On Mon, 16 Oct 2006, Rob Engelen wrote:
Take a look at the attached image, or run the script and look at the
geometry. The outer most cilinder is somehow truncated, and if I try to place
an object even further away from the center, it doesn't appear at all. Is
this a bug, or is it me?
It looks like you are getting confused regarding the coordinate system;
your structure isn't periodic with respect to the lattice vectors you
gave, and hence it looks funny when you convert to a rectangular cell
(with mpb-data -r) and output.
For this kind of structure, you should use orthogonal lattice vectors.
That is, your periodic unit cell should be a sqrt(3) x 1 supercell, with
the unit length oriented along the waveguide. That is, *without* a
defect, your computational cell would look something like:
o o o o o o o o
o o o o o o o
o o o o o o o o
Note also that you can use geometric-objects-duplicates to duplicate
functions for arbitrary multiples of a given vector, rather than writing
out all of the duplicates manually.
Steven
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