InAs量子点单光子源中的多时标闪烁
Multiple time scale blinking in InAs quantum dot single-photon sources
摘要：
我们使用光子相关测量研究闪烁在单一的，外延生长的自组装InAs量子点位于圆形布拉格光栅和微盘腔。归一化二阶关联函数g（2）（τ）在时间上的11个数量级上被研究，并且示出了在从几十纳秒到几十毫秒的时间尺度上闪烁的特征。将g（2）（τ）数据拟合到包括多个非辐射（暗）状态的多能级系统速率方程模型，从中获得显著小于1的辐射量子产率。即使在发射时间跟踪数据的直接直方图分析产生不确定结果的情况下也观察到这种行为。
英文摘要：
We use photon correlation measurements to study blinking in single, epitaxially-grown self-assembled InAs quantum dots situated in circular Bragg grating and microdisk cavities. The normalized second-order correlation function g(2)(τ) is studied across eleven orders of magnitude in time, and shows signatures of blinking over timescales ranging from tens of nanoseconds to tens of milliseconds. The g(2)(τ) data is fit to a multi-level system rate equation model that includes multiple non-radiating (dark) states, from which radiative quantum yields significantly less than 1 are obtained. This behavior is observed even in situations for which a direct histogramming analysis of the emission time-trace data produces inconclusive results.
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