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Abstract
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We have extended the contour-path effective-permittivity
(CP-EP) finite-difference time-domain (FDTD) algorithm by A. Mohammadi
et al., Opt. Express 13, 10367 (2005), to linear dispersive materials
using the Z-transform formalism. We test our method against staircasing
and the exact solution for plasmon spectra of metal nanoparticles. We
show that the dispersive contour-path (DCP) approach yields better results
than staircasing, especially for the cancellation of spurious resonances.
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