Xiangtai Xi, Sen Li, Wenli Fan, Haoyang Chen, Zeyu Sun, Yue Dou, Zhengkun Fu*, Zhenglong Zhang* and Hongxing Xu,
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Tip-Enhanced Photoluminescence of a Single Quantum Dot
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.
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.
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