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Based on the coupled-dipole analysis and finite-difference time-domainsimulation, we have investigated the surface plasmon propagation inone-dimensional metallic nanoparticle (NP) chains. Our systematic studiesreveal that the interplay between the localized plasmon excitation and thelattice collective behavior leads to two phases (I and II) of differentelectromagnetic (EM) field transport properties. In phase I, the EM fielddecays follow the power-law. In phase II, the EM field shows the exponentialdecay in the short distance regime and the power-law decay in the long distanceregime. Moreover, universal power-law exponents have been found in the longpropagation distance. The two different EM field propagation behaviors can betransformed to each other by tuning the parameters of the excitation fieldsand/or those of the NP chains. The EM field transport mechanisms we have foundare very useful in the design of plasmonic waveguide with both strong fieldconfinement and efficient field/energy transfer, which has importantapplications in integrated nanophotonic circuits.

Power-law/exponential transport of electromagnetic field in one-dimensional metallic nanoparticle arrays