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Resonance Coupling in Silicon Nanosphere-J-Aggregate Heterostructures

机译：硅纳米球-J-异质结构中的共振耦合

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摘要

Due to their optical magnetic and electric resonances associated with the high refractive index, dielectric silicon nanoparticles have been explored as novel nanocavities that are excellent candidates for enhancing various light matter interactions at the nanoscale. Here, from both of theoretical and experimental aspects, we explored resonance coupling between excitons and magnetic/electric resonances in heterostructures composed of the silicon nanoparticle coated with a molecular J-aggregate shell. The resonance coupling was originated from coherent energy transfer between the exciton and magnetic/electric modes, which was manifested by quenching dips on the scattering spectrum due to formation of hybrid modes. The influences of various parameters, including the molecular oscillation strength, molecular absorption line width, molecular shell thickness, refractive index of the surrounding environment, and separation between the core and shell, on the resonance coupling behaviors were scrutinized. In particular, the resonance coupling can approach the strong coupling regime by choosing appropriate molecular parameters, where an anticrossing behavior with a mode splitting of 100 meV was observed on the energy diagram. Most interestingly, the hybrid modes in such dielectric heterostructure can exhibit unidirectional light scattering behaviors, which cannot be achieved by those in plexcitonic nanoparticle composed of a metal nanoparticle core and a molecular shell.
机译：由于其与高折射率相关的光磁共振和电共振，介电硅纳米颗粒已被研究为新型纳米腔体，是增强纳米级各种光物质相互作用的极佳候选者。在这里，从理论和实验两个方面，我们都研究了激子之间的共振耦合以及异质结构中的磁/电共振，该异质结构由包覆有分子J聚集壳的硅纳米粒子组成。共振耦合源于激子与磁/电模之间的相干能量转移，其表现为由于形成了混合模而导致了散射光谱上的猝灭骤降。考察了分子振荡强度，分子吸收线宽度，分子壳厚度，周围环境的折射率以及核与壳之间的分离等各种参数对共振耦合行为的影响。特别是，共振耦合可以通过选择适当的分子参数来接近强耦合机制，其中在能量图上观察到模式交叉为100 meV的抗交叉行为。最有趣的是，这种介电异质结构中的杂化模式可以表现出单向光散射行为，这是由金属纳米颗粒核和分子壳组成的丛状纳米颗粒无法实现的。

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