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Dear Taynara,
I don’t understand exactly the geometry used. The excitation side is:
and the output port is:
Is this correct? In the last photo where is the top silica, polymer, polymer cladding and side Si slabs? Why are the y and z spans different?
Another option that can affect the result is the number of modes in each cell. If you choose a mode that is not one of the first modes, you must ensure that this mode (the one that is really close to this one as the structure gradually changes) will be also found in the rest of the cells. To ensure that, you can either use many modes in the cells which will increase the simulation time, or use custom modes for each group:
Best regards,
Afroditi