Dear Prof.Steven and others,
Thank you for your answer.
But my question is how to set the K path in calculating and
projecting the slab mode?
You known, projecting the slab mode needs to scan the full area
of Brillouin zone, then project to the waveguide direction.
Below is my code, Could you please have a look and tell me whether it
is correct or not (I think there may something wrong in setting the
reciprocal lattice and k path ):
(define-param kymin 0)
(define-param kymax 0.57735)
(define-param k-interp 20)
(define (do-stuff k k-hi k-inc)
(if (<= k k-hi)
(begin
(set! k-points (interpolate k-interp (list (lattice->reciprocal
(vector3 k kymin 0))
(lattice->reciprocal (vector3 k kymax 0)))))
(run-zeven )
(do-stuff (+ k k-inc) k-hi k-inc)
)))
(do-stuff 0 0.5 0.1)
Best wishes
Ryan
On Mar 28, 2007 2:20 AM, Steven G. Johnson <[EMAIL PROTECTED]> wrote:
> On Tue, 13 Mar 2007, Ryan Hao wrote:
> > In the case of line defect waveguide in photonic crystal slab,I succeed
> > in caculating the waveguide mode with MPB.but there still something
> > left:I must find way to project the band strucure of the regular lattice
> > of the slab(slab mode) and the lightcone?You can see in the below
> > picture,the blue line represent for the lightcone,and the green line
> > represent for slab mode.
>
> Projecting the light cone (for a uniform substrate/superstrate) is easy --
> it is just the kmag output column divided by the substrate index.
>
> For projecting the modes of the unperturbed slab, the easiest thing to do
> is to use the same computational cell as your line-defect waveguide, but
> without the defect. (In fact, you can use a smaller supercell if you
> want, as long as you plot the slab bands for several values of ky from 0
> to 0.5, where y is the direction perpendicular to your waveguide, assuming
> a rectilinear supercell.)
>
> Cordially,
> Steven G. Johnson
>
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>
--
===========================================
Best wishes
Yours,
Ryan Hao
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