Completely spin-decoupled geometric phase of a metasurface

几何相位 物理 旋转(数学) 相(物质) 几何形状 自旋(空气动力学) 电流(流体) 曲面(拓扑) 光学 几何学 凝聚态物理 量子力学 数学 热力学
作者
Xiangsheng Fu,Jie Yang,Jiafu Wang,Yiping Han,chang ding,Tianshuo Qiu,Bingyue Qu,Lei Li,Yongfeng Li,Shaobo Qu
出处
期刊:Photonics Research [Optica Publishing Group]
卷期号:11 (7): 1162-1162 被引量:1
标识
DOI:10.1364/prj.473698
摘要

Metasurfaces have provided an unprecedented degree of freedom (DOF) in the manipulation of electromagnetic waves. A geometric phase can be readily obtained by rotating the meta-atoms of a metasurface. Nevertheless, such geometric phases are usually spin-coupled, with the same magnitude but opposite signs for left- and right-handed circularly polarized (LCP and RCP) waves. To achieve independent control of LCP and RCP waves, it is crucial to obtain spin-decoupled geometric phases. In this paper, we propose to obtain completely spin-decoupled geometric phases by engineering the surface current paths on meta-atoms. Based on the rotational Doppler effect, the rotation manner is first analyzed, and it is found that the generation of a geometric phase lies in the rotation of the surface current paths on meta-atoms. Since the induced surface current paths under the LCP and RCP waves always start oppositely and are mirror-symmetrical with each other, it is natural that the geometric phases have the same magnitude and opposite signs when the meta-atoms are rotated. To obtain spin-decoupled geometric phases, the induced surface current under one spin should be rotated by one angle while the current under the other spin is rotated by a different angles. In this way, LCP and RCP waves can acquire different geometric phase changes. Proof-of-principle prototypes were designed, fabricated, and measured. Both the simulation and experiment results verify spin-decoupled geometric phases. This work provides a robust means to obtain a spin-dependent geometric phase and can be readily extended to higher frequency bands such as the terahertz, IR, and optical regimes.

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