On Oct 14, 2008, at 5:58 AM, Szymon Lis wrote:
My problem in meep are strange oscillation in reflection spectrum
form cavity waveguide. The code (.ctl file) and graph are attached.
That is my the best result. When I try different resolution, or/and
various distances between source and phc oscillation are bigger.
Even reach 1.4 reflection!. I don't know what exactly it is?
Numerical error? How to avoid it?
There are two possible sources for such oscillations.
One is that they are physical Fabry-Perot oscillations, and are a high-
frequency because they are interference between reflections separated
by a large distance. i.e. not from your cavity, but from the ends of
your waveguide or something like that.
The other is that they are a windowing artifact from your finite run
time. This is simple to check: increase your run time by a factor of
10 (for example), and the oscillations should go away (or at least
greatly decrease).
Steven
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