Modelling Surface Plasmon Resonance on Nanorods

Hi.

I am trying to model single gold nanorods of different size and shape extruding out of a thin gold layer with visible wavelength light incident upon it. The aim of this is to see how the geometry and wavelength affects the the surface plasmon resonance created. Could anyone please give me an idea where to start or point me towards any similar work / useful tutorials? Im new to Comsol so as detailed as possible would be appreciated.

Thanks in Advance
Josh