Single-layered non-interleaved spin-insensitive metasurfaces for wavefront engineering  

作　　者：Ata Ur Rahman Khalid Naeem Ullah 韩遇 Urooj Asghar 袁小聪 冯甫 Ata Ur Rahman Khalid;Naeem Ullah;Yu Han;Urooj Asghar;Xiaocong Yuan;Fu Feng(Nanophotonics Research Center,Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518000,China;College of Physics and Optoelectronics Engineering,Shenzhen University,Shenzhen 518000,China;Beijing Engineering Research Center for Mixed Reality and Advanced Display,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Department of Physics,Forman Christian College-University,Lahore 54600,Pakistan)

机构地区：[1]Nanophotonics Research Center,Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518000,China [2]College of Physics and Optoelectronics Engineering,Shenzhen University,Shenzhen 518000,China [3]Beijing Engineering Research Center for Mixed Reality and Advanced Display,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China [4]Department of Physics,Forman Christian College-University,Lahore 54600,Pakistan

出　　处：《Chinese Optics Letters》2023年第1期32-37,共6页中国光学快报（英文版）

摘　　要：Metasurfaces,two-dimensional(2D)or quasi-2D arrays of dielectric or metallic meta-atoms,offer a compact and novel platform to manipulate the amplitude,phase,and polarization of incoming wavefronts in a desired manner by engineering the geometry of meta-atoms.In polarization control,spin-insensitive metasurfaces have attracted significant attention due to the robustness of circular polarization against the beam misalignment and multi-path effects.Till now,several efforts have been made to realize polarization-insensitive metasurfaces for circularly polarized(CP)wavefront manipulation;however,these metasurfaces only consider the cross-polarization channels and keep the co-polarization channels abandoned.Such metasurfaces cannot be considered truly spin-insensitive,as one has to carefully choose the analyzer at output.Here,by combining the polarization-insensitive geometric phase and engineered propagation phase,we propose a spin-insensitive design principle based on metasurfaces that can perform identical functionality(on co-and crosspolarization channels)irrespective of the handedness of incident/transmitted light.As a proof of concept,we design and numerically realize two types of spin-insensitive wavefront engineering devices:(1)spin-insensitive meta-hologram and(2)spin-insensitive beam deflector with power splitting functionality.The proposed work is expected to open up new avenues for developing spin-independent metasurfaces-based devices.

关 键 词：metasurface spin-insensitivity meta-hologram beam splitter 

分 类 号：O43[机械工程—光学工程]