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Quantum-dot excitons in nanostructured environments

机译:纳米结构环境中的量子点激子

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摘要

The interaction between light and quantum-dot (QD) excitons is strongly influenced by the environment in which the QD is placed. We have investigated the interaction by measuring the time-resolved spontaneous-emission rate of QD excitons in different nanostructured environments. Thereby, we have determined the oscillator strength, quantum efficiency and spin-flip rates of QD excitons as well as their dependencies on emission wavelength and QD size. Enhancement and inhibition of QD spontaneous emission in photonic crystal membranes (PCMs) is observed. Efficient coupling to PCM waveguides is demonstrated and the influence of disorder is discussed. The findings have a strong bearing on future nanophotonic devices.
机译:光和量子点(QD)激子之间的相互作用受到放置QD的环境的强烈影响。我们通过测量不同纳米结构环境中QD激子的时间分辨自发发射率来研究相互作用。因此,我们确定了QD激子的振荡器强度,量子效率和自旋翻转率,以及它们对发射波长和QD大小的依赖性。观察到光子晶体膜(PCM)中QD自发发射的增强和抑制。证明了到PCM波导的有效耦合,并讨论了无序的影响。这些发现对未来的纳米光子器件有重要影响。

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