Re: hollow core PBG fiber (number of supported defect modes)

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.