Ren Jiahui, Ding Wenjing, Wang Sihan, Tang Shiwei
School of Physical Science and Technology, Ningbo University, Ningbo 315211, China.
Micromachines (Basel). 2025 Jun 7;16(6):686. doi: 10.3390/mi16060686.
Topological photonics has provided revolutionary ideas for the design of next-generation photonic devices due to its unique light transmission properties. This paper proposes a honeycomb photonic crystal structure based on a mirror-symmetric interface and numerically simulates the precise manipulation of topological edge states and the robust excitation of high-order topological corner states in this structure. Specifically, two honeycomb photonic crystals with non-trivial topological properties form an interface through mirror-symmetric stitching. Continuous adjustment of the spacing between their coupling pillars can induce the closure and reopening of topological edge state energy bands, accompanied by significant band inversion, revealing the dynamic process of topological phase transitions. Furthermore, zero-dimensional high-order topological corner states are observed at the junction of boundaries with different topological properties. Their localized field strengths are strictly confined and exhibit strong robustness against structural defects. This study not only provides a new mechanism for the local symmetry manipulation of topological edge states but also lays a foundation for the design of high-order topological photonic crystals and the practical application of topological photonic devices.
拓扑光子学因其独特的光传输特性，为下一代光子器件的设计提供了革命性的思路。本文提出了一种基于镜面对称界面的蜂窝状光子晶体结构，并对该结构中拓扑边缘态的精确操控和高阶拓扑角态的稳健激发进行了数值模拟。具体而言，两个具有非平凡拓扑性质的蜂窝状光子晶体通过镜面对称拼接形成一个界面。连续调整它们耦合柱之间的间距，可以诱导拓扑边缘态能带的闭合和重新打开，同时伴随着显著的能带反转，揭示了拓扑相变的动态过程。此外，在具有不同拓扑性质的边界交汇处观察到了零维高阶拓扑角态。它们的局域场强被严格限制，并且对结构缺陷表现出很强的鲁棒性。本研究不仅为拓扑边缘态的局部对称性操控提供了一种新机制，也为高阶拓扑光子晶体的设计以及拓扑光子器件的实际应用奠定了基础。
