Fig. 1. Metamaterial terahertz broadband reflector with double grid metal. (a) Structure diagram; (b) its front view

Fig. 2. S₁₁、S₂₁ curves of double layer grid-shaped metamaterial terahertz reflector. (a) TM polarization state; (b) TE polarization state

Fig. 3. Surface current distribution of double-layer grid-shaped metamaterial reflector in TE polarization state

Fig. 4. Simulation results of S₁₁ spectra in different polarization states. (a) TM polarization state; (b) TE polarization state

Fig. 5. Surface current diagrams of metamaterial reflector in TE polarization state. (a) Single-layer grid-shaped metamaterial reflector; (b) double-layer grid-shaped metamaterial reflector

Fig. 6. Reflected electric field diagrams of metamaterial reflector in TE polarization state. (a) Single-layer grid-shaped metamaterial reflector; (b) double-layer grid-shaped metamaterial reflector

Fig. 7. Effect of different metal layers on S₁₁in TE polarization state

Fig. 8. S₁₁ versus thickness of intermediate layer in different polarization states. (a) TM polarization state; (b) TE polarization state

Fig. 9. S₁₁ versus length of grid period in different polarization states. (a) TM polarization state; (b) TE polarization state

Fig. 10. S₁₁ versus grid width in different polarization states. (a) TM polarization state; (b) TE polarization state

Fig. 11. Effect of changing grid length on S₁₁ in TE polarization state

Fig. 12. Influence of incident angle on S₁₁ in TE polarization state

Fig. 13. Influence of incident angle on S₁₁ in TM polarization state