Fig. 1. Schematic of refractive index sensor based on composite structure of dielectric grating with metal films

Fig. 2. (a) Reflection spectra and (b) their corresponding enlarged partial views under different grating thicknesses when analyte refractive index is 1.3317 and grating period is 300 nm

Fig. 3. Reflection spectra under different grating periods when analyte refractive index is 1.3317 and grating thickness is 100 nm

Fig. 4. Reflection spectra of analytes with different refractive indexes

Fig. 5. Electric-field distributions of metal films under different resonance angles. (a) Interface between metal films and analyte; (b) interface between metal films and grating