Fig. 1. Structural drawings of metamaterial. (a) 3D view; (b) front view; (c) upward view

Fig. 2. EIT effect produced by three kinds of structures

Fig. 3. Electric and magnetic fields. (a) Electric field at 0.68 THz; (b) electric field at 1.09 THz; (c) magnetic field at 0.68 THz; (d) magnetic fields at 1.09 THz

Fig. 4. (a) EIT effect of reverse double SRR; (b) EIT effect of forward single SRR; (c) distributions of electromagnetic fields of various decomposed structures

Fig. 5. Relationship between the bandwidth of the transmission peak and the difference of resonance frequencies

Fig. 6. Effect of distance between the SRRs on EIT effect

Fig. 7. Effect of the arm-length of SRRs on EIT effect

Fig. 8. Variations of (a) parameter S, (b) refractive index and group index with frequency

Fig. 9. (a) EIT curves at different refractive indices and (b) refractive index sensitivity for three frequency band