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Topological slow light and rainbow trapping of surface wave in valley photonic crystal bounded by air |
| Shuheng Chen(陈书恒)1,2, Yi Qi(齐奕)1,2, Yucen Li(李昱岑)1,2, Qihao Wang(王琪皓)1,2, and Yuanjiang Xiang(项元江)1,2,† |
1 Research Institute of Hunan University in Chongqing, Chongqing 401120, China;
2 School of Physics and Electronics, Hunan University, Changsha 410082, China |
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Abstract Topological slow light and rainbow trapping tend to rely on large-scale interface structure in previous research work, which have restricted further miniaturization. In this work, we propose a method to realize slow light and rainbow trapping at the zigzag edge of a single valley photonic crystals (VPCs) bounded by air, which is very different from previous studies where rainbow trapping is supported at the interface separating two VPCs with inversion symmetry. By constructing the VPC-air boundaries and VPC-VPC interfaces experimentally, we have observed the topologically protected rainbow trapping simultaneously at the external and internal boundary. This work provides a feasible platform for the miniaturized optical communication devices such as optical buffers, optical storage and optical routing.
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Received: 28 August 2024
Revised: 23 September 2024
Accepted manuscript online: 26 September 2024
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PACS:
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87.80.Cc
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(Optical trapping)
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03.65.Vf
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(Phases: geometric; dynamic or topological)
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42.70.Qs
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(Photonic bandgap materials)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12374302) and the Natural Science Foundation of Chongqing (Grant No. CSTB2022NSCQMSX0872). |
Corresponding Authors:
Yuanjiang Xiang
E-mail: xiangyuanjiang@126.com
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Cite this article:
Shuheng Chen(陈书恒), Yi Qi(齐奕), Yucen Li(李昱岑), Qihao Wang(王琪皓), and Yuanjiang Xiang(项元江) Topological slow light and rainbow trapping of surface wave in valley photonic crystal bounded by air 2024 Chin. Phys. B 33 118701
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