Creating Composite Vortex Beams with a Single Geometric Metasurface
Creating Composite Vortex Beams with a Single Geometric Metasurface
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DOI：
10.1002/adma.202109714
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发表时间：
2022-03-28
影响因子：
29.4
通讯作者：
Chen, Xianzhong
中科院分区：
文献类型：
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作者：
Ming, Yang;Intaravanne, Yuttana;Chen, Xianzhong
复合涡旋光束由于其独特的光学性质和潜在的应用前景，近年来引起了人们的广泛关注。然而，这些光束主要是使用空间光调制器产生的，其具有体积大、成本高和分辨率有限的缺点。受益于光操纵的可伸缩性和前所未有的能力，光学超颖表面提供了一个紧凑的平台来执行这项任务。提出并实验证明了一种创建这些CVB的元表面方法。该设计基于具有不同拓扑电荷的多个圆偏振涡旋光束的叠加，其基于由具有空间变化取向的金属纳米棒组成的几何超表面来实现。实验分析了初始相位、振幅系数、入射偏振态和传输距离对产生的CVB的影响，结果与理论预测吻合较好。这项工作为以最小的足迹设计CVB开辟了一条新的途径，其应用范围从多个光阱到量子科学。
Composite vortex beams (CVBs) have attracted considerable interest recently due to the unique optical properties and potential applications. However, these beams are mainly generated using spatial light modulators, which suffer from large volume, high cost, and limited resolution. Benefiting from the ultrathin nature and unprecedented capability in light manipulation, optical metasurfaces provide a compact platform to perform this task. A metasurface approach to creating these CVBs is proposed and experimentally demonstrated. The design is based on the superposition of multiple circularly polarized vortex beams with different topological charges, which is realized based on a geometric metasurface consisting of metallic nanorods with spatially variant orientations. The effects of the initial phases, amplitude coefficients, incident polarization state, and propagation distance on the generated CVBs, which are in good agreement with the theoretical prediction, are experimentally analyzed. This work has opened a new avenue for engineering CVBs with a minimal footprint, which has promising applications ranging from multiple optical traps to quantum science.