不同基片对单量子点单光子荧光发射的调控
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摘要
采用时间相关单光子计数原理搭建荧光寿命测量光学系统,实验验证了单量子点发射荧光的单光子性。针对石英玻片、硅片、金膜等不同基片上多处具有单光子荧光发射特性的单量子点,对其发射荧光的寿命进行了测量、对比,计算了不同基片上单量子点发射荧光的衰减速率、量子产率等与量子点到基片有效距离的相关性,解释了实验数据。此外,分析了石英玻片、硅片、金膜上单量子点发射荧光的闪烁行为,结果表明不同基片对单量子点单光子荧光的闪烁与衰减速率具有调控作用。
Optical system for measuring the fluorescence lifetime is built up according to the principle of time correlation single photon counting,and the characteristics of single photon emission of single quantum dots are verified experimentally.The fluorescence lifetime of quantum dots with single photon emission properties on different substrates of quartz glass slide,silicon wafer and gold film is measured and compared for different effective distances between quantum dots and substrates.The experimental results are explained with theoretical simulation results of correlation of fluorescence decay rate and quantum yield with effective distance.The blinking properties of single quantum dots on different substrates are recorded and analyzed.The experimental results show that different substrates can effectively modify the fluorescence blinking and fluorescence decay rate of single photon emission of single quantum dots.
Optical system for measuring the fluorescence lifetime is built up according to the principle of time correlation single photon counting,and the characteristics of single photon emission of single quantum dots are verified experimentally.The fluorescence lifetime of quantum dots with single photon emission properties on different substrates of quartz glass slide,silicon wafer and gold film is measured and compared for different effective distances between quantum dots and substrates.The experimental results are explained with theoretical simulation results of correlation of fluorescence decay rate and quantum yield with effective distance.The blinking properties of single quantum dots on different substrates are recorded and analyzed.The experimental results show that different substrates can effectively modify the fluorescence blinking and fluorescence decay rate of single photon emission of single quantum dots.
引文
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