Reply To: MODE: Strange mode result from FDE solver

[Amrita Pati]

Hi Henrick,

Thanks for confirming! 

I am running this simulation on a computational server of my university. I was wondering if this behaviour could be caused by the computational resource management of Lumerical and the server. 

I don't think that should happen. 

It could be a bug. I will check internally to see if there have been any bug fixes since 2024 R1.1 and let you know. I will recommend you to uncheck the "use max index" (just below "search near n"). Then in the next field "n", try setting it's value to 2.18 (close to the correct mode's). Then run the simulation multiple times to see if you still see these strange modes in some of the runs.

Secondly, for the background mesh, try using fewer mesh cells, you may try the following:

Increasing the width of the background mesh makes the PML thicker and can increase it's performance.

It still puzzling to me why this strange behavior would appear only for some of your runs. I will look at this in a bit more detail and come back.

Regards,
Amrita