Controllable Absorption/Polarization Conversion Metasurface Based on Graphene and Vanadium Dioxide
In this paper,it proposes a controllable metasurface based on graphene and vanadium dioxide(VO2).By adjusting their conductivity,the metasurface can achieve dual-peak absorption and broadband linear-linear polarization conversions functions.The simulated results show that when the graphene Fermi energy is at1eV and the VO2 is in insulating state,the metasurface operates in absorption mode,absorbing near100%energy at 0.96 THzand 2.23 THz;when the graphene Fermi energy is at 0.1 eV and the VO2 is in metal state,it transforms into linear-linear polarization conversion mode,and the polarization conversion ratereaches 90%in the range of 1.56-3.56 THz.Meanwhile,the working mechanism of the metasurface proposed in this paper is elucidated in de-tail by the surface current distributions.This proposal promises to have an important application in the compact ter-ahertz devices such as polarization controller,imaging,sensing,and other fields.
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