As far as I know, there remains the problem of the mode shape
generally being different for different frequencies. In some specific
cases, such as hollow metallic waveguide, the mode cross-section
remains the same, so it is easy to excite/detect the first mode
selectively at broad frequency range.
The frequency dependence isn't a major problem for computing output power in
each mode, since generally you only need the power at a small number of
frequencies (a few dozen to a few hundred), and Meep can compute the explicit
Fourier transforms of the fields in the flux plane at these
Another option would be to define an amplitude-recording-plane: for
instance, knowing the Ex-field and Hy-field, one can easily separate
the amplitudes of both forward- and backward-propagating waves along
the z-axis. The usual scattering problems with properly absorbing
boundaries then require
On Apr 14, 2014, at 4:52 PM, Filip Dominec filip.domi...@gmail.com wrote:
Another option would be to define an amplitude-recording-plane: for
instance, knowing the Ex-field and Hy-field, one can easily separate
the amplitudes of both forward- and backward-propagating waves along
the z-axis.
A more general solution would be to use code similar to the eigenmode-source
feature: call MPB to compute the modes for a given cross-section (and for each
desired frequency), and use those to perform the relevant overlap integrals
with the Fourier-transformed fields in the same cross-section.
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