Cui Guosen, Gu Manna, Cheng Chen, Zhang Ziheng, Zhou Yuxiang, Dong Qingrui, Gao Song, Choi Duk-Yong, Cheng Chuanfu, Liu Chunxiang
School of Physics and Electronics, Shandong Normal University, Jinan, 250014, China.
School of Information Science and Engineering and Shandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan, Shandong 250022, China.
Nanophotonics. 2024 Mar 6;13(9):1631-1644. doi: 10.1515/nanoph-2023-0923. eCollection 2024 Apr.
The generation of vector beams using metasurfaces is crucial for the manipulation of light fields and has significant application potential, ranging from classical physics to quantum science. This paper introduces a novel dielectric metasurface composed of quarter-wave plate (QWP) meta-atoms, known as a QWP metasurface, designed to generate focused vector beams (VBs) of Bell-like states under right circularly polarized illumination. The propagation phase imparted on both the co- and cross-polarized components of the output field constructs hyperbolic and helical phase profiles with topological charge , whereas the Pancharatnam-Berry (PB) phase acts only on the cross-polarized component to construct another helical phase profile with topological charge . Thus, the co- and cross-polarized components form two orthogonal vector vortex (VV) modes with topological charges and + , respectively. When the parameter conditions are satisfied by matching the incident polarization chirality and topological charges and , the focused VBs of Bell-like states are generated by simultaneously manipulating the two VV modes, in contrast to existing QWP metasurfaces. The polarization states of the generated VBs are manipulated using the initial orientation angle of the meta-atom. Overall, this research provides an innovative strategy for metasurface design, enhancing the functionality of metasurface devices for a broader range of application scenarios.
利用超表面产生矢量光束对于光场调控至关重要，并且具有巨大的应用潜力，其应用范围涵盖从经典物理到量子科学等领域。本文介绍了一种由四分之一波片（QWP）元原子组成的新型介电超表面，即QWP超表面，它被设计用于在右旋圆偏振照明下产生类贝尔态的聚焦矢量光束（VBs）。施加在输出场的共偏振和交叉偏振分量上的传播相位构建了具有拓扑电荷 的双曲线和螺旋相位分布，而潘查拉特纳姆 - 贝里（PB）相位仅作用于交叉偏振分量以构建另一个具有拓扑电荷 的螺旋相位分布。因此，共偏振和交叉偏振分量分别形成两个具有拓扑电荷 和 + 的正交矢量涡旋（VV）模式。与现有的QWP超表面不同，当通过匹配入射偏振手性 以及拓扑电荷 和 满足参数条件时，通过同时操控这两个VV模式来产生类贝尔态的聚焦VBs。所产生的VBs的偏振态利用元原子的初始取向角 进行操控。总体而言，本研究为超表面设计提供了一种创新策略，增强了超表面器件在更广泛应用场景中的功能。
