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arXiv 0806.3194physics.opticsphysics.ins-det
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超导纳米线单光子探测器的光学特性

Optical Properties of Superconducting Nanowire Single-Photon Detectors

Vikas Anant, Andrew J. Kerman, Eric A. Dauler, Joel K. W. Yang, Kristine M. Rosfjord, Karl K. Berggren

摘要:

测量了超导纳米线单光子探测器的光吸收率。我们发现,200 nm间距,50%填充因子的设备有一个平均吸收率为21%的垂直入射前照明的1.55微米波长的光偏振平行于纳米线,只有10%的垂直偏振光。我们还测量了具有较低填充因子和较窄导线的设备,这些设备对平行偏振光的敏感度是平行偏振光的五倍。我们开发了一个数值模型,预测我们的结构的吸收率。我们还使用我们的测量,再加上设备检测效率的测量,以确定光子检测后的吸收事件的概率。我们发现,值得注意的是,吸收的平行偏振光的光子更有可能导致检测事件比平行偏振光的光子,我们提出了一个假设,定性地解释了这一结果。最后,我们还确定了由于在许多设备上的波长范围(700-1700 nm)内包含集成光学腔而导致的设备检测效率和吸收率的增强,并且发现与我们的数值模型很好地一致。

英文摘要:

We measured the optical absorptance of superconducting nanowire single photon detectors. We found that 200-nm-pitch, 50%-fill-factor devices had an average absorptance of 21% for normally-incident front-illumination of 1.55-um-wavelength light polarized parallel to the nanowires, and only 10% for perpendicularly-polarized light. We also measured devices with lower fill-factors and narrower wires that were five times more sensitive to parallel-polarized photons than perpendicular-polarized photons. We developed a numerical model that predicts the absorptance of our structures. We also used our measurements, coupled with measurements of device detection efficiencies, to determine the probability of photon detection after an absorption event. We found that, remarkably, absorbed parallel-polarized photons were more likely to result in detection events than perpendicular-polarized photons, and we present a hypothesis that qualitatively explains this result. Finally, we also determined the enhancement of device detection efficiency and absorptance due to the inclusion of an integrated optical cavity over a range of wavelengths (700-1700 nm) on a number of devices, and found good agreement with our numerical model.

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。

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