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We have investigated the plasmonic enhancement of the radiation field atvarious nanostructured multilayer devices, that may be applied in surfaceenhanced Raman spectroscopy. We apply an image dipole method to describe theeffect of surface morphology on the field enhancement in a quasistatic limit.In particular, we compare the performance of a nanostructured silver surfaceand a layered silver-gold hybrid device. It is found that localized surfaceplasmon states (LSP) provide a high field enhancement in silver-gold hybriddevices, where symmetry breaking due to surface-defects is a supporting factor.These results are compared to those obtained for multi-shell nanoparticles ofspherical symmetry. Calculated enhancement factors are discussed on thebackground of recent experimental data.

Image dipoles approach to the local field enhancement in nanostructured Ag-Au hybrid devices