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Near‐field–induced tunability of surface plasmon polaritons in composite metallic nanostructures

We numerically study near‐field–induced coupling effects in metal nanowire‐based composite nanostructures. Our multi‐layer system is composed of individual gold nanowires supporting localized particle plasmons at optical wavelengths, and a spatially separated homogeneous silver slab supporting delocalized surface plasmons. We show that the localized plasmon modes of the composite structure, forming so‐called magnetic atoms, can be controlled over a large spectral range by changing the thickness of the nearby metal slab. The optical response of single‐wire and array‐based metallic structures are compared. Spectral shifts due to wire–mirror interaction as well as the coupling between localized and delocalized surface plasmon modes in a magnetic photonic crystal are demonstrated. The presented effects are important for the optimization of metal‐based nanodevices and may lead to the realization of metamaterials with novel plasmonic functionalities.