具有光学结构的高温超导纳米线吸收率研究  

Simulation of absorption of high temperature superconducting nanowires with optical structure

作　　者：谢龙龙 何明[1,2,3] 李天赐 胡城皓[1] 夏丹蕾 Xie Longlong;He Ming;Li Tianci;Hu Chenghao;Xia Danlei(College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China;Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Tianjin 300350,China;Engineering Research Centre of Thin Film Photo-electronics Technology,Ministry of Education,Tianjin 300350,China)

机构地区：[1]南开大学电子信息与光学工程学院,天津300350 [2]天津市光电传感器与传感网络技术重点实验室,天津300350 [3]教育部薄膜光电子技术工程研究中心,天津300350

出　　处：《低温与超导》2021年第10期12-18,共7页Cryogenics and Superconductivity

基　　金：国家自然科学基金面上项目(61973173)资助。

摘　　要：超导纳米线单光子探测器(SNSPD)是一种用于探测单光子的超导器件,探测效率是其主要性能指标之一,主要受纳米线对光的吸收效率影响。高温超导材料具有较高的工作温度,可以显著降低探测器系统的重量、体积以及制冷成本,因此制备单光子探测器具有很大发展前景。为研究高温超导单光子探测器的光吸收率,首先用椭偏仪测量了Tl_(2)Ba_(2)CaCu_(2)O_(8)(Tl-2212)的光折射率,利用Tl-2212和YBa_(2)Cu_(3)O_(6)设计了带有光学谐振腔的SNSPD,通过优化谐振腔SiO_(2)层和CeO_(2)层的厚度,对不同线宽、厚度、占空比的纳米线光吸收率进行仿真研究,结果表明光吸收率提升了约80%,明显提升了SNSPD的系统探测效率。Superconducting nanowire single photon detector(SNSPD) is a kind of superconducting device for detecting single photon.Detection efficiency is one of its main performance indicators, which is mainly affected by the light absorption efficiency of nanometer wire.Because high temperature superconducting materials have higher working temperature, which can significantly reduce the weight, volume and cooling cost of the detector system, it is very promising to fabricate single photon detectors.In order to study the light absorption rate of high-temperature superconducting single photon detector, the photo refractive index of Tl_(2)Ba_(2)CaCu_(2)O_(8)(Tl-2212) was measured by ellipsometer. The SNSPD with optical resonator was designed by Tl-2212 and YBa_(2)Cu_(3)O_(6)(YBCO).By optimizing the thickness of SiO_(2) layer and CeO_(2) layer, the optical absorption rate of nanowires with different line widths, thicknesses and duty cycles was simulated.The results show that the light absorption rate is increased by about 80%, which significantly improves the detection efficiency of SNSPD system.

关 键 词：超导纳米线单光子探测器 Tl_(2)Ba_(2)CaCu_(2)O_(8) YBa_(2)Cu_(3)O_(6) 光学谐振腔 吸收效率 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TN20[电子电信—物理电子学]