Dynamics of Strong Coupling between CdSe Quantum Dots and Surface Plasmon Polaritons in Subwavelength Hole Array
Dynamics of Strong Coupling between CdSe Quantum Dots and Surface Plasmon Polaritons in Subwavelength Hole Array
复制标题
亚波长孔阵列中CdSe量子点与表面等离子体激元强耦合动力学
DOI：
10.1021/acs.jpclett.6b02059
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发表时间：
2016-11-17
影响因子：
5.7
通讯作者：
Zaccaria, Remo Proietti
中科院分区：
文献类型：
--
作者：
Wang, Hai;Wang, Hai-Yu;Zaccaria, Remo Proietti
利用稳态光谱法和瞬态吸收测量方法研究了CdSe量子点激子与金纳米孔阵列表面等离子激元之间的强耦合相互作用。数值和实验稳态测量表明，SPP量子点系统确实可以进行强耦合，其特征在于拉比分裂高达220毫电子伏。特别是，它被发现，在瞬态吸收光谱中，在共振激发下，从未耦合的CdSe-QD的IS跃迁漂白带被完全分离成两个独特的漂白带，显着指纹的混合SPP-QD状态。研究还发现，这些杂化带的寿命仅略短于裸CdSe-QD的寿命，这可能是由于大的拉比分裂引起的声子瓶颈效应。这些结果可能为开发具有强SPP-QD相互作用的新型纳米等离子体器件开辟了新的途径。
We have investigated the strong coupling interaction between excitons of CdSe quantum dots (QDs) and surface plasmon polaritons (SPPs) of gold nanohole array by steady-state spectroscopic method and transient absorption measurements. Numerical and experimental steady-state measurements demonstrate that the SPP-QD system can indeed undergo strong coupling, characterized by a Rabi splitting up to 220 meV. In particular, it is found that in the transient absorption spectra, under resonant excitation, the IS transition bleaching band from uncoupled CdSe-QDs is completely separated into two distinctive bleaching bands, remarkably fingerprinting the hybrid SPP-QD state. It was also found that the lifetime of these hybrid bands is just slightly shorter than the lifetime of bare CdSe-QDs, possibly caused by the phonon bottleneck effect due to the large Rabi splitting. These results could open a new avenue toward the development of novel nanoplasmon devices with strong SPP-QD interaction.