Fig. 1. Structural diagram of MIM hollow optical fiber

Fig. 2. Transmission spectra of sensor under different inner Ag layer thicknesses

Fig. 3. Transmission spectra of sensor versus outer Ag layer thickness under different liquids to be measured. (a) Refractive index of 1.52; (b) refractive index of 1.37

Fig. 4. Effect of medium layer thickness on sensor performances. (a) Normalized spectra; (b) sensitivity

Fig. 5. Parallel electric field distributions at resonance for different dielectric films with a high refractive index. (a) Thick AgI; (b) thin AgI; (c) COP; (d) SiO2

Fig. 6. Performance comparison among sensors with three kinds of dielectric films with a high refractive index. (a) Normalized spectra; (b) resonance wavelength; (c) sensitivity; (d) FOM

Fig. 7. Parallel electric field distributions at resonance for different dielectric films with a low refractive index. (a) AgI; (b) COP; (c) SiO2

Fig. 8. Performance analysis of sensor with a low refractive index. (a) Normalized spectra; (b) resonance wavelength; (c) sensitivity; (d) FOM

Fig. 9. Performance comparison for sensors in all refractive index range. (a) Sensitivity; (b) FOM