Hi all, I want to calculate the E-field at a certain frequency on a surface. As far as I can tell, this feature is not implemented ... at least according to 10-year-old discussions I found on google (1 <http://meep-discuss.ab-initio.mit.narkive.com/c20vHwQX/use-save-flux-to-get-fourier-transforms-of-field-components> 2 <https://www.mail-archive.com/meep-discuss@ab-initio.mit.edu/msg00108.html> ).
If that's the case, I figure maybe I can cheat, by using near2far on a surface and then calculating the "far-field projection" onto the exact same surface. [In practice it seems I need to use a *slightly *different surface, maybe λ/10 away]. I expect this to be an accurate recording of the fields at that surface and at that frequency, except for possible overall scale-factor / phase shift, and also except for chopping off all the evanescent components of the fields. (Those things are all fine with me.) I tried this a couple times (in a 2D simulation), and the results I'm getting seem to be at least superficially plausible... Can anyone think of anything that I should be wary of here, like conditions under which this approach would or wouldn't work, and/or better ways to do it? (I did find this thing <http://meep-discuss.ab-initio.mit.narkive.com/DyEW5tL2/meep-frequency-snapshots-and-near-to-far-field-transform> but would rather not be messing with the source code and switching from python to scheme.) Thanks a lot in advance! Steve ~~ Steven J. Byrnes | Draper | http://www.draper.com/
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