Frequency-Dependent Formulations of a Drude-Critical Points Model for Explicit and Implicit FDTD Methods Using the Trapezoidal RC Technique

Jun SHIBAYAMA; Keisuke WATANABE; Ryoji ANDO; Junji YAMAUCHI; Hisamatsu NAKANO

doi:10.1587/transele.E95.C.725

Regular Section

Frequency-Dependent Formulations of a Drude-Critical Points Model for Explicit and Implicit FDTD Methods Using the Trapezoidal RC Technique

Jun SHIBAYAMA, Keisuke WATANABE, Ryoji ANDO, Junji YAMAUCHI, Hisamatsu NAKANO

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Keywords: alternating-direction implicit (ADI), Drude-critical point model, locally one-dimensional (LOD), plasma wave, trapezoidal recursive convolution (TRC) technique

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2012 Volume E95.C Issue 4 Pages 725-732

DOI https://doi.org/10.1587/transele.E95.C.725

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Abstract

A Drude-critical points (D-CP) model for considering metal dispersion is newly incorporated into the frequency-dependent FDTD method using the simple trapezoidal recursive convolution (TRC) technique. Numerical accuracy is investigated through the analysis of pulse propagation in a metal (aluminum) cladding waveguide. The TRC technique with a single convolution integral is found to provide higher accuracy, when compared with the recursive convolution counterpart. The methodology is also extended to the unconditionally stable FDTD based on the locally one-dimensional scheme for efficient frequency-dependent calculations.

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