Photonics

Photonics

Ansys Insight: Boundary conditions and PML settings in FDE solver

    • Khashayar Ghaffari
      Ansys Employee

      Question 1: What boundary conditions should I use when creating simulation in MODE - FDE Solver? Should I use PML? If yes, what PML parameters should I use?

      Generally, FDE uses metal boundaries by default and that is also what is recommended when starting with a new simulation.

      PML should be used only when there is a good reason for it - for example when you have radiative loss such as in bent waveguide or when you are interested in exact loss parameters. In such situations, the default PML settings should be sufficient in most cases as you do not have to worry about the numerical instability in frequency domain(as opposed to FDTD)

      Here is the default PML settings:

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