Controlling angular dispersions in optical metasurfaces  

作　　者：Xiyue Zhang Qi Li Feifei Liu Meng Qiu Shulin Sun Qiong He Lei Zhou 

机构地区：[1]State Key Laboratory of Surface Physics,Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education),and Department of Physics,Fudan University,Shanghai 200438,China [2]Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing,Green Photonics and Department of Optical Science and Engineering,Fudan University,Shanghai 200433,China [3]Academy for Engineering and Technology,Fudan University,Shanghai 200433,China [4]Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China

出　　处：《Light(Science & Applications)》2020年第1期1286-1297,共12页光（科学与应用)（英文版）

基　　金：funded by the National Natural Science Foundation of China(Nos.91850101,11734007,11674068,and 11874118);the National Key Research and Development Program of China(Nos.2017YFA0303504 and 2017YFA0700201);the Natural Science Foundation of Shanghai(No.18ZR1403400);the Fudan University-CIOMP Joint Fund(No.FC2018-006);the technical support from the Fudan Nanofabrication Laboratory for sample fabrication.

摘　　要：Although metasurfaces have shown great potential for manipulating light,most previously realized meta-devices suffer from uncontrolled angular dispersions,making them unfavorable for many applications.Here,we propose a general strategy to realize optical metasurfaces with desired angular dispersions based on carefully controlling both the near-field couplings between meta-atoms and the radiation pattern of a single meta-atom.Utilizing such a strategy,we experimentally demonstrate a series of optical meta-devices with predesigned angular dispersions,including two incident-angle-insensitive absorbers,one incident-angle-selective absorber,and one multifunctional meta-polarizer whose functionality changes from a perfect mirror to a half-waveplate as the excitation angle varies.Finally,we design a gradient meta-device using meta-atom arrays with purposely controlled angular dispersions and numerically demonstrate that it can exhibit distinct wavefront-control functionalities when illuminated at different incident angles.Our findings establish a new platform for achieving angle-multiplexed functional meta-devices,significantly expanding the wave-manipulation capabilities of optical metasurfaces.

关 键 词：ANGULAR DISPERSION ABSORBER 

分 类 号：O57[理学—粒子物理与原子核物理]