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  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.4   pp.725-732
Publication Date: 2012/04/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.725
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Theory
Keyword: 
alternating-direction implicit (ADI),  Drude-critical point model,  locally one-dimensional (LOD),  plasma wave,  trapezoidal recursive convolution (TRC) technique,  

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Summary: 
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.