Fig. 1. Diagrams of metasurface unit. (a) Main view; (b) top view

Fig. 2. Amplitude-frequency characteristics of unit. (a) Reflection amplitude; (b) phase difference

Fig. 3. Amplitude-frequency characteristics of RCP wave at different rotation angles for vertical incidence. (a) Reflection amplitude; (b) phase difference

Fig. 4. Four super units. (a) 00; (b) 01; (c) 10; (d) 11

Fig. 5. Flowchart of genetic algorithm

Fig. 6. Array layout and electric-field characteristics. (a) Array layout; (b) diffuse reflection effect; (c) energy diagram; (d) scattergram

Fig. 7. RCSs of different polarized wave under vertical incidence and its reduction. (a) RCS; (b) reduction of RCS

Fig. 8. Scattering directions of right-handed circularly polarized waves and x-polarized waves. (a) Right-handed circularly polarized waves; (b) x-polarized waves; (c)(d) sheet metals

Fig. 9. RCS of linear polarization wave and its reduction. (a) RCS of x polarization wave; (b) reduction of x polarization wave; (c) RCS of y polarization wave ; (d) reduction of y polarization wave

Fig. 10. Scattering directions of linear polarized waves when θ=30° and f=1.2 THz. (a) x polarized waves; (b) y polarized waves; (c)(d) sheet metals

Fig. 11. Flowchart of GS algorithm

Fig. 12. Phase layout. (a) Original drawing; (b) phase recovery diagram; (c) phase plate; (d) phase hologram

Fig. 13. Structural characteristics and holographic imaging. (a) Structural characteristics; (b) hologram imaging result