On Jun 29, 2009, at 9:05 AM, Ajayram S K S M wrote:
Earlier, in the 'meep materials' there was a stub for saturable
absorption for which I was waiting for. Now that stub has been
completely removed. I want simulate an active material and I thought
saturable absorption would provide a way. Can you tell me how to go
about modeling active materials in MEEP?
Right now, there's no support for this in the code.
You are welcome to try the old version of Meep. The problem with that
version is that the support for saturable materials, written by David
Roundy who is no longer involved with Meep, was completely
undocumented and impractical to maintain going forward.
The basic approach to doing this in FDTD is described in the paper by
my colleague Peter Bermel:
http://link.aps.org/doi/10.1103/PhysRevB.73.165125
I think it should be straightforward to code something like this in
Meep (indeed, I'm pretty sure that this is essentially what David
did), especially now that in recent versions the polarization updates
are only a few lines of code. However, obviously this would involve
getting into the guts of the Meep sources and is probably not a task
for inexperienced programmers.
Steven
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