Volumetric Generation of Optical Vortices with Metasurfaces
Volumetric Generation of Optical Vortices with Metasurfaces
复制标题
超表面光学涡旋的体积生成
DOI：
10.1021/acsphotonics.6b00808
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发表时间：
2017-02-01
期刊：
影响因子：
7
通讯作者：
Zentgref, Thomas
中科院分区：
文献类型：
--
作者：
Huang, Lingling;Song, Xu;Zentgref, Thomas
超表面（即组装到表面上的工程纳米级夹杂物的二维阵列）的最新进展彻底改变了用超薄、紧凑组件控制电磁波的方式。携带轨道角动量的光学涡旋光束的产生已成为从高容量光通信到并行激光制造等应用的重要方法。然而，用于产生光学涡流的通常体积庞大的元件对亚波长足迹的片上集成施加了根本限制。在这里，我们研究并实验演示了基于光物质与高效介电超表面相互作用的三维体积光学涡旋生成。通过采用达曼涡旋光栅和螺旋达曼波带片的概念，实现了从可见光到近红外波长的具有微米空间分离的3D光学涡旋阵列。重要的是，我们证明了拓扑电荷是由设计控制的。分布可以在空间上变化并且完全
Recent advances in metasurfaces, i.e., two-dimensional arrays of engineered nanoscale inclusions that are assembled onto a surface, have revolutionized the way to control electromagnetic waves with ultrathin, compact components. The generation of optical vortex beams, which carry orbital angular momentum, has emerged as a vital approach to applications ranging from high-capacity optical communication to parallel laser fabrication. However, the typically bulky elements used for the generation of optical vortices impose a fundamental limit toward on-chip integration with subwavelength footprints. Here, we investigate and experimentally demonstrate a three-dimensional volumetric optical vortices generation based on light matter interaction with a high-efficiency dielectric metasurface. By employing the concepts of Dammann vortex gratings and spiral Dammann zone plates, a 3D optical vortex array with micrometer spatial separation is achieved from visible to near-infrared wavelengths. Importantly, we show that the topological charge controlled by the design. distribution can be spatially variant and fully