论文标题
从厚锥形纳米线中的量子点对蓝绿色单光子发射的定量分析
Quantitative analysis of the blue-green single-photon emission from a quantum dot in a thick tapered nanowire
论文作者
论文摘要
在蓝绿色范围内充当单个光子发射器的量子点在低温温度下被制造并表征。它们由插入（Zn，mg）Se纳米线中的CDSE点组成。在非谐波连续波和脉冲激发下测量了光致发光光谱，衰减曲线和自相关功能。分析方法同时应用于衰减曲线和相关函数。它允许定量描述这两个量如何受到Biexciton喂养，明亮的激子衰变，深色激子的效果以及两种激光脉冲之间的重新启动的影响。记录了我们的分辨率极限（200美元$ $ eV）的线宽。报道的相关性计数从陷阱的重新兴趣完全控制到移动载体或其他QD的重新启动的较小贡献，低至5％。
Quantum dots acting as single photon emitters in the blue-green range are fabricated and characterized at cryogenic temperature. They consist in CdSe dots inserted in (Zn,Mg)Se nanowires with a thick shell. Photoluminescence spectra, decay curves and autocorrelation functions were measured under nonresonant continuous-wave and pulsed excitation. An analytical approach is applied simultaneously to the decay curves and correlation functions. It allows a quantitative description of how these two quantities are affected by the exciton rise due to biexciton feeding, the bright exciton decay, the effect of the dark exciton, and the re-excitation between two laser pulses. Linewidths at our limit of resolution (200 $μ$eV) are recorded. The reported correlation counts vary from a full control by re-excitation from traps, to a small contribution of re-excitation by mobile carriers or other QDs, as low as 5%.
