扫描近场光学显微镜测量量子点团簇超辐射

发布时间：2019-06-25 14:32

【摘要】：用扫描近场光学显微镜的针尖照明模式对ZnSe量子点团簇进行精确定位测量,研究了量子点团簇的超辐射效应。在理论上根据Wannier激子超辐射模型阐述了量子点系统的超辐射发光机制;实验上用荧光光谱表征ZnSe量子点溶液的荧光性质,用扫描近场光学显微镜(SNOM)表征单个量子点团簇的超辐射光谱。结果表明,在Wannier激子超辐射模型中,量子点团簇辐射衰变率受到量子点团簇的大小和辐射光谱的共同影响,在实验上得出团簇的辐射衰变率随团簇尺寸的增加而增大,同时,不同尺寸的量子点团簇产生的辐射光谱也会对其产生影响,理论和实验的结合验证了激子超辐射的适用性。此研究结果可广泛用于生物传感器和光子器件等领域。
[Abstract]:The super-radiation effect of the cluster of the quantum dots is studied by using the tip illumination mode of the scanning near-field optical microscope to accurately position the cluster of the ZnSe quantum dots. In this paper, the super-radiation mechanism of the quantum dot system is described based on the Wannier exciton superradiation model. The fluorescence properties of the ZnSe quantum dot solution are characterized by the fluorescence spectrum. The super-radiation spectrum of a single quantum dot cluster is characterized by a scanning near-field optical microscope (SNOM). The results show that, in the Wannier exciton superradiation model, the radiation decay rate of the quantum dot cluster is affected by the size of the quantum dot cluster and the radiation spectrum, and the radiation decay rate of the cluster is increased with the increase of the cluster size, and meanwhile, The radiation spectrum of the cluster of quantum dot clusters of different sizes can also influence the radiation spectrum, and the combination of the theory and the experiment verifies the applicability of the exciton super-radiation. The results of this study can be widely used in the fields of biosensors and photonic devices.
【作者单位】：贵州大学物理学院;贵州大学贵州省光电子技术及应用重点实验室;
【基金】：国家国际科技合作专项基金资助项目(2014DFA00670) 贵州省国际科技合作基金资助项目(黔科合外G字2011[7001]) 国家自然科学基金资助项目(11204046)
【分类号】：O471.1;TH742

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