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Chin. Phys. B, 2024, Vol. 33(11): 118701    DOI: 10.1088/1674-1056/ad7fd2
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

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
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.
Keywords:  topological slow light      rainbow trapping      valley photonic crystals  
Received:  28 August 2024      Revised:  23 September 2024      Accepted manuscript online:  26 September 2024
PACS:  87.80.Cc (Optical trapping)  
  03.65.Vf (Phases: geometric; dynamic or topological)  
  42.70.Qs (Photonic bandgap materials)  
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

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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