Dear Meep users: I set up a simple 2D simulation with a Gaussian source (frequency=2, fwidth=2) for reference purposes. The whole cell consist of one material with refractive index n=1.5. Around the source in the center I've built two 'boxes' as sets of flux-regions (four 1D lines each) to calculate the flux spectra via add-flux (see attached sketch). The simulation runs until Ez reaches a certain limit of its peak value.
>From the results I sum up the four fluxes for the inner and the outer 'box', respectively. When I check the resulting flux spectra, I observe a Gaussian-like shaped flux distribution (see attached pic). Both inner and outer box yield the same spectrum -> the orange line in the plot. However, the peak frequency is shifted to higher frequencies w.r.t. to the center frequency of 2. The dashed line shows the theoretical spectrum of the source (Fourier transform of the the Gaussian pulse according to the Meep reference), normalized in a way that both curves have the same integral. Can anyone tell me, why the 'measured' spectra seems to be shifted in frequency? Thanks in advance, Johannes
StdFluko_spectra_Reference.ctl
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ReferenceSimulation.png
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