Fig. 1. Structural diagram of PCN side-coupling aperture chirped PCNC

Fig. 2. Diagrams of structure and simplified model. (a) Diagram of Fano resonance structure; (b) simplified diagram of theoretical model

Fig. 3. Diagrams of Fano resonance line and field distribution. (a) Fano resonance line; (b) electromagnetic field distribution at the trough; (c) electromagnetic field distribution at the peak

Fig. 4. F_OM values corresponding to Fano resonances at different wavelengths

Fig. 5. Effect of r on sensor performance. (a) Effect of r on Fano resonance; (b) effect of r on F_OM value; (c) effect of r on sensitivity

Fig. 6. Effect of a on sensor performance. (a) Effect of a on Fano resonance; (b) effect of a on F_OM value; (c) effect of a on sensitivity

Fig. 7. Effect of g on sensor performance. (a) Effect of g on Fano resonance; (b) effect of g on F_OM value; (c) effect of g on sensitivity

Fig. 8. Comparison of F_OM values of three structures

Fig. 9. Influence of refractive index n on sensing characteristics. (a) Influence of refractive index n on Fano resonance peak; (b) fitting curve of relationship between refractive index n and resonant wavelength