Fig. 1. Schematic diagrams of metasurface polarization converter. (a) Three-dimensional view; (b) side view; (c) top view

Fig. 2. Schematic diagram of forward network

Fig. 3. Variation of MSE of forward prediction network with epochs

Fig. 4. Comparison between prediction and simulation results of forward network

Fig. 5. Schematic diagram of tandem neural network

Fig. 6. Variation of MSE of tandem neural network with epochs

Fig. 7. Comparison of target curve (solid line), prediction curve (dashed line) and simulation curve (dot line)

Fig. 8. Reflection spectra and PCR spectra under y-polarized wave incidence. (a) Co-polarized and cross-polarized reflection coefficients at incidence angle of 0°; (b) PCR at incidence angle of 0°; (c) co-polarized and cross-polarized reflection coefficients at incidence angle of 50°; (d) PCR at incidence angle of 50°

Fig. 9. Influence of incident angle on polarization conversion ratio of metasurface

Fig. 10. Surface current distributions at 0.83 THz. (a) Surface current distribution of top metal-patterned layer; (b) surface current distribution of bottom grounding layer; (c) equivalent magnetic moment and induced magnetic field