Photoresponse of current-biased superconductor/normal metal strip with large ratio of resistivities

摘要： Detection of electromagnetic radiation by superconductor is based on destruction of superconductivity by photons and corresponding change of resistance of superconducting sample. For example in the superconducting bolometer or transition edge sensor (TES) the superconductor is biased near the resistive transition, at temperature below the critical temperature Tc of superconductor [1, 2]. The absorbed photons heat up electrons in the detector, electron temperature increases and it leads to the increase of the temperature dependent resistance of superconductor R(T ). In such a detector the sharper the dependence R(T ) the higher sensitivity the superconducting detector has.