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Free control of far-field scattering angle of transmission terahertz wave using multilayer split-ring resonators’ metasurfaces |
Ying Tian1, Xufeng Jing1( ), Haiyong Gan2(), Chenxia Li1, Zhi Hong1 |
1. Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China
2. National Institute of Metrology, Beijing 102200, China |
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Abstract To enhance transmission efficiency of Pancharatnam–Berry (PB) phase metasurfaces, multilayer splitring resonators were proposed to develop encoding sequences. As per the generalized Snell’s law, the deflection angle of the PB phase encoding metasurfaces depends on the metasurface period’s size. Therefore, it is impossible to design an infinitesimal metasurface unit; consequently, the continuous transmission scattering angle cannot be obtained. In digital signal processing, this study introduces the Fourier convolution principle on encoding metasurface sequences to freely control the transmitted scattering angles. Both addition and subtraction operations between two different encoding sequences were then performed to achieve the continuous variation of the scattering angle. Furthermore, we established that the Fourier convolution principle can be applied to the checkerboard coded metasurfaces.
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| Keywords
metamaterial
metasurface
scattering
Fourier convolution
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Corresponding Author(s):
Xufeng Jing,Haiyong Gan
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Just Accepted Date: 29 September 2020
Issue Date: 03 November 2020
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