单光子探测器用超导硅化钼纳米带

L. Parlato, D. Salvoni, H. G. Ahmad, D. Massarotti, D. Montemurro, R. Ferraiuolo, L. Di Palma, R. Satariano, F. Tafuri, G. Pepe, F. Mattioli, A. Gaggero, F. Martini, Mikkel Ejrneas
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引用次数: 1

摘要

当超导材料用作单光子探测器(SPD)时,它们被制成约100 nm宽的纳米带,具有典型的弯曲结构,以增加光敏面积。此外,它们被接近临界电流的直流电流偏置以具有更高的效率。临界电流可能是不均匀的,主要是在弯道附近,产生增加的暗计数事件。在这项工作中,在6 K到7 mK的宽温度区间内实现了覆盖有极薄(2 nm) Al层的MoSi纳米带,并对其进行了表征,以研究临界电流作为温度的函数,然后研究其在尖锐角落和/或转身存在时的均匀性。最后,在不同波长(λ = 650 nm和1550 nm)的照射下,用纳米曲径仪记录计数率,并与暗态下的计数率进行比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Superconducting Molybdenum Silicide nanostrips for single photon detectors
When superconducting materials work as Single Photon Detectors (SPD) they are patterned in nanostrips about 100 nm wide with a typical meander structure to increase the photosensitive area. Moreover, they are biased by a DC current close to the critical current to have higher efficiency. The critical current could be non uniform mainly in proximity of the turn bends producing an increase of the dark count events. In this work MoSi nano-strips covered with a very thin (2 nm) layer of Al, have been realized and characterized in a wide interval of temperatures from 6 K down to 7 mK to investigate the critical current as a function of the temperature and then its uniformity in the presence of sharp corners and/or turn-arounds. Finally, the counts rates were recorded by a nano-meander under irradiation at two different wavelengths λ = 650 nm and 1550 nm, respectively, and compared with the events in the dark regime.
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