title: Modeling and analysis of optical properties of a gold nanoring based on electric and magnetic dipoles.
abstract: The optical behavior of a plane-wave excited gold nanoring (NR), originated from localized surface plasmon resonance is modeled by two coupled electric- and magnetic-point dipoles. Considering the extinction cross-section spectrum, it is found that the electric-dipole effect is dominant in comparison with the magnetic-dipole effect although the magnetic-dipole signature is observable in the near-field response of the NR. In addition, the far-field electromagnetic radiation pattern of the NR verifies the corresponding radiation pattern of the point dipoles. The numerical simulation near-field results are in agreement with the proposed electric- and magnetic-dipole theory.
authors.forename: S M R
authors.initials: SM
authors.lastname: Safaee
authors.forename: M
authors.initials: M
authors.lastname: Janipour
authors.forename: M A
authors.initials: MA
authors.lastname: Karami