Hi Amrita,
Here's the transmission box. It looks the same as the one from dipolepower (and the transmission box I have placed arroud the entire photonic crystal instead of only arround the source).
An additional note which could be important, I remember in a simulation where I used standard boundary condition with 8 PML layer, my simulations diverged, which I think could've been due to PML reflections (in movie I saw fields appearing after a long time as leakage probably from the PML). Could this be playing a role since my simulation region is narrow and/or my absorption in PML is not high enough (value same as stabilized)?
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