首页|Harpoon-shaped topological photonic crystal for on-chip beam splitter

Harpoon-shaped topological photonic crystal for on-chip beam splitter

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The advancement of integrated optical communication networks necessitates the deployment of on-chip beam splitters for efficient signal interconnections at network nodes.However,the pursuit of micron-scale beam splitting with large comers and reducing the device footprint to boost connection flexibility often results in phase mismatches.These mismatches,which stem from radiation modes and backward scattering,pose significant obstacles in creating highly integrated and interference-resistant connections.To address this,we introduce a solution based on the topological valley-contrasting state generated by photonic crystals with opposing valley Chem numbers,manifested in a harpoon-shaped structure designed to steer the splitting channels.This approach enables adiabatic mode field evolution over large comers,capitalizing on the robust phase modulation capabilities and topological protection provided by the subwavelength-scale valley-contrasting state.Our demonstration reveals that beam splitters with large corners of 60°,90°,and 120° exhibit insertion loss fluctuations below 2.7 dB while maintaining a minimal footprint of 8.8 μm × 8.8 μm.As a practical demonstration,these devices facilitate three-channel signal connections,success-fully transmitting quadrature phase shift keying signals at 3.66 Tbit/s with bit error rates below the forward error correction threshold,demonstrating performance comparable to that in defects scenarios.By harnessing the unidirectional excitation feature,we anticipate significant enhancements in the capabilities of signal distribution and connection networks through a daisy chain configuration.

channel interconnectionon-chip beam splittertopological valley-contrasting state

Zhiwei Guan、Ruixue Dou、Chuangxin Xie、Tianyimei Zuo、Liyu Huang、Keyin Wen、Chaofeng Wang、Huapeng Ye、Junmin Liu、Ze Dong、Dianyuan Fan、Shuqing Chen

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Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China

College of Physics and Engineering Technology,Minzu Normal University of Xingyi,Xingyi 562400,China

Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays,South China Academy of Advanced Optoelectronics,South China Normal University,Guangzhou 510006,China

College of New Materials and New Energies,Shenzhen Technology University,Shenzhen 518118,China

School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China

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National Natural Science Foundation of ChinaGuangdong Basic and Applied Basic Research FoundationShenzhen Science and Technologv ProgramNatural science Foundation of Top Talent of SZTUQianxinan Prefecture Science and Technology Plan ProjectScientific Research Fund Project of Minzu Normal University of Xingyi

622713222023A1515030152JCYJ20210324095610027GDRC202204202312323XYZD07

2024

10.1007/s11433-024-2421-3

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(9)