On Aug 4, 2012, at 4:44 AM, Onder Karakilinc wrote:
> is there any source (article or sample code) simulated in a Meep for
> nonlinear switching based on the Kerr type intensity dependent refractive
> index change?
>
Sorry, I don't have any sample code for this.
> What are the key points to be considered in order to simulate such a study?
>
1) understand the linear system first. The behavior of the linear system is
deeply connected to that of the nonlinear system, and it really matters a lot
how you tune your linear resonance (see e.g. chapter 10 of our book,
jdj.mit.edu/book and citations therein)
2) Once you turn on the nonlinearity, it will be most easy to understand in
steady state: turn on a continuous source and run for long enough to reach
steady state (i.e. several lifetimes of your resonant mode)
3) Getting the power right is a bit tricky, because it is easy to screw up the
normalization. If you have any trouble, you can just keep doubling power
(multiply current amplitude by sqrt(2)) until you see the onset of nonlinear
effects.
(The nice thing about coupled-mode theory, as described in chapter 10, is that
it allows you to do FDTD only for the linear system, which is much faster,
since the semianalytical nonlinear coupled-mode equations are essentially exact
for practical Kerr phenomena where the refractive index changes are < 1%.)
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