Investigations of afterpulsing and detection efficiency recovery in superconducting nanowire single-photon detectors
Investigations of afterpulsing and detection efficiency recovery in superconducting nanowire single-photon detectors
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DOI：
10.1063/1.4807833
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发表时间：
2013-06
影响因子：
3.2
通讯作者：
V. Burenkov;He Xu;B. Qi;R. Hadfield;H. Lo
中科院分区：
文献类型：
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作者：
V. Burenkov;He Xu;B. Qi;R. Hadfield;H. Lo
我们报告的观察超导纳米线单光子探测器（SNSPD）中的非均匀暗计数率，特别是专注于后脉冲效应时，SNSPD是在高偏置电流制度。对于真实的检测事件（由输入光子触发）以及对于暗计数（没有激光输入）存在后脉冲。在我们的标准设置中，对于真实的计数和暗计数，后脉冲最有可能发生在检测事件之后的约180 ns处。我们表征的afterpulsing行为，并推测这是不是由于SNSPD本身，而是放大器用于提高电输出信号从SNSPD。我们表明，后脉冲确实消失时，我们使用不同的放大器具有更好的低频响应。我们还研究了由于暂时扰动的偏置和接地条件的SNSPD的恢复过程中的检测效率的短暂增强。
We report on the observation of a non-uniform dark count rate in Superconducting Nanowire Single Photon Detectors (SNSPDs), specifically focusing on an afterpulsing effect present when the SNSPD is operated at a high bias current regime. The afterpulsing exists for real detection events (triggered by input photons) as well as for dark counts (no laser input). In our standard set-up, the afterpulsing is most likely to occur at around 180 ns following a detection event, for both real counts and dark counts. We characterize the afterpulsing behavior and speculate that it is not due to the SNSPD itself but rather the amplifiers used to boost the electrical output signal from the SNSPD. We show that the afterpulsing indeed disappears when we use a different amplifier with a better low frequency response. We also examine the short-lived enhancement of detection efficiency during the recovery of the SNSPD due to temporary perturbation of the bias and grounding conditions.