Fig. 1. Structural diagram of PCN-PCSNC

Fig. 2. Transmission spectrum and electric field distribution of Fano resonance. (a) Transmission spectra of Wg-PCSNC and PCN, illustration is fitted diagram of transmission spectrum of PCN-PCSNC and Fano formula; (b) electric field distribution of PCN-PCSNC at resonant wavelength

Fig. 3. Simplified diagram of PCN-PCSNC model

Fig. 4. Transmission spectra and resonant wavelengths of PCN-PCSNC under different n. (a) Transmission spectra; (b) resonant wavelengths

Fig. 5. Relationship between F_om of PCN-PCSNC and wavelength

Fig. 6. Influence of a₁ on sensing characteristics. (a) Transmission spectra of PCN-PCSNC under different a₁; (b) S and F_om of PCN-PCSNC varying with a₁

Fig. 7. Influence of r₁ on sensing characteristics. (a) Transmission spectra of PCN-PCSNC under different r₁; (b) S and F_om of PCN-PCSNC varying with r₁

Fig. 8. Influence of w_slot on sensing characteristics. (a) Transmission spectra of PCN-PCSNC under different w_slot; (b) S and F_om of PCN-PCSNC varying with w_slot

Fig. 9. Influence of g on sensing characteristics. (a) Transmission spectra of PCN-PCSNC under different g; (b) S and F_om of PCN-PCSNC varying with g

Fig. 10. Sensitivity variation for deviations of tapered hole aperture and slot width within 10 nm