Birefringent dispersive FDTD subgridding scheme
De Deckere, B
Van Londersele, Arne
De Zutter, Daniël
Vande Ginste, Dries
Technology and Engineering | IBCN
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.