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arXiv 1909.01037physics.optics
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二维光子Su-Schrieffer-Heeger晶格的拓扑边角态

Topological edge and corner states in a two-dimensional photonic Su-Schrieffer-Heeger lattice

Minkyung Kim, Junsuk Rho

摘要:

拓扑学在光子学中的应用开辟了光子系统的新功能,如拓扑保护边界模式。利用金属纳米粒子阵列,考虑极化自由度,研究了二维Su-Schrieffer-Heeger晶格中极化相关的拓扑性质.我们证明,当本征模极化平行于平面的二维晶格,它支持孤立的纵向边缘模式和横向模式,从投影体状态隐藏。此外,在开边界条件下,通过打破四重旋转对称性,面内偏振模支持二阶拓扑相位。这项工作将在具有拓扑特征的紧凑光子系统中提供基于偏振的多功能性。

英文摘要:

Implementation of topology on photonics has opened new functionalities of photonic systems such as topologically protected boundary modes. We present polarization-dependent topological properties in 2D Su-Schrieffer-Heeger lattice by using a metallic nanoparticle array and considering the polarization degree of freedom. We demonstrate that when eigenmodes are polarized parallel to the plane of the 2D lattice, it supports isolated longitudinal edge modes and transverse modes that are hidden from the projected bulk states. Also, the in-plane polarized modes support a second-order topological phase under an open boundary condition by breaking the four-fold rotational symmetry. This work will offer polarization-based multifunctionality in compact photonic systems that have topological features.

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