Birefringent dispersive FDTD subgridding scheme

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De Deckere, B ; Van Londersele, Arne ; De Zutter, Daniël ; Vande Ginste, Dries (2016)

A novel 2D finite difference time domain (FDTD) subgridding method is proposed, only subject to the Courant limit of the coarse grid. By making mu or epsilon 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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