Strong anapole–plasmon coupling in dielectric–metallic hybrid nanostructures,Physical Chemistry Chemical Physics

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Strong anapole–plasmon coupling in dielectric–metallic hybrid nanostructures
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2024-08-28 , DOI: 10.1039/d4cp03142c
Jingyu Wang ₁ , Suze Wu ₁ , Weimin Yang ₂ , Xiaojun Tian ₁

Affiliation

The nanoscale ampification of light–matter interactions exhibits profound potential in multiple scientific fields, such as physics, chemistry, surface science, materials science, and nanophotonics. Nonetheless, achieving robust optical mode coupling within cavities faces significant hurdles due to modal dispersion and weak optical field confinement. In this theoretical investigation, we demonstrate the viability of strong coupling between the anapole mode of a slotted silicon nanodisk and the plasmonic modes of an Ag nanodisk dimer at visible light frequencies. By introducing anapole modes, we successfully confine light to subwavelength volumes, suppressing radiative losses and achieving a remarkable Rabi splitting of 468 meV. This substantial coupling is facilitated by the large spatial overlap of intense optical fields. Capitalizing on this strong mode coupling, we generate novel hybrid energy states with significant electromagnetic field enhancement. Our study serves as a valuable blueprint for designing platforms based on strong anapole mode coupling at visible frequencies and paves the way for deeper explorations into nanoscale light–matter interactions.

中文翻译：

电介质-金属杂化纳米结构中的强变极-等离子体耦合

光与物质相互作用的纳米级放大在物理、化学、表面科学、材料科学和纳米光子学等多个科学领域展现出巨大的潜力。尽管如此，由于模色散和弱光场限制，在腔内实现鲁棒的光模耦合面临着重大障碍。在这项理论研究中，我们证明了在可见光频率下开槽硅纳米盘的阿纳极模式与银纳米盘二聚体的等离子体模式之间强耦合的可行性。通过引入折极模式，我们成功地将光限制在亚波长范围内，抑制辐射损失并实现了 468 meV 的显着拉比分裂。强光场的大空间重叠促进了这种实质性耦合。利用这种强模式耦合，我们产生了具有显着电磁场增强的新型混合能态。我们的研究为设计基于可见频率下强折返模式耦合的平台提供了宝贵的蓝图，并为更深入地探索纳米级光与物质相互作用铺平了道路。

更新日期：2024-09-02

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