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RCWA calculations showing the effect of nano-grating groove width ‘W’ on the plasmon resonance dips in the reflectance spectra for narrow groove metallic nano-gratings: (a) Gold nano-grating, and (b) Silver nano-grating. The nano-grating height ‘H’ and periodicity ‘P’ are 100 nm and the refractive index of the medium surrounding the nano-grating was 1.33.
