题目：Metasurfaces from vectorial light field to topological state
报告人：李向平
时间：5月15日 10:30
地点：LE201
邀请人：韩德专
报告人介绍：
李向平 (Xiangping Li) 男，暨南大学光子技术研究院教授。2009年获斯威本科技大学光子学博士学位。2011-2014年获得澳大利亚研究委员会优秀青年项目资助(ARC APD fellowship)。2013年荣获维多利亚州政府优秀青年称号(Victoria Fellowship). 2014年10月再次荣获澳大利亚研究委员会优秀青年项目资助 (ARC DECRA fellowship). 2015年入选国家级人才，受聘暨南大学光子技术研究所, 担任教授及博士生导师。同年荣获基金委优青人才计划资助. 主要研究领域包括等离激元、超构表面、超分辨及多维光存储技术等。近五年在包括Science, Nature Nanotechnology, Nature Communications， Light Science & Applications，Nano Letters 等国际期刊发表论文超过50篇。
报告摘要：
Metasurfaces, composed of arrays of subwavelength meta-atoms with exquisitely tailored geometries, have offered unprecedented prospects for light management and wavefront shaping. The captivation is built upon the know-hows by establishing the “library” of subwavelength meta-atoms with various complex two-dimensional (2D) geometries with a uniform flat-profile. Even the upsurge in metasurfaces based on various meta-atom designs has impelled marvelous developments such as lenses, holograms, illusionary optics and color prints, the underlying physics for phase manipulations restrict the current metasurfaces with polarization control limited only to orthogonal linear or circular polarizations. To tackle this bottle neck issue, a diatomic metasurface is proposed to realize vectorial holography with arbitrary polarization control. By controlling the displacements between adjacent meta-atoms with identical geometries and their orientations, we showcase that the phase and polarization of the diffracted beam can be completely and continuously shaped for versatile functionalities.
