Fig. 1. Schematic of structure of EIT-like metamaterial. (a) Three-dimensional diagram; (b) front view

Fig. 2. Transmission spectra of cross structure, 4L structure and complete structure

Fig. 3. Electric field intensity and surface current distribution of EIT-like metamaterials at resonant frequencies. (a) Electric field intensity distribution at 1.75 THz; (b) electric field intensity distribution at 1.94 THz; (c) electric field intensity distribution at 2.18 THz; (d) surface current distribution at 1.75 THz; (e) surface current distribution at 1.94 THz; (f) surface current distribution at 2.18 THz

Fig. 4. Transmission spectra of 4L resonant element and complete metamaterial structure at different l values. (a) Transmission spectra of 4L resonant element; (b) transmission spectra of complete metamaterial structure

Fig. 5. Transmission spectra of cross resonant element and complete metamaterial structure at different L values. (a) Transmission spectra of cross resonant element; (b) transmission spectra of complete metamaterial structure

Fig. 6. Transmission spectra at different distances and electric field intensity distribution at transmission peak. (a) Transmission spectra; (b) electric field intensity distribution at transmission peak

Fig. 7. Transmission spectra of EIT-like metamaterial structure at different Fermi levels

Fig. 8. Transmission spectra of EIT-like metamaterial structures with TE polarization and TM polarization

Fig. 9. Transmission spectra at different incidence angles. (a) TE polarization; (b) TM polarization

Fig. 10. Phase change and group delay of different Fermi levels. (a) Phase change; (b) group delay

Fig. 11. Transmission spectra and refractive index sensitivity of EIT-like metamaterial under different refractive indexes. (a) Transmission spectra under different refractive indices; (b) refractive index sensitivity at different Fermi levels

Table 1. Polarization insensitivity of different metamaterial structures

Table 2. Comparison of sensitivity of other EIT-like metamaterials and EIT-like metamaterials studied in this paper