基于GaAs/Sb_(2)Se_(3)相变可调谐线性偏振器  

A tunable linear polarizer based on phase-change material using GaAs/Sb_(2)Se_(3)

作　　者：邓思珩 石磊东 陈洋 祝连庆[1] 鹿利单 Deng Siheng;Shi Leidong;Chen Yang;Zhu Lianqing;Lu Lidan(College of Instrument Science and Optoelectronic Engineering,Beijing Information Science and Technology University,Beijing 100096,China)

机构地区：[1]北京信息科技大学仪器科学与光电工程学院,北京100096

出　　处：《仪器仪表学报》2024年第11期161-169,共9页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(62205029);国家重点研发计划(2022YFF0705800)项目资助。

摘　　要：偏振超表面是一种新型光学器件,通过设计微纳米结构和选用适当的材料,能够精确控制光的偏振状态、相位和振幅。现有的大多偏振片由于固定的物理结构及材料特性使得功能较为单一且体积较大,难以满足现代光学系统对小型化和多功能化的需求。研究了一种基于全介电GaAs/Sb_(2)Se_(3)结构的可调谐相变偏振超表面,工作于近红外波段(780~1100 nm)。通过集成偏振转换元原子和相位转换元原子,设计出具有高透过率(99.625%)、高消光比(32.8 dB)及可控偏振角的线性偏振器件。特别地,通过引入相变材料硒化锑,实现了偏振片在不同相态下的动态调谐,使其在不同波段的偏振态控制上具有显著优势。通过理论分析和时域有限差分法仿真验证了设计的有效性,展现了该超表面在红外探测、成像和通信等领域的广泛应用潜力。该研究为光学系统的小型化和多功能化提供了创新解决方案,为未来材料优化和新应用探索奠定了基础。Polarization metasurfaces are innovative optical devices that can precisely control the polarization state,phase,and amplitude of light by designing micro-nano structures and of different materials.Most existing polarizers have limited functionality and larger sizes due to their fixed physical structures and material properties,making it difficult to meet the demands for miniaturization and multifunctionality in modern optical systems.This paper investigates a tunable phase-change polarization metasurface based on an all-dielectric GaAs/Sb_(2)Se_(3) structure operating in the near-infrared wavelength range(780~1100 nm).By integrating polarization conversion meta-atoms and phase-switching meta-atoms,a linear polarization device with high transmittance(99.625%),high extinction ratio(32.8 dB),and controllable polarization angle has been designed.Notably,the introduction of the phase-change material Sb 2Se 3 enables dynamic tuning of the polarizer under different phase states,offering significant advantages for controlling the polarization state across various wavelength ranges.The effectiveness of the design has been verified through theoretical analysis and finite-difference time-domain simulations,demonstrating the broad application potential of this metasurface in infrared detection,imaging,and communication.This research provides an innovative solution for the miniaturization and multifunctionality of optical systems and lays the foundation for future material optimization and exploration of new applications.Polarization metasurfaces are innovative optical devices that can precisely control the polarization state,phase,and amplitude of light by designing micro-nano structures of different materials.Most existing polarizers have limited functionality and larger sizes due to their fixed physical structures and material properties,making it difficult to meet the demands for miniaturization and multifunctionality in modern optical systems.This article investigates a tunable phase-change polarization metasurface base

关 键 词：超表面 相变材料 偏振调控 近红外 

分 类 号：TH741[机械工程—光学工程]