Modeling the Electrical and Thermal Response of Superconducting Nanowire Single-Photon Detectors
Modeling the Electrical and Thermal Response of Superconducting Nanowire Single-Photon Detectors
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DOI：
10.1109/tasc.2007.898660
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发表时间：
2007-07
影响因子：
1.8
通讯作者：
Joel K. W. Yang;A. Kerman;E. Dauler;V. Anant;K. Rosfjord;K. Berggren
中科院分区：
文献类型：
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作者：
Joel K. W. Yang;A. Kerman;E. Dauler;V. Anant;K. Rosfjord;K. Berggren
我们在光探测事件中模拟了超导纳米线单光子探测器的响应，只考虑了蓝宝石衬底上超导NbN纳米线的热学和电学性质。我们的计算表明，在形成光致电阻势垒后发生的加热是产生可测量电压脉冲的原因。我们将该数值结果与慢速器件（即大动电感）电压脉冲的实验数据进行了比较，得到了很好的拟合结果。利用该电热模型，我们估计了纳米线的温升和电阻积累，以及纳米线再次超导时的回流电流。我们还证明了通过增加串联电阻可以减少这些光电探测器的复位时间，并提供了支持性的实验数据。最后，我们提出了探测器闭锁行为的初步结果，也可以用电热模型来解释。
We modeled the response of superconducting nanowire single-photon detectors during a photodetection event, taking into consideration only the thermal and electrical properties of a superconducting NbN nanowire on a sapphire substrate. Our calculations suggest that heating which occurs after the formation of a photo-induced resistive barrier is responsible for the generation of a measurable voltage pulse. We compared this numerical result with experimental data of a voltage pulse from a slow device, i.e. large kinetic inductance, and obtained a good fit. Using this electro-thermal model, we estimated the temperature rise and the resistance buildup in the nanowire, and the return current at which the nanowire becomes superconducting again. We also show that the reset time of these photodetectors can be decreased by the addition of a series resistance and provide supporting experimental data. Finally we present preliminary results on a detector latching behavior that can also be explained using the electro-thermal model.