Exciton-Plasmon Energy Exchange Drives the Transition to a Strong Coupling Regime.
Exciton-Plasmon Energy Exchange Drives the Transition to a Strong Coupling Regime.
复制标题
激子-等离子体激元能量交换推动向强耦合机制的转变。
DOI：
10.1021/acs.nanolett.9b00827
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发表时间：
2019
期刊：
影响因子：
10.8
通讯作者：
T. Shahbazyan
中科院分区：
文献类型：
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作者：
T. Shahbazyan
我们提出了一种基于量子发射体（QE）和局域表面等离子体之间能量交换机制的激子-等离子体耦合模型。量子力学之间的等离子体相关产生了一个集体态，它与共振等离子体模式协同交换能量。通过仔细定义QE系综的等离子体模体积，我们得到了QE-等离子体耦合与以局域场表示的协同能量转移率之间的关系。对于靠近尖锐金属尖端的单个QE，我们解析地找到了相对于QE耦合到腔模式的QE-等离子激元耦合的增强因子。对于分布在包围等离子体结构的扩展区域内的量子阱，我们发现系综量子阱-等离子体激元耦合饱和到一个与系统大小和形状无关的普遍值，与实验结果一致。
We present a model for exciton-plasmon coupling based on an energy exchange mechanism between quantum emitters (QE) and localized surface plasmons in metal-dielectric structures. Plasmonic correlations between QEs give rise to a collective state exchanging its energy cooperatively with a resonant plasmon mode. By defining carefully the plasmon mode volume for a QE ensemble, we obtain a relation between QE-plasmon coupling and a cooperative energy transfer rate that is expressed in terms of local fields. For a single QE near a sharp metal tip, we find analytically the enhancement factor for QE-plasmon coupling relative to QE coupling to a cavity mode. For QEs distributed in an extended region enclosing a plasmonic structure, we find that the ensemble QE-plasmon coupling saturates to a universal value independent of system size and shape, consistent with the experiment.