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January 31, 2019 at 8:55 am
#50424
Malik,
You make the design, you know the location of the waveguide so set the center of the source to match the location of your waveguide. For width, either use a rectangular field larger than the waveguide or perhaps a Gaussian that is roughly the size of the waveguide. Again you built the design and therefore know that the waveguide is roughly the width of the lattice constant.
Scott