A simple, approximate theoretical model of surface plasmon resonance in two-dimensional metal nanoshells is developed. The model is based on the concept of short-range surface plasmons propagating around closed circular metal nanotubes. In this model, the plasmon resonance in a metal nanotube is treated as a propagating, self-interfering plasmonic wave, in a ring-type resonance, at plasmonic wavelengths matching an integer fraction of the nanotube’s effective circumference. The model is validated by detailed computer simulations based on the finite-difference time-domain method and is shown to be in full agreement with the widely used plasmon hybridization model, which is based on the quasi-static approximation.
© 2011 Optical Society of America
Optics at Surfaces
Original Manuscript: May 6, 2011
Revised Manuscript: July 6, 2011
Manuscript Accepted: July 6, 2011
Published: September 30, 2011
Boris Apter, Oren Guilatt, and Uzi Efron, "Ring-type plasmon resonance in metallic nanoshells," Appl. Opt. 50, 5457-5464 (2011)