Hi Amrita,
thank you for your fast response. I am already using PML boundaries. Here is a screenshot of my geometry.
I am considering a fully-etched Lithiumniobate waveguide on a SO2 substrate and with a SO2 top layer. On the right part of my screenshot you can see the setup script for this geometry. On the left part the geometry settings of the FDE solver are shown. For the FDE solver I chose the “2D X normal” setting with yspan = 4 * waveguide top width and zspan = 3 * waveguide height. The mesh is defined by a maximum mesh step of 20nm in both y- and z-direction.
When enlarging the YZ view, sometimes a small gap appears and disappears that shouldn't be there. Is that what you mean? I attributed this just to the discrete display. Since when meshing the structure before running the simulation, no such gap appears:
The strange thing is, that this simulation setup without changing anything runs sometimes also correctly.
Best regards,
Henrick
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