On Aug 12, 2008, at 4:42 AM, matt wrote:
> Next, because your structure is an infinite and periodic slab plane,  
> you
> can truncate the compuation domain in the X and Y dimensions using
> periodic boundary conditions.  To do this, you have to choose a unit
> cell which will correspond to your periodicity.  With your hexagonal
> lattice, this could correspond to a circle in the center of your cell,
> plus four quarter-circles in the corners, for example.

As I understand it, Ryan wants to calculate the transmission through a  
finite number of periods in the Y direction.  Hence he needs to use  
PML in the Y direction too.

> In summary, PML in Z direction, periodicity in X and Y.

(Technically, the PML directions are also periodic.  It's just that  
the periodicity in those directions is irrelevant, as I explained in  
my previous message.)


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