Abstract: Properties of the attenuated reflection and the SPR field distributions of both metallic gratings and dielectric gratings placed on metal films were analyzed by using the rigorous coupled wave analysis. The relations between the gratings' filling factors and the effective index( ) of the surface plasmon polaritons(SPPs) propagating on both structures were investigated. The results show that the increase of filling factor can only cause trivial changes to of the SPPs on gold gratings, but distinct increments to that of the dielectric gratings.

Key words: medical optics and biotechnology, grating, RCWA, surface plasmon polariton