氮含量降低后超导NbN纳米线单光子探测器热点响应谱的展宽
Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content
摘要：
利用不同成分的NbN薄膜制备的超导纳米线单光子探测器，系统地研究了超导纳米线单光子探测器的光谱探测效率和暗计数率。在4 nm厚的NbN膜中的氮含量的减少导致暗计数率的两个数量级以上的减少和热点SNSPD响应的截止波长的红移。所观察到的现象被解释的NbN膜的均匀性的改善，已被证实的电阻率的降低和测得的临界电流的比率的增加到的depairing电流。后一个因素被认为是最关键的截止波长和暗计数率的SNSPD。根据我们的研究结果，我们提出了一套标准的材料性能，以优化SNSPD在红外光谱区。
英文摘要：
The spectral detection efficiency and the dark count rate of superconducting nanowire single-photon detectors (SNSPD) has been studied systematically on detectors made from thin NbN films with different chemical compositions. Reduction of the nitrogen content in the 4 nm thick NbN films results in a more than two orders of magnitude decrease of the dark count rates and in a red shift of the cut-off wavelength of the hot-spot SNSPD response. The observed phenomena are explained by an improvement of uniformity of NbN films that has been confirmed by a decrease of resistivity and an increase of the ratio of the measured critical current to the depairing current. The latter factor is considered as the most crucial for both the cut-off wavelength and the dark count rates of SNSPD. Based on our results we propose a set of criteria for material properties to optimize SNSPD in the infrared spectral region.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
