首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Room temperature measurements of the 3D orientation of single CdSe quantum dots using polarization microscopy.
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Room temperature measurements of the 3D orientation of single CdSe quantum dots using polarization microscopy.

机译:使用偏振显微镜对单个CdSe量子点的3D方向进行室温测量。

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Simple far-field emission polarization microscopy reveals that the emission transition dipole of CdSe colloidal quantum dots (QDs) is twofold degenerate at room temperature. We measure, model, and compare polarization anisotropy statistics of CdSe QDs and DiI (a one-dimensional emitter). We find excellent agreement between experiment and theory if the transition dipole of CdSe QDs is assumed to be twofold degenerate. This implies that the three-dimensional orientation of the unique crystal axis in QDs can be determined at room temperature with polarization microscopy. We describe an optical setup to measure four polarization angles of multiple single QDs simultaneously and in real time (approximately equal to 16 Hz). We use this setup in a proof-of-concept experiment to demonstrate that the rotational motion of QDs can be monitored in various host matrices.
机译:简单的远场发射极化显微镜显示,CdSe胶体量子点(QDs)的发射跃迁偶极子在室温下简并为两倍。我们测量,建模和比较CdSe QD和DiI(一维发射器)的极化各向异性统计数据。如果假设CdSe量子点的跃迁偶极子是简并的两倍,那么我们将在实验和理论之间找到极好的一致性。这意味着可以在室温下通过偏振显微镜确定量子点中唯一晶体轴的三维取向。我们描述了一种光学设置,可以同时并实时(大约等于16 Hz)测量多个单个QD的四个偏振角。我们在概念验证实验中使用此设置,以证明可以在各种宿主矩阵中监视QD的旋转运动。

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