量子点光致发光作为一种多功能探针来可视化等离子体与表面上的纳米颗粒之间的相互作用
Quantum dot photoluminescence as a versatile probe to visualize the interaction between plasma and nanoparticles on a surface
摘要：
我们的实验表明，等离子体和纳米尺寸的半导体量子点（QD）之间的相互作用是直接连接到它们的光致发光（PL）光谱的变化。这是通过采取在原位，高分辨率，和时间分辨光谱的光发射的激光激发的量子点上的电浮置样品暴露于低压氩等离子体。我们的研究结果表明，由于这些纳米结构和基板表面的直接等离子体充电的PL发射峰指示量子限制斯塔克效应的快速红移，而其他等离子体诱导的（热和离子）的影响在较长的时间尺度上可以清楚地区分这些充电效果。所提出的结果和方法开辟了新的途径，直接可视化和纳米尺度上的基本等离子体粒子相互作用的理解。
英文摘要：
We experimentally demonstrate that the interaction between plasma and nanometer-sized semiconductor quantum dots (QDs) is directly connected to a change in their photoluminescence (PL) spectrum. This is done by taking in-situ, high resolution, and temporally-resolved spectra of the light emitted by laser-excited QDs on an electrically floating sample exposed to a low pressure argon plasma. Our results show a fast redshift of the PL emission peak indicating the quantum-confined Stark effect due to direct plasma-charging of these nanostructures and the substrate surface, while other plasma-induced (thermal and ion) effects on longer time scales could clearly be distinguished from these charging effects. The presented results and method open up novel pathways to direct visualization and understanding of fundamental plasma-particle interactions on nanometer length scales.
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