Wavevector and Frequency Multiplexing Performed by a Spin‐Decoupled Multichannel Metasurface

• DOI: 10.1002/admt.201900710
• Publication Date: 2019-12-02T21:27:52Z
• Authors: He‐Xiu Xu; Guangwei Hu; Menghua Jiang; Shiwei Tang; Yanzhao Wang; Chaohui Wang; Yongjun Huang; Xiaohui Ling; Haiwen Liu; Jiafeng Zhou
• Keywords: Proof of concept; Wave vector

Abstract Achieving kaleidoscopic wavefront controls with a thin flat plate is pivotal for increasing data capacity yet still challenging in integrated optics. An anisotropic metasurface provides an efficient recipe primarily linear polarization, but less multiple functionalities at arbitrary spin states. Here, strategy of realizing spin‐decoupled high‐capacity multifunctional by multiplexing the frequency and wavevector degree freedom (DoF) reported. By integrating both geometric dynamic phases split ring resonators crossbars chessboard configuration, inherent limitation spin‐flipped Pancharatnam–Berry can be completely decoupled between two Such released extraordinary DoF unprecedentedly increases capability to yield control. To verify significance, proof‐of‐concept metadevices that are nearly impossible conventional metasurfaces experimentally demonstrated four‐port manipulations, exhibiting spin‐, frequency‐, wavevector‐dependent anomalous reflections, lensing, orbital angular momentum generation, wavevector‐multiplexed vortex scattering, along two‐dimensional holograms. Both numerical experimental results illustrate quad‐distinct up ten channel beams ≈93% efficiency, because suppressed crosstalk among different operation modes, wavevectors, spins. The finding triple‐DoF expected generate great interest electromagnetic integration emerging DoFs.