Fig. 1. Front and side views of unit structure

Fig. 2. Schematic diagram of polarization conversion of linear polarization converter (x-polarized wave to y-polarized wave)

Fig. 3. Co-polarization and cross-polarization reflection coefficients of polarization converter (x-polarized wave incidence)

Fig. 4. PCR of polarization converter

Fig. 5. Schematic diagram of metasurface in uov coordinate system

Fig. 6. Reflection coefficient and phase change of polarization converter in uov coordinate system. (a) Reflection coefficient in uv direction; (b) phase and phase difference

Fig. 7. Ellipticity curve of reflected wave

Fig. 8. Surface current distributions on metasurface. (a) 0.649 THz surface current distribution; (b) 1.345 THz surface current distribution

Fig. 9. Fabry-Perot multiple interference model

Fig. 10. Numerical calculation and simulation calculation values of PCR for interference model

Fig. 11. Geometric analysis of nested structures of metasurfaces

Fig. 12. Influence of inner cross width b on PCR

Fig. 13. Influence of structural parameter w on PCR

Fig. 14. Influence of unit structure period p on PCR