Try removing the mirror symmetry and see if that helps. In order to apply the mirror symmetry, Meep needs the computational cell size to have an even number of pixels in that direction; if there are an odd number then it pads the cell size by one pixel in that direction (and prints a message to the output).
Because your cell size in the x direction is irrational, then depending on the resolution you may get an even or odd number of pixels in that direction, and in the latter case it may add a pixel. However, that will make the cell size slightly bigger than your source, which will slightly distort the planewave. Steven _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
