Polarization-Orthogonal Nondegenerate Plasmonic Higher-Order Topological States,Physical Review Letters

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Polarization-Orthogonal Nondegenerate Plasmonic Higher-Order Topological States
Physical Review Letters ( IF 8.1 ) Pub Date : 2023-05-25 , DOI: 10.1103/physrevlett.130.213603
Yuanzhen Li _{1,

2,

3} , Su Xu ₄ , Zijian Zhang _{1,

2,

3} , Yumeng Yang _{1,

2,

3} , Xinrong Xie _{1,

2,

3} , Wenzheng Ye _{1,

2} , Feng Liu ₁ , Haoran Xue ₅ , Liqiao Jing _{1,

2,

3} , Zuojia Wang _{1,

2,

3} , Qi-Dai Chen ₄ , Hong-Bo Sun _{4,

6} , Erping Li _{1,

2} , Hongsheng Chen _{1,

2,

3,

7} , Fei Gao _{1,

2,

3}

Affiliation

Photonic topological states, providing light-manipulation approaches in robust manners, have attracted intense attention. Connecting photonic topological states with far-field degrees of freedom (d.o.f.) has given rise to fruitful phenomena. Recently emerged higher-order topological insulators (HOTIs), hosting boundary states two or more dimensions lower than those of bulk, offer new paradigms to localize or transport light topologically in extended dimensionalities. However, photonic HOTIs have not been related to d.o.f. of radiation fields yet. Here, we report the observation of polarization-orthogonal second-order topological corner states at different frequencies on a designer-plasmonic kagome metasurface in the far field. Such phenomenon stands on two mechanisms, i.e., projecting the far-field polarizations to the intrinsic parity d.o.f. of lattice modes and the parity splitting of the plasmonic corner states in spectra. We theoretically and numerically show that the parity splitting originates from the underlying interorbital coupling. Both near-field and far-field experiments verify the polarization-orthogonal nondegenerate second-order topological corner states. These results promise applications in robust optical single photon emitters and multiplexed photonic devices.

中文翻译：

偏振正交非简并等离子体高阶拓扑态

光子拓扑态以稳健的方式提供光操纵方法，引起了人们的强烈关注。将光子拓扑态与远场自由度（dof）联系起来已经产生了富有成效的现象。最近出现的高阶拓扑绝缘体（HOTI）具有比体积低两个或多个维度的边界态，为在扩展维度上拓扑局部化或传输光提供了新的范例。然而，光子 HOTI 尚未与辐射场的自由度相关。在这里，我们报告了在远场设计等离子体戈薇超表面上不同频率下对偏振正交二阶拓扑角态的观察。这种现象基于两种机制，即将远场偏振投射到晶格模式的本征宇称自由度和光谱中等离子体角态的宇称分裂。我们从理论上和数值上表明，奇偶校验分裂源于潜在的轨道间耦合。近场和远场实验均验证了偏振正交非简并二阶拓扑角态。这些结果有望在稳健的光学单光子发射器和多路复用光子器件中得到应用。

更新日期：2023-05-26

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