On Apr 10, 2014, at 8:20 AM, Maarten Dobbelaar <m.c.f.dobbel...@students.uu.nl> wrote: > Together with two colleagues I am studying a 2D chirped photonic crystal and > we are interested in the TM-modes. We have excited our system with a E_z > source and found the localized modes we were looking for (!). The crystal has > mirror planes in both, say, the x- and y-direction. Symmetric modes we could > easily excite selectively by placing the source on one or both ax(i/e)s. > Is there a (un)similar 'trick', to do this for the anti-symmetric ones?
Sure, you just create an anti-symmetric source. For example, suppose you want a TM-polarized mode that is odd with respect to the x=0 plane. There are infinitely many possibilities, for example: a) Place an Ez source with amplitude=+1 at x=1 and another Ez source with amplitude=-1 at x=-1. b) Place a single Hy point source at x=0. (This is antisymmetric because magnetic currents are pseudovectors: http://ab-initio.mit.edu/wiki/index.php/Exploiting_symmetry_in_Meep)
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