Impact of a time gate to the purity of single photons emitted from colloidal quantum dots
Impact of a time gate to the purity of single photons emitted from colloidal quantum dots
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DOI：
10.1117/12.2507334
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
T. Ihara;S. Miki;T. Yamada;H. Terai
中科院分区：
文献类型：
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作者：
T. Ihara;S. Miki;T. Yamada;H. Terai
胶体量子点（CQD）是一种可在室温下使用的单光子源（SPS）材料。在这项工作中，我们进行了同步测量的光致发光（PL）衰减曲线和二阶光子相关，g（2），在单个CQD的研究，其单光子的纯度，这是由在时间原点的g（2）的值决定。我们证明了单光子纯度可以通过时间门控g（2）分析来提高，其中通过对PL衰减曲线应用时间滤波器来排除PL信号的一部分。我们表明，通过使用超导纳米线单光子探测器，可以观察到高纯度的单光子，表现出g（2）的时间原点范围从0.01到0.02。
Colloidal quantum dots (CQDs) are attractive material for single-photon sources (SPSs) that can be utilized at room temperature. In this work, we performed simultaneous measurements of photoluminescence (PL) decay curve and second-order photon correlation, g(2), on single CQDs to study the purity of their single photons, which is determined by the value of g(2)at the time origin. We demonstrate that the single-photon purity can be improved through time-gated g(2) analysis, where a part of the PL signal is excluded by applying a temporal filter to the PL decay curve. We show that by using a superconducting nanowire single-photon detector, it is possible to observe highly-purified single photons that exhibited g(2) at the time origin ranging from 0.01 to 0.02.