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Configurable topological beam splitting via antichiral gyromagnetic photonic crystal
通过反手性旋磁光子晶体可配置拓扑分束
アンチキラル磁気回転フォトニック結晶を介した構成可能なトポロジカルビーム分割
안티키랄 자이로마그네틱 포토닉 크리스탈을 통한 구성 가능한 토폴로지 빔 분할
División de haz topológico configurable a través de cristal fotónico giromagnético antiquiral
Séparation de faisceau topologique configurable via un cristal photonique gyromagnétique antichiral
Настраиваемое топологическое разделение луча с помощью антихирального гиромагнитного фотонного кристалла
Jianfeng Chen 陈剑锋 ¹, Zhi-Yuan Li 李志远 ¹ ²
¹ School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
中国 广州 华南理工大学物理与光电学院
² State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
中国 广州 华南理工大学发光材料与器件国家重点实验室
Opto-Electronic Science, 20 May 2022
Abstract

Antichiral gyromagnetic photonic crystal (GPC) in a honeycomb lattice with the two interpenetrating triangular sublattices A and B magnetically biased in opposite directions can realize antichiral one-way edge states propagating along the same direction at its two parallel edges. Here, we report the construction and observation of topological beam splitting with the easily adjustable right-to-left ratio in an antichiral GPC.

The splitter is compact and configurable, has high transmission efficiency, and allows for multi-channel utilization, crosstalk-proof, and robust against defects and obstacles. This magnificent performance is attributed to the peculiar property that antichiral one-way edge states exist only at zigzag edge but not at armchair edge of antichiral GPC.

When we combine two rectangular antichiral GPCs holding left- and right-propagating antichiral one-way edge states respectively, bidirectionally radiating one-way edge states at two parallel zigzag edges can be achieved. Our observations can enrich the understanding of fundamental physics and expand topological photonic applications.
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