We study the perspective of thin bilayer strips made of highly resistive (in the normal state) superconductor (S) and low resistive normal metal (N) as a detector of electromagnetic radiation. A small minigap in the quasiparticle spectra, induced in the N layer due to proximity induced superconductivity from the S layer and the ability of low resistive N layer to carry a larger superconducting current than the host dirty superconductor leads to steep temperature dependence of critical current of SN strip in wide temperature ranges. It results in higher sensitivity of current-biased SN strip to the electromagnetic radiation in comparison with S strip. We present experimental results on several microns wide MoN/Cu and MoN strips, which confirm this statement in the bolometric regime. We also discuss possible advantages of single photon counting by narrow SN strips.

中文翻译：

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电阻率大的电流偏置超导体/普通金属带的光响应

我们研究了由高电阻（正常状态）超导体（S）和低电阻正常金属（N）制成的双层薄带作为电磁辐射检测器的观点。由于来自S层的邻近感应超导性和低电阻N层承载比主体肮脏超导体更大的超导电流的能力，在N层中引起的准粒子光谱中的小间隙很小，从而导致临界电流的温度依赖性陡峭。 SN条在宽温度范围内。与S条相比，电流偏置的SN条对电磁辐射的灵敏度更高。我们目前在几微米宽的MoN / Cu和MoN试条上给出实验结果，证实了在辐射热测定法中的这一陈述。