Tying Polarization-Switchable Optical Vortex Knots and Links via Holographic All-Dielectric Metasurfaces
Tying Polarization-Switchable Optical Vortex Knots and Links via Holographic All-Dielectric Metasurfaces
复制标题
通过全息全电介质超表面连接偏振可切换光学涡旋结和链接
DOI：
10.1002/lpor.201900366
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发表时间：
2020-02-10
影响因子：
11
通讯作者：
Zhao, Jianlin
中科院分区：
文献类型：
--
作者：
Guo, Xuyue;Li, Peng;Zhao, Jianlin
裁剪多自由度光场的空间结构是近年来的研究热点。光场的拓扑结构作为光场中最吸引人的结构之一，如与相位奇点相关的涡旋结和涡旋链，无论是在理论研究还是在实际应用中都引起了越来越多的关注。本文提出并实验证明了一种全介质超颖表面器件可以在微尺度光场中构建涡旋结和涡旋链。这两种不同的拓扑结构可以通过改变入射偏振来切换。利用数字全息干涉的方法，这些涡度线的拓扑结构的准确特征在三维空间，并证明了这种超小领域的拓扑保持的演变。这两种典型的结构增强了利用紧凑元器件实现多通道拓扑控制的能力。这一工作将推动结构光场在微尺度上的应用，甚至是其他超小尺寸物理场的创建。
Tailoring the spatial structure of light field in multiple degrees of freedom is a research hotspot in recent years. The topology of light field, as one of the most fascinating structures, such as vortex knots and links associated with the phase singularities, is evoking increasing attention both in fundamental research and practical application. Here, an all-dielectric metasurface device is proposed and experimentally demonstrated that can construct vortex knots and links in light field at the micro scale. These two distinct topological configurations can be switched by changing the incident polarization. Utilizing the digital holographic interference method, these topological configurations of vorticity lines are accurately characterized in three-dimensions, and the topology-preserving evolution of such ultra-small fields is demonstrated. These two classical configurations exemplify the capability of multichannel manipulating topology by compact metadevice. The work may promote the application of structured light filed at the micro scale and even the creation of other physical fields with ultra-small size.