Fig. 1. Structural diagram of unit cell of symmetric cross-shaped cavity metamaterial

Fig. 2. Transmission spectrum of symmetric cross-shaped cavity metamaterial

Fig. 3. Structural diagram of unit cell of asymmetric cross-shaped cavity metamaterial

Fig. 4. Transmission spectra of cross-shaped cavity metamaterial

Fig. 5. Transmission spectra of metamaterial for different S₁

Fig. 6. Transmissivity and quality factor at EIT transmission peak versus S₁

Fig. 7. Regulation of metamaterial geometry on transmission spectrum when S₁=10 nm. (a) g; (b) f; (c) e; (d) h₁

Fig. 8. Electric field distribution in x-y plane at resonant frequency of 329.9 THz when S₂=10 nm and S₁=0

Fig. 9. Electric field distribution in x-y plane at EIT transmission peak frequency of 329.82 THz when S₁=10 nm and S₂=0

Fig. 10. Transmission spectra of metamaterial under different background refractive indexes

Fig. 11. Unusual responses of metamaterial under EIT resonance. (a) Phase; (b) group refractive index