Figure 2.

Investigation of the sensing performance of the discussed structure. (a) Reflection spectra of the layered structure with different refractive indexes (RIs); (b) linear response of the resonant wavelength (blue line) and the figure of merit (green line) at the first plasmon resonance for the designed layered structure. Reflection spectra corresponding to (c) the square nanostructure and (e) the honeycomb-like nanostructure at various RIs. Responses of resonant wavelengths on different RIs for (d) the square nanodisk array and (f) the honeycomb-like nanodisk array; (g) comparison of the figure of merits with various RIs for the square nanodisk array and the honeycomb-like nanodisk array.