Fig. 1. Three-dimensional structure diagram of dielectric grating-metal Ag thin films-periodic photonic crystal hybrid structure

Fig. 2. Reflectance spectra and magnetic field distribution. (a) Reflection spectra; (b) phase; (c) magnetic field distribution at the dip of reflection curve; (d) magnetic field distribution at the peak of reflection curve

Fig. 3. Effect of period number N on sensing performance. (a) Three-dimensional diagram of reflection spectrum curves; (b) effect of periodic number N on FOM value; (c) two-dimensional diagram of reflection spectrum curves

Fig. 4. Effect of grating period Λ on sensing performance. (a) Three-dimensional diagram of reflection spectrum curves; (b) two-dimensional diagram of reflection spectrum curves; (c) fitting curve of grating period Λ and incident angle θ; (d) effect of grating period Λ on FOM value

Fig. 5. Effect of metal Ag thin film thickness d₀ on sensing performance. (a) Three-dimensional diagram of reflection spectrum curves; (b) two-dimensional diagram of reflection spectrum curves; (c) fitting curve of thickness d₀ and incident angle θ; (d) effect of thickness d₀ on FOM value

Fig. 6. Effect of refractive index n_s on sensing performance. (a) Effect of refractive index n_s on Fano resonance curves; (b) fitting curve of refractive index n_s and incident angle θ