We compute the radiative decay rate and the quantum efficiency
for an emitter coupled to gold nanorods and nanospheroids using the bodyof-
revolution finite-difference time-domain method. We study these quantities
as a function of the nanoparticle aspect ratio and volume, showing that large
enhancements can be achieved with realistic parameters. Moreover, we find that
nanospheroids exhibit better performances than nanorods for applications in the
visible and near-infrared spectral range.