Dear Steven,
Thanks a lot for your consideration! But I had paid attention to this point.
Actually, the Cartesian y direction is the direction of the waveguide.
Would you mind giving me a hand again?
Thanks a lot again!
Sincerely
Hongliang Ren
======= 2006-08-21 10:16:27 您在来信中写道：=======
>On Sun, 20 Aug 2006, hlren wrote:
>> This is 2D triangular lattice photonic crystal with air holes in GaAs
>> substrate. The backgound dielectric index is 11.4. We calculalte the
>> dispersion relations of line defect waveguides filled with liquid
>> crystal, and the attached file is about the supercell, and Dark and
>> light shaded regions indicate GaAs and liquid crystals, respectively.
>> When the rotation angle of the director of the liquid crystal is 90°,
>> the components of the dielectric tensor are ne*ne,no*no,and zero in xx
>> ,yy, and xy directions,respectively, where ne is 1.706 ,and no is 1.522
>> ( this direction is in accord with that in the supercell). I try some
>> examples about liquid crystals, and the problem is also present. Would
>> you mind scanning my ctl file?
>
>When you specify the dielectric tensor, you are specifying it in Cartesian
>coordinates. This is not the same as the lattice basis. So, in your case
>where the Cartesian x direction is *not* the direction of your waveguide.
>This means that the principal axes of your dielectric tensor are not
>aligned with your waveguide like you probably want.
>
>Cordially,
>Steven G. Johnson
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致
礼！
hlren
[EMAIL PROTECTED]
2006-08-21
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