Multiple-scattering modeling of long-range surface plasmon polariton bandgap structures

In order to bring down the level of propagation loss of plasmon waves to something which is more favourable for making optical components for telecommunications applications we consider in this paper long-range surface plasmon polariton bandgap (LRSPPBG) structures consisting of a thin gold film (15 nm thickness) with periodically arranged gold nanoparticles attached to both sides of the gold film. The gold film and nanoparticles is surrounded by a polymer (BCB) with refractive index 1.53. The thin gold film actually supports two types of plasmon waves with very different loss properties and different symmetry with respect to the center of the gold film. It is necessary to place gold particles on both sides of the thin gold film to scatter light into only the type of plasmons with low loss. We investigate in this paper the optical/plasmonic properties of LRSPPBG structures with a multiple scattering method.