Abstract
A generalized auxiliary differential equation (ADE) finite-difference
time-domain (FDTD) dispersive scheme is introduced for the rigorous simulation
of wave propagation in metallic structures at optical frequencies, where material
dispersion is described via an arbitrary number of Drude and critical point
terms. The implementation of an efficient perfectly matched layer for the
termination of such media is also discussed and demonstrated. The model's
validity is directly compared with both analytical and numerical results that
employ known dispersion schemes, for the case of two benchmark examples, transmission
through a thin metal film and scattering from a metallic nanocylinder. Furthermore,
the accuracy of the proposed method is also demonstrated in the study of the
optical properties of Ag and Au metal-insulator-metal waveguides, filters,
and resonators, which also involve dielectrics whose material dispersion is
described by the Sellmeier model.
© 2013 IEEE
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