Opt Lett. 2022 Nov 15;47(22):5885-5888. doi: 10.1364/OL.472397.
The intriguing discovery of higher-order topology has tremendously promoted the development of topological physics. Three-dimensional topological semimetals have emerged as an ideal platform for investigating novel topological phases. Consequently, new proposals have been theoretically revealed and experimentally realized. However, most existing schemes are implemented on the acoustic system, while similar concepts are rarely launched in photonic crystals due to the complicated optical manipulation and geometrical design. In this Letter, we propose a higher-order nodal ring semimetal protected by C symmetry originating from C symmetry. The higher-order nodal ring is predicted in three-dimensional momentum space with desired hinge arcs connected by two nodal rings. Fermi arcs and topological hinge modes generate significant marks in higher-order topological semimetals. Our work successfully proves the presence of a novel higher-order topological phase in photonic systems that we will strive to apply practically in high-performance photonic devices.
高阶拓扑的 intriguing 发现极大地促进了拓扑物理的发展。三维拓扑半金属已成为研究新型拓扑相的理想平台。因此，理论上已经揭示了新的方案，并在实验中实现了。然而，大多数现有方案都是在声学系统上实现的，而由于复杂的光学操纵和几何设计，类似的概念在光子晶体中很少出现。在这封信中，我们提出了一种由 C 对称保护的高阶节环半金属。高阶节环在三维动量空间中预测，具有所需的铰链弧连接两个节环。费米弧和拓扑铰链模式在高阶拓扑半金属中产生显著的标记。我们的工作成功地证明了在光子系统中存在一种新的高阶拓扑相，我们将努力在高性能光子器件中实际应用。
