Dual-polarization two-dimensional valley photonic crystals  

作　　者：Xin-Tao He Jian-Wei Liu Fu-Long Shi Ke Shen Wen-Jie Chen Xiao-Dong Chen Jian-Wen Dong 

机构地区：[1]School of Physics,State Key Laboratory of Optoelectronic Materials and Technologies,Sun Yat-sen University,Guangzhou,510275,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2022年第8期102-109,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12074443,62035016,and 11904421);Guangdong Basic and Applied Basic Research Foundation(Grant No.2019B151502036);Guangzhou Science,Technology and Innovation Commission(Grant Nos.201904010223,202002030322,and 202102020693);the Fundamental Research Funds for the Central Universities(Grant Nos.20lgzd29,20lgjc05,and 2021qntd27)。

摘　　要：The recent realization of valley physics in photonic systems has enriched the topological phases of light with protected edge modes and shown applications in designing high-performance photonic devices. However, the widely reported valley Hall effect of light in two-dimensional systems is limited to one single polarization. Here, we present dual-polarization two-dimensional valley photonic crystals by simultaneously opening two frequency accidental degenerate Dirac cones. Two band gaps with different polarizations are characterized by opposite-valley Chern numbers, which are confirmed by the opposite-phase vortex distributions of bulk modes and opposite Berry curvatures. This situation results in the polarization-dependent refraction of bulk and edge modes, which locate in opposite valleys. The polarization-independent topological valley transport is also demonstrated. Our work shows the flexible control of light in topological photonic systems with a polarization degree of freedom and has applications in polarization multiplexing photonic devices.

关 键 词：topological photonics valley photonic crystals polarization 

分 类 号：O734[理学—晶体学]