Abstract
We apply the transfer matrix formalism to study the local optical properties of bimetallic superlattices. We also study the surface modes coupling of the sandwich geometry (three layer system). We calculate the dispersion relation of the collective normal modes of an infinite superlattice and the reflectance of a semi-infinite superlattice for p-polarized light. The results of the dispersion relation show two branches of the surface plasmon-polaritons and the reflectance presents two well defined minima due to the surface modes coupling of the succesive metallic layers. The coupling is strong for thin layers, but becomes weak as the layer thickness becomes large. The reflectance of the sandwich geometry presents two minima which are due to the excitation of the symmetric and antisymm e tric surface plasmon-polaritons. The parameters used here correspond to Al and Mg.
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