Dear Steven,
"An Ey source at the origin has even mirror symmetry in x and odd
mirror symmetry in y. So, since your structure is also mirror-
symmetric in x and y, you would exploit this as:
(set! symmetries (list (make mirror-sym (direction X)) (make mirror-
sym (direction Y) (phase -1))))"
So if I calculate the transmission and the source locates above the photonic
crystal slab (not at the origin), I can't use mirror symmetry?
Yours Sincerely,
Lina
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