Thank you very much for your answer and reproducing my simulation.
You wrote that a plane wave source should not be used to inject a mode into a slab waveguide. My follow-up questions are:
How would you recommend to inject a mode into a slab waveguide with Bloch periodic boundary conditions? To the best of my knowledge, the mode source does not support Bloch boundary conditions.
If it is not possible to perform a simulation as described above, how would you set up a simulation to measure the transmission through an (infinitely) wide waveguide slab containing a height discontinuity?
I am looking forward to your thoughts.
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