Fig. 1. Schematic of metamaterial. (a) Incidence of electromagnetic waves; (b) 3D unit structure; (c) cross section

Fig. 2. EIT effect in metamaterials with different electrical conductivities. (a)(c) Complete structures; b) structure without external CSRR; (d) structure without internal CSRR

Fig. 3. Electromagnetic field distribution of metamaterial. (a)(c) σ=0, f=1.47 THz; (b)(d) σ=106 S/m, f=0.7 THz

Fig. 4. Electromagnetic response of split cell structure. (a) Resonant response of PCCL; (b) resonant response of complete and part of CSRRs; (c) EIT effect of complete structure for σ=0; (d) EIT effect of complete structure for σ=106 S/m; (e) electromagnetic field distributions in various decomposed structures

Fig. 5. Electromagnetic field distributions at the edge of metamaterial. (a) σ=0, f=1.47 THz; (b) σ=106 S/m, f=0.7 THz

Fig. 6. Influence of GaAs width on EIT effect under different electrical conductivities. (a) σ=0; (b) σ=106 S/m

Fig. 7. Influence of CSRR opening distance on EIT effect under different electrical conductivities. (a) σ=0; (b) σ=106 S/m

Fig. 8. Influence of substrate thickness on EIT effect under different electrical conductivities. a) σ=0; (b) σ=106 S/m

Fig. 9. S parameter and group index versus frequency. (a) S parameter versus frequency for σ=0; (b) refractive index and group index versus frequency for σ=0; (c) S parameter versus frequency for σ=106 S/m; (d) refractive index and group index versus frequency for σ=106 S/m

Fig. 10. Sensitivity of metamaterial to variation of refractive index. (a) EIT curves of materials with different refractive indexes for σ=0; (b) refractive index sensitivity for σ=0; (c) EIT curves of materials with different refractive indexes for σ=106 S/m; (d) refractive index sensitivity for σ=106 S/m