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Abstract

We study the fundamental optical effects originating from the resonant
excitation of localized and delocalized surface plasmon modes supported
by a multilayer metallic photonic crystal slab. The optimized model
system consists of a periodic gold nanowire array and a spatially
separated homogeneous silver film. We show that the spacer layer
controlled dipole-surface interaction reveals a pronounced period
dependence when an ordered nanowire arrangement is employed. Our
analysis demonstrates that strong coupling gives rise to the formation
of hybridized plasmon modes. Moreover, the magnetic activity of the
metallic multilayer structure is theoretically analyzed. The presented
effects provide interesting tools for the optimization of future
plasmonic nanodevices and metal-based metamaterials.