access icon free Birefringent dispersive FDTD subgridding scheme

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.

Inspec keywords: finite difference time-domain analysis; dispersion relations; matrix algebra; birefringence

Other keywords: coarse grid; matrix equation; finite-difference time-domain; Courant limit; birefringent dispersive FDTD subgridding scheme; update equation

Subjects: Numerical approximation and analysis; Algebra; Other numerical methods; Algebra; Other numerical methods; Algebra; Algebra, set theory, and graph theory; Numerical analysis

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