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Abstract In valley photonic crystals, topological edge states can be gained by breaking the spatial inversion symmetry without breaking time-reversal symmetry or creating pseudo-spin structures, making highly unidirectional light transmission easy to achieve. This paper presents a novel physical model of a hexagonal-star valley photonic crystal. Simulations based on the finite element method (FEM) are performed to investigate the propagation of TM polarized mode and its application to ring resonators. The results show that such a topologically triangular ring resonator exhibits an optimum quality factor Q of about 1.25× 104, and Q has a maximum value for both frequency and the cavity length L. Our findings are expected to have significant implications for developing topological lasers and wavelength division multiplexers.
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Received: 30 June 2023
Revised: 17 August 2023
Accepted manuscript online: 28 August 2023
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PACS:
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42.70.Qs
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(Photonic bandgap materials)
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03.65.Vf
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(Phases: geometric; dynamic or topological)
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42.60.Da
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(Resonators, cavities, amplifiers, arrays, and rings)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12174307). |
Corresponding Authors:
Xinyuan Qi
E-mail: qixycn@nwu.edu.cn
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Cite this article:
Xin Wan(万鑫), Chenyang Peng(彭晨阳), Gang Li(李港), Junhao Yang(杨俊豪), and Xinyuan Qi(齐新元) Topological resonators based on hexagonal-star valley photonic crystals 2023 Chin. Phys. B 32 114208
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