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Dear Steven,
I am very interested in the topic
below. I was wondering if you could give a hint on the syntax of (meep::fields::add_dft_pt) when called from the Scheme
interface. Let's assume I would like to obtain the frequency spectrum of the Ex
field component at the point (0,0,0).
(run-sources+
(stop-when-fields-decayed 10 Ex (vector3 0 0 0) 1e-3) (to-appended "ex" (at-every 0.04 (in-point (vector3 0 0 0) output-efield-x))) ) how can I "feed" the Ex time domain
signal to the internal DFT algorithm? The reason why I don't simply calculate
the flux is that I would like to calculate the local E-field enhancement in a
plasmonic structure which is not necessarily equivalent to an
enhanced flux (Poynting vector) at this point, I think.
Thanks a lot
David Leuenberger
From: Steven G. Johnson <[EMAIL PROTECTED]> Subject: Re: frequency spectra for arbitrary grid points Newsgroups: gmane.comp.science.electromagnetism.meep.general Date: 2006-09-16 03:39:31 GMT (3 days, 1 hour and 5 minutes ago) On Fri, 15 Sep 2006, matt wrote: > Is it possible to calculate spectra from a single point, using > get-field-point, or only for flux regions? If so, how? Is there some > disadvantage to using a single sensor point? Yes, you can compute the field spectrum using a single point. You can either use get-field-point and compute the spectrum yourself, or use the built-in DFT functions (meep::fields::add_dft_pt). Or just compute the flux at a single point. |
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