Hello,I'm solving a simple multilayer loss-free dielectric slab scattering problem, for the case of normal incidence.
The problem is simple enough that it can be solved analytically. The analytic solution matches published results, so I have confidence in its correctness.
As you can see in the attached plot, the resonance in the reflectivity is frequency shifted by about 10 percent, and the scaling isn't quite right.
The meep result doesn't change when I 1) increase the resolution 2) calculate over a more narrowband frequency range 3) increase pml thickness 4) increase spacing between scatterer and flux planes 5) increase spacing between source and flux planes/scatterer 6) set eps-averaging? to false 7) increase "decay-by" (and run the sim longer) 8) change the gaussian excitation center frequency 9) change the gaussian excitation cutoff 10) calculate reflectivity based on a flux point instead of a flux planeJust looking at the curve width make me think there's some kind of dispersive behavior, but I have no idea where it could be coming from. Any ideas?
Best Regards, Matt
compare.png
Description: meep_vs_analytic
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