期刊
PHYSICAL REVIEW A
卷 106, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.106.013510
关键词
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资金
- Project of Zhenjiang Key Laboratory of Advanced Sensing Materials and Devices [SS2018001]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX22_3628]
- Practice and Innovation Training Project of College Students in Jiangsu University [202110299419X, 202110299423X]
In this study, a configuration beyond the 2D SSH model is proposed for investigating topological corner states in photonic crystals. The configuration features a simple structure, direct formation of photonic band gaps, and strong robustness of corner states against defects.
Recently, topological corner states have been extensively investigated in second-order topological photonic crystals (STPCs). However, most square lattice STPCs are proposed based on the two-dimensional (2D) Su-Schrieffer???Heeger (SSH) model. In this work, we propose a photonic crystal (PC) that goes beyond the 2D SSH model. The unit cell (UC) of the PC is only composed of a dielectric cylinder in an air back-ground (or an air hole in a dielectric slab). The topological trivial or nontrivial photonic band gap of the cylinder-in-air or hole-in-slab UC can be confirmed from the value of 2D polarization. Remarkably, photonic band gaps form directly without any intermediate transition. 2D bulk states, one-dimensional edge states, and zero-dimensional corner states are generated hierarchically in the box-type combination structures composed of trivial and nontrivial PCs. By comparing the perfect and defective structures, the corner states show strong robustness against the defects. The proposed configurations provide a simpler platform for exploring topolog-ical corner states in photonic systems, which have great potential for application in integrated nanophotonic devices.
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