Fig. 1. Summary of unit structure. (a) Diagram of the unit; (b) open ring and its top view and side view; (c) cylinder and its top view and side view; (d) square substrate and its top view and side view

Fig. 2. Amplitude and phase coverage when sweeping three parameters of unit structure. (a) Different phases and corresponding unit structures; (b) different amplitudes and corresponding unit structures

Fig. 3. Amplitude coverage and corresponding phase of metasurface unit structure under 1 THz RCP light when only two parameters of the unit structure are adjusted

Fig. 4. Phase coverage and corresponding amplitude of metasurface unit structure under 1 THz RCP light when only two parameters of the unit structure are adjusted

Fig. 5. Schematic of ResNet architecture design process

Fig. 6. Distribution of η_MAE and η_MSE during neural network training when the number of residual blocks is 1. (a) η_MAE; (b) η_MSE

Fig. 7. Distribution of η_MAE and η_MSE during neural network training when the number of residual blocks is 3. (a) η_MAE; (b) η_MSE

Fig. 8. Distribution of η_MAE and η_MSE during neural network training when the number of residual blocks is 4. (a) η_MAE; (b) η_MSE

Fig. 9. Metasurface and its light field distribution. (a) Overall schematic of the metasurface; (b) results under 1 THz RCP light

Fig. 10. 19×19 unit structure of the metasurface and its light field focusing effect. (a) Metasurface schematic; (b) light field manipulation effect on the yoz plane; (c) when z=1200 μm, the light field manipulation effect on the xoy plane