Reply To: MODE: Strange mode result from FDE solver

[Amrita Pati]

Hi Henrick,

It looks like some strange modal interaction is going on with the simulation boundaries. Would you be able to share a screenshot of the simulation geometry? Sometimes if there is a gap between the boundaries and geometry (by geometry I mean substrate/superstarte here, I can't tell if there is one or if this is just a waveguide surrounded by the background material), it creates an artificial cavity which can result in these unphysical modes. I would also be interested to know what BCs are you using? Metal or PML? If you are using metal, try switching to PML and rerun the simulation.

Regards,
Amrita