Abstract

We show that the performance of iterative solvers of the frequency-domain Maxwell's equations is greatly affected by the kind of the perfectly matched layer (PML) used. In particular, we demonstrate that using the stretchedcoordinate PML (SC-PML) results in significantly faster convergence speed as compared with using the uniaxial PML (UPML). Such a difference in convergence behavior is explained by an analysis of the condition number of the coefficient matrices. Additionally, we develop a diagonal preconditioning scheme that significantly improves solver performance when UPML is used.

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