On Mar 12, 2008, at 12:16 PM, shi lina wrote: > I am calculating the transmission of a photonic crystal > slab. My system is similar as Fan's article (PRB 65, 235112, > analysis of guided resonances in photonic crystal slabs). The > computational cell is large and time-consuming. I want to exploit > the symmetry to speed up the computation. I have read the meep > manual about symmetry. The square lattice has mirror symmetry about > x, y axes, 90 degree rotaitional symmetry. But the source is Ey or > Ex, I am confused by these. I don't know how to set the symmetry. > Could you suggest me about this? Thank you very much!
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)))) (That is, the "phase", even or odd, of the mirror symmetry, only refers to the symmetry of the source. For experts, I should say that it specifies which irreducible representation of the symmetry group your sources/fields transform as.) Regards, Steven G. Johnson _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
