Fig. 1. Schematic diagram of coding metasurface

Fig. 2. Unit structure, transmission amplitude and phase shift diagrams of metasurface

Fig. 3. Cross polarized transmission phase and transmission coefficient of eight unit structures under the vertical incidence of

Fig. 4. Cross-polarized transmission phase and transmission coefficient of eight unit structures under the vertical incidence of right-circularly polarized light

Fig. 5. 3D scattering mode and 2D scattering mode for the coding metasurface sequence 00224466…

Fig. 6. The near field distributions for the coding metasurface sequence 00224466…

Fig. 7. Transmission and scattering characteristics of 3-bit and 2-bit coding sequences of the metasurface

Fig. 8. The far-field scattering for the basic sequences S₁₁ and S₁₂ of the metasurface and the sequence S₁₃ obtained by convolution calculation

Fig. 9. Far field scattering of coding sequences S₁₀, S₁₁ and S₁₄

Fig. 10. Far field scattering of coding sequences S₁₃, S₁₄ and S₁₅

Fig. 11. Phase plate diagram of vortex beam generation

Fig. 12. Vortex beam for l=1 at Z=-800 μm

Fig. 13. Vortex beam for l=2 at Z=-500 μm