Fig. 1. The structure of the proposed all-dielectric metasurface. (a) Front view; (b) Top view; (c) Port setting

Fig. 2. Transmission spectra under different polarization incidence. (a) x-polarization; (b) y-polarization

Fig. 3. The transmission spectra under different Δw

Fig. 4. The result of multipole decomposition under Δw = 1 μm

Fig. 5. Displacement current density, magnetic field distribution and electric field distribution at 1.6922 THz and 1.7611 THz. (a) The displacement current density at 1.6922 THz; (b) The electric field distribution at 1.6922 THz; (c) The magnetic field distribution at 1.6922 THz; (d) The displacement current density at 1.7611 THz; (e) The electric field distribution at 1.7611 THz; (f) The magnetic field distribution at 1.7611 THz

Fig. 6. Transmission spectra under different structural parameters. (a) Substrate size P_x; (b) Rectangular block height H; (c) Rectangular block spacing g; (d) Rectangular block side length w

Fig. 7. Transmission spectra obtained under different refractive index losses

Fig. 8. The relationship between the Q value and the Δw

Fig. 9. The equivalent parameters of the proposed metasurface. (a) Refractive index; (b) Equivalent impedance; (c) Relative permeability; (d) Relative dielectric constant