Fractal superconducting nanowire single-photon detectors with reduced polarization sensitivity

被引：40

作者：

Chi, Xiaoming ^{[1
,2
]}

Zou, Kai ^{[1
,2
]}

Gu, Chao ^{[1
,2
]}

Zichi, Julien ^{[3
]}

Cheng, Yuhao ^{[1
,2
]}

Hu, Nan ^{[1
,2
]}

Lan, Xiaojian ^{[1
,2
]}

Chen, Shufan ^{[1
,2
]}

Lin, Zuzeng ^{[1
,2
,3
]}

Zwiller, Val ^{[3
]}

Hu, Xiaolong ^{[1
,2
]}

机构：

[1] Tianjin Univ, Sch Precis Instrument & Optoelect Engn, Tianjin 300072, Peoples R China

[2] Minist Educ, Key Lab Optoelect Informat Sci & Technol, Tianjin 300072, Peoples R China

[3] Royal Inst Technol KTH, Dept Appl Phys, SE-10691 Stockholm, Sweden

来源：

OPTICS LETTERS | 2018年 / 43卷 / 20期

基金：

中国国家自然科学基金;

关键词：

Nanowires - Niobium compounds - Titanium nitride - Efficiency - Light absorption - Multimode fibers - Polarization - Particle beams - Photons - Polycrystalline materials - Avalanche photodiodes;

D O I：

10.1364/OL.43.005017

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate superconducting nanowire single-photon detectors (SNSPDs) based on a fractal design of the nanowires to reduce the polarization sensitivity of detection efficiency. We patterned niobium titanium nitride thin films into Peano curves with a linewidth of 100 nm and integrated the nanowires with optical microcavities to enhance their optical absorption. At a base temperature of 2.6 K, the fractal SNSPD exhibited a polarization-maximum device efficiency of 67% and a polarization-minimum device efficiency of 61% at a wavelength of 1550 nm. Therefore, the polarization sensitivity, defined as their ratio, was 1.1, lower than the polarization sensitivity of the SNSPDs in the meander design. The reduced polarization sensitivity of the detector could be maintained for higher-order spatial modes in multimode optical fibers and could tolerate misalignment between the optical mode and the detector. This fractal design is applicable to both amorphous and polycrystalline materials that are commonly used for making SNSPDs. (C) 2018 Optical Society of America

引用

页码：5017 / 5020

页数：4

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