Anisotropic impedance holographic metasurface for near-field imaging  

作　　者：XIANGSHUAI MENG HAOYU ZHANG TAO WU YU LI ANXUE ZHANG LEI RAN XIAOMING CHEN 

机构地区：[1]School of Information and Communications Engineering,Xi’an Jiaotong University,Xi’an 710049,China [2]Xi’an Institute of Space Radio Technology,Xi’an 710199,China [3]National Key Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China

出　　处：《Photonics Research》2024年第10期2226-2234,共9页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(62101426,62301417);China Postdoctoral Science Foundation(2020M683482);Foundation of National Key Laboratory of Radar Signal Processing(JKW202306)。

摘　　要：In this paper,the concept of anisotropic impedance holographic metasurface is proposed and validated by realizing holographic imaging with multipoint focusing techniques in near-field areas at the radio frequency domain.Combining the microwave holographic leaky-wave theory and near-field focusing principle,the mapped geometrical patterns can be constructed based on the correspondence between meta-atom structural parameters and equivalent scalar impedances in this modulated metasurface.Different from conventional space-wave modulated holographic imaging metasurfaces,this surface-wave-based holographic metasurface fed by monopole antenna embedded back on metal ground enables elimination of the misalignment error between the air feeding and space-wave-based metasurface and increase of the integration performance,which characterizes ultra-low profile,low cost,and easy integration.The core innovation of this paper is to use the classical anisotropic equivalent surface impedance method to achieve the near-field imaging effect for the first time.Based on this emerging technique,a surface-wave meta-hologram is designed and verified through simulations and experimental measurements,which offers a promising choice for microwave imaging,information processing,and holographic data storage.

关 键 词：SURFACE HOLOGRAPHIC IMPEDANCE 

分 类 号：O438.1[机械工程—光学工程] TP391.41[理学—光学]