Fig. 1. Schematic diagram of metasurface

Fig. 2. Variation curves of transmission coefficient of unit structure with incident frequency under two conductivities

Fig. 3. Surface current distribution of metasurface structure under different illumination conditions

Fig. 4. Transmission amplitude and phase of unit structure at different rotation angles

Fig. 5. Simulated transmission electric field distribution under different illumination conditions

Fig. 6. Proposed model of metalens and its characteristics

Fig. 7. Vortex beam characteristics under different conditions