Volumetric Generation of Optical Vortices with Metasurfaces

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• 作者：Lingling HuangXu Song ; Bernhard Reineke ; Tianyou Li ; Xiaowei Li ; Juan Liu ; Shuang Zhang ; Yongtian Wang ; Thomas Zentgraf
• 刊名：ACS Photonics
• 出版年：2017
• 出版时间：February 15, 2017
• 年：2017
• 卷：4
• 期：2
• 页码：338-346
• 全文大小：790K
• ISSN：2330-4022

文摘

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 distribution can be spatially variant and fully controlled by the design.