Galaa This seems to be a different problem from mine because when I have seen these excursions, they have not been reproducible either in position or in amplitude. Have you varied the resolution of your FDTD routine or the periodicity of your “comb” structure? One other suggestion: try to make sure that your computational grid aligns exactly on the interface between materials…I have seen strange artifacts arise when the computational points straddle, say, a discontinuous permittivity boundary.
John > On May 28, 2019, at 21:01, Galaa Badrakh <galaa.cod...@gmail.com> wrote: > > Hi John > > Please have a look at the attachment. I have two different duplications and > the defects are in the duplications. If I re-run I get the same defects at > the same positions. Is this the problem you are facing? I have plotted with > pyplot and also with Mathematica, no difference at all. I have also tried > with "mp.at_beginning(mp.output_epsilon)" but changes. > > G > > On Wed, 29 May 2019 at 00:45, John Weiner <johwei...@gmail.com > <mailto:johwei...@gmail.com>> wrote: > Hi Galaa, > > I’ve seen similar things, large isolated, unphysical excursions in otherwise > perfectly reasonable results when plotting data from a meep output. Are you > using Matplotlib/pyplot for your plotting routines? And do the excursions > appear at exactly the same points and with the same amplitudes reproducibly > or do they vary unpredictably? I would be quite interested to know if anyone > has a good explanation and a good fix. > > Best regards, > > John > > > On May 28, 2019, at 17:33, Galaa Badrakh <galaa.cod...@gmail.com > > <mailto:galaa.cod...@gmail.com>> wrote: > > > > Hi All. > > > > I am new to MEEP and trying to use the "geometric_objects_duplicates" > > feature. After simulation complete, I extracted the dielectric spatial > > profile with "data=sim.get_array(center=mp.Vector3(), > > size=mp.Vector3(0.0,0.0,height), component=mp.Dielectric)" to double check > > my geometry but I see unexpected lines at some interfacing points, have a > > look at attached picture. Is this the artifact of subpixel smoothing? If > > so, how to avoid this artifact? > > > > Thanks in advance > > > > G > > <structure.png>_______________________________________________ > > meep-discuss mailing list > > meep-discuss@ab-initio.mit.edu <mailto:meep-discuss@ab-initio.mit.edu> > > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss > > <http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss> > > <structure.png>
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