Abstract
A novel unconditionally stable split-step finite-difference time domain (SS-FDTD) method based on an isotropic dispersion finite-difference scheme is introduced. The proposed method reformed the weighting factor and scaling factor of the isotropic-dispersion FDTD for the SS-FDTD method with four substeps, which can generate nearly exact phase velocity for a single frequency. Compared with the conventional four-stage split-step FDTD method, the numerical dispersion error of the new method is significantly reduced even for a large stability factor. The new method is validated by numerical simulations.
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