Metasurfaces Composed of Plasmonic Molecules: Hybridization Between Parallel and Orthogonal Surface Lattice Resonances
Metasurfaces Composed of Plasmonic Molecules: Hybridization Between Parallel and Orthogonal Surface Lattice Resonances
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由等离子体分子组成的超表面：平行和正交表面晶格共振之间的杂化
DOI：
10.1002/adom.201901109
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发表时间：
2019-12-09
影响因子：
9
通讯作者：
Duan, Huigao
中科院分区：
文献类型：
--
作者：
Liu, Shao-Ding;Yue, Peng;Duan, Huigao
多个表面晶格共振有效地抑制了几个光谱位置附近的辐射损失，从而增强了光-物质相互作用，使它们有希望用于多波长相关的应用，并且重要的是开发可靠的方法来产生多个晶格共振。与由各种分子组成的天然材料类似，本研究提出用等离子体人工分子构建超颖表面，与单个纳米颗粒相比，这些超颖表面代表不同的集体响应。结果表明，尖锐的多表面晶格共振激发由于等离子体三聚体分子的局域共振和阵列的瑞利异常之间的耦合，并有一个很少观察到的平行晶格共振垂直于极化的等效偶极子的形成所造成的。特别是，即使平行模式是弱的，一个明显的反交叉行为，由于杂交与正交模式发生时，共振能量彼此接近，这导致在两个杂交的本征模式，同时具有平行和正交瑞利异常的特性。考虑到非对称环境中晶格共振的激发、灵活的可调谐性以及定制集体响应的能力，用人工分子构建的超表面是设计超快和紧凑光子器件的有前途的平台。
Multiple surface lattice resonances suppress radiative losses effectively around several spectral positions, thereby enhancing the light-matter interactions and making them promising for multiwavelength related applications, and it is important to develop reliable methods to generate multiple lattice resonances. In analogy to natural materials composed of various kinds of molecules, this study proposed to construct metasurfaces with plasmonic artificial molecules, which represent distinct collective responses compared with that of single nanoparticles. It is shown that sharp multiple surface lattice resonances are excited due to the coupling between the localized resonances of plasmonic trimer molecules and the Rayleigh anomalies of the array, and there is a rarely observed parallel lattice resonance caused by the formation of equivalent dipoles perpendicular to the polarization. Particularly, even though the parallel mode is weak, a pronounced anticrossing behavior due to the hybridization with the orthogonal mode occurs when the resonance energies are approaching to each other, which results in two hybridized eigenmodes that possess both characteristics of parallel and orthogonal Rayleigh anomalies. Considering the excitation of the lattice resonances in asymmetric environments, the flexible tunability, and the ability to tailor the collective responses, metasurfaces constructed with artificial molecules are promising platforms to design ultrafast and compact photonic devices.