Fig. 1. Schematic diagram of complete structure

Fig. 2. Transmission spectra of individual structures and entire system. (a) Transmission spectra of individual different types of resonant cavities or single baffle; (b) transmission spectrum of system structure

Fig. 3. Magnetic field maps corresponding to peak values of system transmittance. (a) 650 nm; (b) 985 nm; (c) 1275 nm

Fig. 4. Effect of different notched ring cavity radii R on transmittance and FOM. (a) Transmission spectra corresponding to varying value of single parameter R; (b) values of FOM corresponding to varying value of single parameter R

Fig. 5. Effect of different notched ring cavity angles θ on transmittance and FOM. (a) Transmission spectra corresponding to varying value of single parameter θ; (b) values of FOM corresponding to varying value of single parameter θ

Fig. 6. Effect of different octagonal cavity side lengths S on transmittance and FOM. (a) Transmission spectra corresponding to varying values of single parameter S; (b) values of FOM corresponding to varying value of single parameter S

Fig. 7. Changes in transmission and sensitivity with varying refractive index. (a) Effect of refractive index variation on transmission spectra; (b) sensitivities corresponding to peak transmission after refractive index variation

Fig. 8. Relationship between value of FOM and wavelength of system with optimal parameters of structure