Transition to strong coupling regime in hybrid plasmonic systems: exciton-induced transparency and Fano interference
Transition to strong coupling regime in hybrid plasmonic systems: exciton-induced transparency and Fano interference
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DOI：
10.1515/nanoph-2021-0246
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发表时间：
2021-06
期刊：
影响因子：
7.5
通讯作者：
T. Shahbazyan
中科院分区：
文献类型：
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作者：
T. Shahbazyan
摘要我们提出了一个微观模型，描述了金属-电介质结构中发射极与表面等离子体共振耦合到强耦合状态的过渡。我们表明，散射光谱的形状是由两个不同的机制的相互作用。首先是近场之间的耦合的发射器和等离子体激元模式的支撑系统组件之间的能量交换，并产生激子诱导的透明度最小的散射光谱之前的过渡到一个强耦合制度。第二种机制是当系统与辐射场相互作用时等离子体激元偶极子和等离子体激元诱导的发射极偶极子之间的Fano干涉。我们表明，法诺干涉可以强烈影响散射光谱的整体形状，导致最近在实验中报道的光谱不对称性的反转。
Abstract We present a microscopic model describing the transition to a strong coupling regime for an emitter resonantly coupled to a surface plasmon in a metal–dielectric structure. We demonstrate that the shape of scattering spectra is determined by an interplay of two distinct mechanisms. First is the near-field coupling between the emitter and the plasmon mode which underpins energy exchange between the system components and gives rise to exciton-induced transparency minimum in scattering spectra prior to the transition to a strong coupling regime. The second mechanism is the Fano interference between the plasmon dipole and the plasmon-induced emitter’s dipole as the system interacts with the radiation field. We show that the Fano interference can strongly affect the overall shape of scattering spectra, leading to the inversion of spectral asymmetry that was recently reported in the experiment.