The target-freq feature as it is currently implemented, unfortunately, has
very slow convergence. You may find it faster to just compute lots of
bands (enough to cover frequencies up to and including the gap).
To find kz as a function of frequency, once you have identified the band
that you want, there is a built-in function in MPB to perform this
inversion (see the reference section).
Cordially,
Steven G. Johnson
On Fri, 9 Jun 2006, stephane chatigny wrote:
I would like to evaluate the number of modes (and their respective group
velocities) supported by the defect of a hollow core PBG fiber.
I am planning to iterate in function of the target-freq from the lower band
to the upper-band frequency of the band gap, In order to see how many
different frequency will converge.
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