Picosecond superconducting single-photon optical detector
Picosecond superconducting single-photon optical detector
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DOI：
10.1063/1.1388868
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发表时间：
2001-08-06
影响因子：
4
通讯作者：
Sobolewski, R
中科院分区：
文献类型：
--
作者：
Gol'tsman, GN;Okunev, O;Sobolewski, R
我们通过实验证明了一种超流动的热点形成机制，用于超快检测和对可见光和红外光子的计数。光子诱导的热点会导致超导传感器带上电阻屏障的暂时形成，并导致易于测量的电压脉冲。随后的热点愈合在类似于30 PS的时间范围内，恢复超导性（零电压状态），并且检测器准备记录另一个光子。我们的设备由一个非常狭窄的NBN带，保持在4.2 k，电流偏向接近临界电流。对于0.81 MUM波长的光子和可忽略的黑暗计数，它表现出实验测量的量子效率，相似于20％。 （c）2001美国物理研究所。
We experimentally demonstrate a supercurrent-assisted, hotspot-formation mechanism for ultrafast detection and counting of visible and infrared photons. A photon-induced hotspot leads to a temporary formation of a resistive barrier across the superconducting sensor strip and results in an easily measurable voltage pulse. Subsequent hotspot healing in similar to 30 ps time frame, restores the superconductivity (zero-voltage state), and the detector is ready to register another photon. Our device consists of an ultrathin, very narrow NbN strip, maintained at 4.2 K and current-biased close to the critical current. It exhibits an experimentally measured quantum efficiency of similar to 20% for 0.81 mum wavelength photons and negligible dark counts. (C) 2001 American Institute of Physics.