Abstract

A self-consistent analytical approach was developed to describe the optical properties of an assembly of magneto-plasmonic composite nanoparticles distributed on a dielectric substrate. The proposed theory is based on the effective susceptibility concept in the frame of Green’s function method and accounts for the local-field effects in the system. The analytical expressions for effective susceptibility of a single particle, as well as for assemblies of particles, on the substrate were derived to treat the scattered electromagnetic field by an assembly of composite nanoparticles. The developed formalism was applied to describe the polar Kerr effect in the Au/Co-based magneto-plasmonic system. The results of the simulation suggest that the magneto-optical properties of the considered magneto-plasmonic composite are determined by the interplay between “particle–particle” and “particle–surface” interactions, which are mainly given by the geometry of the particles, their concentration, and the optical properties of the substrate.

© 2010 Optical Society of America

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