My understanding, that I've verified with just running the structure in MPB, is that the modal decomposition only takes into account the geometry argument of the flux region. So for the example you've linked, the modes that are found are plane waves, as the geometry argument of the flux region is the purple line, which is embedded in homogeneous space.
On Mon, Mar 25, 2019 at 2:40 PM Thomas AUZINGER <tho...@auzinger.name> wrote: > Hi, > > I am looking at the mode decomposition example for the binary grating > ( > https://meep.readthedocs.io/en/latest/Python_Tutorials/Mode_Decomposition/#diffraction-spectrum-of-a-binary-grating > ). > I have a basic question regarding the nature of this decomposition, > which is called via sim.get_eigenmode_coefficients: > > Does this decomposition take the whole structure into account or is it a > decomposition of only the monitor field? > Formulated differently: Is the geometry argument (or the dielectric > function) of the sim object relevant for the mode decomposition? > > Thanks, > Thomas > > > > _______________________________________________ > meep-discuss mailing list > meep-discuss@ab-initio.mit.edu > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
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