Resonance of surface-localized plasmons in a system of periodically arranged gold and silver nanowires on a dielectric substrate

In the present study, the interaction of optical radiation with a system of periodically arranged gold and silver nanowires of the square cross-sections on the dielectric substrate has been analyzed. The spectral character of the absorption, reflection and transmission at the interaction of the optical wave with nanogratings based on gold and silver is qualitatively and quantitatively different. It is explained by the fact that the imaginary part of the dielectric constant of gold is much larger than the imaginary part of the dielectric constant of silver in the spectral region of the plasmon resonance. Moreover, the electric fields which appear on the nanowires are considerably higher for silver than for gold.