On Apr 22, 2014, at 10:01 AM, Ehsan Saei <e.s...@hotmail.com> wrote:
> I simulated a point source which is located in free-space (air ) and tried to
> compute the power radiated by the source and travels through a cubic that
> surrounds the source. After plotting the data I have noticed that the power
> has a frequency center different from that I have used for the source.
Regardless of whether you use an exact gaussian source or not, the radiated
power spectrum is never the same as the power spectrum of the source (except in
1d vacuum), because it gets multiplied by the local density of states (which in
3d goes as frequency squared).
This has nothing to do with Meep, it is an intrinsic fact of wave equations.
See:
http://ab-initio.mit.edu/wiki/index.php/Meep_FAQ#How_does_the_current_amplitude_relate_to_the_resulting_field_amplitude.3F_______________________________________________
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