Gu Min, Zhang Shangkun, Wang Xianghao, Wang Wencong, Liu Dongmei, Wu Xianqiu
Opt Express. 2024 Apr 22;32(9):15537-15545. doi: 10.1364/OE.516976.
This study proposed what we believe to be a novel method for fabricating superconducting nanowire single-photon detectors (SNSPDs) with high efficiency, polarization insensitivity, and ultrafast response. To achieve these properties in niobium nitride (NbN) SNSPDs, the periodic four-split rings (PFSR) were positioned above the nanowires. This design uses the localized surface plasmon resonance to enhance the electric field around nanowires. For an incident light with a wavelength of 1550 nm, the PFSR-SNSPD structure achieved a polarization extinction ratio of 1.0064 and absorptions of 88.94% and 88.37% under TE and TM polarizations, respectively. The nanowire length was reduced by 85% using a meandering nanowire arrangement with a fill factor of 0.074.
本研究提出了一种我们认为新颖的方法来制造具有高效率、偏振不敏感性和超快响应的超导纳米线单光子探测器（SNSPD）。为了在氮化铌（NbN）SNSPD中实现这些特性，周期性四分裂环（PFSR）被放置在纳米线之上。这种设计利用局域表面等离子体共振来增强纳米线周围的电场。对于波长为1550 nm的入射光，PFSR-SNSPD结构在TE和TM偏振下分别实现了1.0064的偏振消光比以及88.94%和88.37%的吸收率。采用填充因子为0.074的曲折纳米线排列，纳米线长度减少了85%。
