Guided surface-volume plasmon modes in an ultrathin film at Drude damping limit

We theoretically demonstrate the existence of surface-volume plasmon modes in an ultrathin film at Drude damping limit and the direct optical excitation of the modes. Unlike volume plasmons of longitudinal nature and confinement in the film, the surface-volume plasmon modes have considerable transverse components localized along the surface of the thin film. The transverse component provides an interface with electromagnetic radiation, which allows excitation by localized optical sources. The surface-volume plasmon modes have extreme field confinement and can propagate around sharp corners with little distortion and loss.