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Dear Meepers,

I am trying to recover the amplitude and phase of each component of the magnetic
field at a single, fixed temporal frequency.  My materials are all linear.
Currently, I have a point source at the desired frequency with slow turnon.  I
wait for about 200 cycles for transients to die down, then take a handful of
snapshots separated by a quarter-period.  This works, but it's slow and
potentially subject to aliasing.  Is there a better way?

The obvious way would be to record the fields at every step and then FFT, but I
do not have terabytes of storage.  Is this a good application for the
undocumented FDFD solver?  Alternatively, as anyone attempted to select a single
frequency by accumulating a running inner product with exp(iwt)?

Thanks,
Ben
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