Fig. 1. The proposed structural model

Fig. 2. Fano resonance formation process

Fig. 3. The magnetic field distribution of the two Fano resonances at the peak and valley

Fig. 4. The electric field distribution of the two Fano resonances at the peak and valley

Fig. 5. Influence of different circle radius R on transmittance and FOM

Fig. 6. Influence of different side length a on transmittance and FOM

Fig. 7. Influence of different resolution distance k on transmittance and FOM

Fig. 8. Influence of different coupling distance g on transmittance and FOM

Fig. 9. System sensing performance characteristics