1. Spectral-isolated photonic topological corner mode with a tunable mode area and stable frequency
- Author
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Li, Zhongfu, Li, Shiqi, Yan, Bei, Chan, Hsun-Chi, Li, Jing, Guan, Jun, Bi, Wengang, Xiang, Yuanjiang, Gao, Zhen, Zhang, Shuang, Zhan, Peng, Wang, Zhenlin, and Xie, Biye
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics ,Physics - Optics - Abstract
Emergent collective modes in lattices give birth to many intriguing physical phenomena in condensed matter physics. Among these collective modes, large-area modes typically feature small-level spacings, while a mode with stable frequency tends to be spatially tightly confined. Here, we theoretically propose and experimentally demonstrate a spectral-isolated photonic topological corner mode with a tunable mode area and stable frequency in a two-dimensional photonic crystal. This mode emerges from hybridizing the large-area homogeneous mode and in-gap topological corner modes. Remarkably, this large-area homogeneous mode possesses unique chirality and has a tunable mode area under the change of the mass term of the inner topological non-trivial lattice. We experimentally observe such topological large-area corner modes(TLCM) in a 2D photonic system and demonstrate the robustness by introducing disorders in the structure. Our findings have propelled the forefront of higher-order topology research, transitioning it from single-lattice systems to multi-lattice systems. They may support promising potential applications, particularly in vertical-cavity surface-emitting lasers., Comment: 5 pages, 4 figures
- Published
- 2024