maximally increase its active area and reach the highest detection efficiency. Main processing steps, leading to efficient devices, sensitive in 0.4-5 μm wavelength range, are presented. The impact of various processing steps on the performance and operational parameters of our detectors is discussed.

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Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )