• Photonics Research
  • Vol. 12, Issue 10, 2226 (2024)
Xiangshuai Meng1, Haoyu Zhang1, Tao Wu2, Yu Li2..., Anxue Zhang1, Lei Ran3 and Xiaoming Chen1,*|Show fewer author(s)
Author Affiliations
  • 1School of Information and Communications Engineering, Xi’an Jiaotong University, Xi’an 710049, China
  • 2Xi’an Institute of Space Radio Technology, Xi’an 710199, China
  • 3National Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China
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    DOI: 10.1364/PRJ.530841 Cite this Article Set citation alerts
    Xiangshuai Meng, Haoyu Zhang, Tao Wu, Yu Li, Anxue Zhang, Lei Ran, Xiaoming Chen, "Anisotropic impedance holographic metasurface for near-field imaging," Photonics Res. 12, 2226 (2024) Copy Citation Text show less

    Abstract

    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.
    Eobj=(1,0,0)mMnNAmn|Ruvrmn|exp(jk0|Ruvrmn|jk0·ruv),

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    (ψobjψref*)ψref=ψobj|ψref|2,

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    kz/k0={j(Z02Zxy2+ZxxZyy)±[(Z02Zxy2+ZxxZyy)2+4Z02×(Zyycos2θkZxy  sin2θk+Zxxsin2θk)×(Zxxcos2θk+Zxy  sin2θk+Zyysin2θk)]1/2}×[2Z0(Zyycos2θkZxysin2θk+Zxxsin2θk)]1,

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    Jref=(xuv,yuv,0)ejk0n|ruv|/|ruv|.

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    Z·JrefEobj·|Jref|2.

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    Z=(ZxxZxyZyxZyy)=j(Xa00Xa)+jMa2Im(EobjJrefJrefEobj)=[jXa+jMa2Im(Exobj*JxrefExobj*Jref)jMa2Im(Eyobj*JxrefExobj*Jyref)jMa2Im(Exobj*JyrefEyobj*Jxref)jXa+jMa2Im(Eyobj*JyrefEyobj*Jyref)],

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    {Zxx=j[Xa+xuvMa|ruv|mMnNAmn|Ruvrmn|sin(k0|Ruvrmn|+k0n|ruv|k0xuvsinθrcosφrk0yuvsinθrsinφr)]Zxy=jyuvMa2|ruv|mMnNAmn|Ruvrmn|sin(k0|Ruvrmn|+k0n|ruv|k0xuvsinθrcosφrk0yuvsinθrsinφr)Zyy=jXa.

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    Xiangshuai Meng, Haoyu Zhang, Tao Wu, Yu Li, Anxue Zhang, Lei Ran, Xiaoming Chen, "Anisotropic impedance holographic metasurface for near-field imaging," Photonics Res. 12, 2226 (2024)
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