Multifrequency and Multimode Topological Waveguides in a Stampfli-Triangle Photonic Crystal with Large Valley Chern Numbers

Yan，Bei1,2; Peng，Yiwei1,3; Xie，Jianlan1; Peng，Yuchen1; Shi，Aoqian1; Li，Hang1; Gao，Feng1; Peng，Peng1; Jiang，Jiapei1; Liu，Jianjun1; Gao，Fei3; Wen，Shuangchun1

2024

10.1002/lpor.202300686

Laser and Photonics Reviews   影响因子和分区

1863-8880

1863-8899

The multifrequency quantum valley Hall effect (QVHE) has been realized to significantly improve the transmission capacity of topological waveguides, and the multimode QVHE with a large valley Chern number has been realized to increase the mode density of topological waveguides. However, multifrequency and multimode QVHEs have not been realized simultaneously. In this work, using tight-binding model calculations and numerical simulations, a valley photonic crystal (VPC) consisting of a Stampfli-triangle photonic crystal is constructed, and its multiple degeneracies in the low-frequency and high-frequency bands split simultaneously to realize the QVHE with multiple topological edge states (TESs). The multifrequency and multimode topological transmission with two low-frequency modes and four high-frequency modes is realized by means of simulations and experiments through a Z-shaped waveguide constructed using two VPCs with opposite valley Chern numbers to prove the realization of a large valley Chern number in the two frequency bands. The two low-frequency modes are successfully distinguished with position-dependent selective excitations, which experimentally demonstrate the occurrence of a large valley Chern number. A frequency-dependent multimode beam splitter is theoretically proposed for high-performance integrated photonic device applications. These results provide new ideas for high-efficiency and high-capacity optical transmission and communication devices and their integration; furthermore, they broaden the application range of TESs.

multifrequency multimode topological photonic crystals valley Chern numbers

SCI ; EI

英语

其他

2-s2.0-85184420807

Scopus

1.Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices,School of Physics and Electronics,Hunan University,Changsha,410082,China
2.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.International Joint Innovation Center,The Electromagnetics Academy at Zhejiang University,Zhejiang University,Haining,314400,China

Yan，Bei,Peng，Yiwei,Xie，Jianlan,et al. Multifrequency and Multimode Topological Waveguides in a Stampfli-Triangle Photonic Crystal with Large Valley Chern Numbers[J]. Laser and Photonics Reviews,2024.

Yan，Bei.,Peng，Yiwei.,Xie，Jianlan.,Peng，Yuchen.,Shi，Aoqian.,...&Wen，Shuangchun.(2024).Multifrequency and Multimode Topological Waveguides in a Stampfli-Triangle Photonic Crystal with Large Valley Chern Numbers.Laser and Photonics Reviews.

Yan，Bei,et al."Multifrequency and Multimode Topological Waveguides in a Stampfli-Triangle Photonic Crystal with Large Valley Chern Numbers".Laser and Photonics Reviews (2024).