Multiplexing near-and far-field functionalities with high-efficiency bi-channel metasurfaces  

作　　者：Changhong Dai Tong Liu Dongyi Wang 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,200438 Shanghai,People’s Republic of China [2]Department of Physics,The Hong Kong University of Science and Technology,Clear Water Bay,Kowloon,Hong Kong,China [3]Department of Physics,Hong Kong Baptist University,Kowloon Tong,Hong Kong,China [4]Shanghai Key Laboratory of Metasurfaces for Light Manipulation,200433 Shanghai,People’s Republic of China

出　　处：《PhotoniX》2024年第1期532-546,共15页智汇光学(英文)

基　　金：funded by National Key Research and Development Program of China(Grant No.2022YFA1404701);National Natural Science Foundation of China(Grant Nos.12221004,62192771);Natural Science Foundation of Shanghai(Grant No.23dz2260100).

摘　　要：Propagating waves and surface waves are two distinct types of light-transporting modes,the free control of which are both highly desired in integration photonics.However,previously realized devices are bulky in sizes,inefficient,and/or can only achieve one type of light-manipulation functionality with a single device.Here,we propose a generic approach to design bi-channel meta-devices,constructed by carefully selected meta-atoms possessing reflection phases of both structural-resonance and geometric origins,which can exhibit two distinct light-manipulation functionalities in near-field(NF)and far-field(FF)channels,respectively.After characterizing the scattering properties of basic meta-atoms and briefly stating the theoretical strategy,we design/fabricate three different meta-devices and experimentally characterize their bi-channel wave-control functionalities in the telecom regime.Our experiments show that the first two devices can multiplex the generations of NF and FF optical vortices with different topological charges,while the third one exhibits anomalous surface plasmon polariton focusing in the NF and hologram formation in the FF simultaneously.Our results expand the wave-control functionalities of metasurfaces to all wave-transporting channels,which may inspire many exciting applications in integration optics.

关 键 词：Bi-channel metasurfaces Near-field(NF)channels Far-field(FF)channels Integration photonics Structural-resonance Geometric phase Optical vortice Surface plasmon polariton HOLOGRAM 

分 类 号：O41[理学—理论物理]