Fig. 5.

Effect of Periodicity ‘P’ of silver narrow groove plasmonic nano-grating structure on reflection spectra from the nano-gratings for different filling factors ‘FF’ of the nano-gratings: (a) 0.05, (b) 0.06, (c) 0.07, (d) 0.08, (e) 0.10, (f) 0.14, (g) 0.2, and (h) 0.3. In the calculations, the localized refractive index around the silver nano-gratings was taken as 1.53 (n=1.53 for 1 nm above the metallic film, the remaining region having n=1.33) and height ‘H’ was 100 nm.