The current PML profiles are appropriate e.g. for a finite difference grid, and result in sharp features at the edges of the unit cells, likely leading to ringing and perturbations to the permittivity even in the non-PML region. We should investigate this issue and consider better (smoother) spatial profiles for the PML.
The current PML profiles are appropriate e.g. for a finite difference grid, and result in sharp features at the edges of the unit cells, likely leading to ringing and perturbations to the permittivity even in the non-PML region. We should investigate this issue and consider better (smoother) spatial profiles for the PML.