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Birefringent dispersive FDTD subgridding scheme

Birefringent dispersive FDTD subgridding scheme

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A novel 2D finite difference time domain (FDTD) subgridding method is proposed, only subject to the Courant limit of the coarse grid. By making μ or ε inside the subgrid dispersive, unconditional stability is induced at the cost of a sparse, implicit set of update equations. By only adding dispersion along preferential directions, it is possible to dramatically reduce the rank of the matrix equation that needs to be solved.

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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2016.1709
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