Fig. 1. Structural diagram of polarization conversion/absorption metasurface. (a) 4×4 array diagram; (b) structural diagram of unit cell; (c) hexagon-shaped graphene resonator; (d) split hexagon-shaped metal resonator

Fig. 2. Reflection coefficient, PCR and absorptivity curves obtained by simulation. (a) Reflection coefficient and PCR of polarization conversion mode; (b) reflection coefficient and absorptivity of absorption mode; (c) PCR under different conductivities of vanadium dioxide; (d) absorptivity under different Fermi energies of graphene

Fig. 3. Orthogonal eigenmodes and normalized complex impedance. (a) Amplitudes and phase difference when the electric field of incident electromagnetic wave along u-axis and v-axis in polarization conversion mode; (b) normalized complex impedance in absorption mode

Fig. 4. Surface current distribution. (a)--(f) Polarization conversion mode; (g)--(l) absorption mode

Fig. 5. Magnetic field distribution at resonant frequencies. (a)(b) polarization conversion mode; (c)(d) absorption mode

Fig. 6. PCR and absorptivity under different structure parameters. (a) PCR at different radii of split hexagon-shaped ring; (b) PCR at different widths of split hexagon-shaped ring; (c) absorptivity at different radii of hexagon-shaped graphene

Fig. 7. Performance of metasurface at different incident angles and effect of polarization angle on absorptivity. (a) PCR under different incident angles; (b) absorptivity of TE mode under different incident angles; (c) absorptivity of TM mode under different incident angles; (d) absorptivity under different polarization angles