Re: Point defects in slab structure - resonant frequencies

Steven,
Thank you for the help.  I had a few other quick things I am having trouble with:

1. I added statements for compute-energy-in-objects, but found most of the
percentages were low (the highest was 15%).  When I looked at the Hz field
patterns (I am using a hexagaonal lattice of air holes in Si, r/a = 0.3, h/a =
0.6) at z=0 output using h5topng expanded for a couple of periods, I do not see
field localization in the center defect, but do see field localization in the
expanded periodic copies of the defect.  Please see:
http://img235.imageshack.us/img235/8948/b75ap1.jpg
Is there a physical reason why the periodic copies of the supercell and its
defect seem to have field localization, but not the center one?  Does this
explain why my compute-energy-in-objects percentages are low for a cylinder
object placed at the center of the simulation area?

2. For a 2D point defect, the resonant frequency should be equal at all k
points.  Should this hold for slab structures?  When I plot all of the bands in
the gap at once for a slab structure, one can visually see flat bands, but when
I plot individual bands, the frequencies seem to vary with k.  

I really appreciate the help given to questions such as this and for MPB and
MEEP in general.  
Thank you
Rob