Generation of multi-channel perfect vortex beams with the controllable ring radius and the topological charge based on an all-dielectric transmission metasurface
Generation of multi-channel perfect vortex beams with the controllable ring radius and the topological charge based on an all-dielectric transmission metasurface
复制标题
基于全电介质传输超表面的环半径可控和拓扑荷的多通道完美涡旋光束的生成
DOI：
10.1364/oe.468616
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发表时间：
2022
期刊：
影响因子：
3.8
通讯作者：
Hongzhan Liu
中科院分区：
文献类型：
--
作者：
Yue Liu;Chengxin Zhou;Kuangling Guo;Zhongchao Wei;Hongzhan Liu
完美涡旋（PV）光束的特点是携带轨道角动量和与拓扑电荷无关的径向电场强度分布，在光通信、粒子操纵和量子光学中具有重要应用。产生光伏光束的传统方法需要一系列彼此紧密准直的笨重光学元件，这增加了光学系统的复杂性。这里，使透射同偏振和交叉偏振分量的幅度恒定，基于纯相位调制方法构建了集成螺旋相位板、轴锥镜和傅里叶透镜的具有叠加相位轮廓的全介电透射超表面。通过数学推导和数值模拟，结合传播相位和几何相位，首次实现了圆偏振光入射下具有可控环形半径和拓扑电荷的多通道光伏光束。同时，PV光束分别在左旋圆偏振光和右旋圆偏振光入射下叠加，产生完美的矢量涡旋光束。这项工作为生成定制光伏光束、提高设计灵活性并促进紧凑、集成和多功能纳米光子平台的构建提供了新的视角。
The perfect vortex (PV) beam, characterized by carrying orbital angular momentum and a radial electric intensity distribution independent of the topological charge, has important applications in optical communication, particle manipulation, and quantum optics. Conventional methods of generating PV beams require a series of bulky optical elements that are tightly collimated with each other, adding to the complexity of optical systems. Here, making the amplitude of transmitted co-polarized and cross-polarized components to be constant, all-dielectric transmission metasurfaces with superimposed phase profiles integrating spiral phase plate, axicon and Fourier lens are constructed based on the phase-only modulation method. Using mathematical derivation and numerical simulation, multi-channel PV beams with controllable annular ring radius and topological charge are realized for the first time under circularly polarized light incidence combining the propagation phase and geometric phase. Meanwhile, perfect vector vortex beams are produced by superposition of PV beams under the incidence of left-handed circularly polarized and right-handed circularly polarized lights, respectively. This work provides a new perspective on generating tailored PV beams, increasing design flexibility and facilitating the construction of compact, integrated, and versatile nanophotonics platforms.