In 2D FDTD, choosing Courant number Sc equal to the relative refractive index nr eliminates numerical dispersion and enables stable simulation of media with nr < 1 and left-handed media.
SeismicmonitoringofCO 2 geosequestration: CO2CRCOtway case study using full 4D FDTD approach.International Journal of Greenhouse Gas Control, 49:201–216, 2016
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Impact of Courant number on the results of numerical simulating of signal propagation in non-dispersive homogeneous media
In 2D FDTD, choosing Courant number Sc equal to the relative refractive index nr eliminates numerical dispersion and enables stable simulation of media with nr < 1 and left-handed media.