Tip-Enhanced Photoluminescence of a Single Quantum Dot

IF 3.2 3区化学 Q2 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry C Pub Date : 2025-07-22 DOI:10.1021/acs.jpcc.5c04678

Xiangtai Xi, Sen Li, Wenli Fan, Haoyang Chen, Zeyu Sun, Yue Dou, Zhengkun Fu*, Zhenglong Zhang* and Hongxing Xu,

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Abstract

Quantum dots (QDs) have attracted considerable attention due to their unique quantum confinement effects, broad-band absorption, narrow-band emission, and continuously tunable emission peaks. Given the complex and significant interdot interactions present in QD clusters, it is crucial to explore the intrinsic optical properties of individual QD in greater detail. In this study, we report the successful in situ and reversible modulation of the photoluminescence (PL) of QD. This modulation not only facilitates multiphoton emission but also enhances the fluorescence intensity of individual QDs by a factor of 10. The application of a tip-enhanced field enables PL spectral resolution as fine as 58 nm. By precisely tuning the vertical distance between the tip and the QD, we systematically investigate the correlation between tip–QD separation and fluorescence intensity. This allows for controlled regulation of PL emission and enables the observation of Rabi splitting, indicating light–matter coupling at the nanoscale.

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单量子点的尖端增强光致发光

量子点由于其独特的量子约束效应、宽带吸收、窄带发射和连续可调谐的发射峰而受到人们的广泛关注。考虑到量子点团簇中存在复杂而重要的点间相互作用，更详细地探索单个量子点的内在光学特性至关重要。在这项研究中，我们成功地原位和可逆地调制了量子点的光致发光（PL）。这种调制不仅促进了多光子发射，而且使单个量子点的荧光强度提高了10倍。尖端增强场的应用使PL光谱分辨率达到58纳米。通过精确调整尖端和量子点之间的垂直距离，我们系统地研究了尖端量子点分离与荧光强度之间的相关性。这允许控制PL发射的调节，并使Rabi分裂的观察，表明光-物质耦合在纳米尺度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

The Journal of Physical Chemistry C 化学-材料科学：综合

CiteScore

6.50

自引率

8.10%

发文量

2047

审稿时长

1.8 months

期刊介绍： The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.