Abstract
Two graphene-based tunable coding metasurfaces are proposed for beam steering in terahertz band. The coding metasurfaces are composed of the unit cell with a sandwich-like structure, which contains the top layer of anisotropic rectangular graphene structure, intermediate dielectric layer and ground plane. The designed metasurfaces can be dynamically adjusted since the characteristics of unit cell are changed by the chemical potential of graphene. When the relaxation time and chemical potential of graphene are 0.8 ps and 0.85 eV, respectively. The coding metasurfaces could realize beam steering in 1.30 THz-1.70 THz. On the other hand, when the chemical potential of graphene is 0 eV, two metasurfaces without beam steering in this band. The designed graphene-based tunable coding metasurfaces has potential application value in the fields of terahertz communication, sensing, etc.
Highlights
In recent years, terahertz science and technology has developed rapidly, and it has shown the promising application prospects in communication, imaging and nondestructive testing [1,2,3]
We proposed two tunable coding metasurfaces based on graphene for beam steering in terahertz band
The coding metasurfaces formed by the unit cells which can achieve cross-polarization conversion from 1.30 THz to 1.70 THz, and the amplitude of cross-polarization conversion over 90%
Summary
Terahertz science and technology has developed rapidly, and it has shown the promising application prospects in communication, imaging and nondestructive testing [1,2,3]. More and more metasurfaces for control THz waves is presented, for example, wave plate [8], hologram [9], vector beam [10] and generation of non-linear harmonic wave [11] Most of these proposed terahertz metasurfaces with fixed performances after the design is completed, which limits their application. The conductivity of graphene can be adjusted by the chemical potential [15,16,17], the chemical potential of graphene can be changed by chemical doping and applying bias voltage It is available for tunable terahertz metasurfaces to realize dynamic regulation of THz waves. The electromagnetic properties of unit cell are adjusted due to the change of graphene chemical potential, so the coding metasurfaces is tunable
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