Plasmon-Exciton Coupling in Symmetry-Broken Nanocavities,ACS Photonics

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Plasmon-Exciton Coupling in Symmetry-Broken Nanocavities
ACS Photonics ( IF 6.5 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acsphotonics.7b00616
Rui-Qi Li _{1,

2} , F. J. García-Vidal _{1,

3} , A. I. Fernández-Domínguez ₁

Affiliation

We investigate the onset of strong coupling in the temporal dynamics of the exciton population at a single emitter interacting with symmetry-broken plasmonic nanocavities. These structures consist in pairs of metallodielectric elements separated by a nanometric gap, with different degrees of asymmetry imposed on their geometric or material characteristics. In order to describe the emergence of plasmon-exciton-polaritons in these systems, we extend and generalize a transformation optics method previously applied to dimers of identical particles. This approach provides a natural decomposition of the spectral density in terms of a well-defined set of plasmonic resonances, as well as an insightful description of the coupling strength dependence on the emitter position. On the one hand, we shed light into the low sensitivity of plasmon-exciton interactions to geometric asymmetry in cavities such as nanoparticle-on-a-mirror configurations. On the other hand, our findings reveal that a more complex spatial and spectral dependence of the strong-coupling phenomenology takes place in systems with material asymmetry, such as two-metal and metal-dielectric dimers.

中文翻译：

对称破裂纳米腔中的等离子激子耦合。

我们调查在单个发射极与对称破碎的等离激元纳米腔相互作用的激子种群的时间动态中强耦合的发生。这些结构由成对的金属电介质元件组成，这些金属电介质元件之间被纳米间隙隔开，其几何或材料特性受到不同程度的不对称。为了描述等离激元-激子-极化子在这些系统中的出现，我们扩展和推广了以前应用于相同粒子二聚体的变换光学方法。这种方法根据定义明确的等离激元共振提供了频谱密度的自然分解，以及对耦合强度对发射极位置的依赖性的有洞察力的描述。一方面，我们揭示了等离激子-激子相互作用对腔体中几何不对称性（如纳米粒子在镜上的构型）的低敏感性。另一方面，我们的发现表明，在具有材料不对称性的系统（例如双金属和金属介电二聚体）中，强耦合现象的空间和光谱依赖性更为复杂。

更新日期：2017-11-08

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