Re: mpb-discuss Digest, Vol 82, Issue 3

Hi Yingjun

you can see by visualizing the mode image

Onder


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> Today's Topics:
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>    1. How to distinguish between the guided mode and folded mode,
>       in a big supercell? (Yingjun YL)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 09 Jan 2013 15:14:56 +0330
> From: Yingjun YL <[email protected]>
> To: [email protected]
> Subject: [MPB-discuss] How to distinguish between the guided mode and
> 	folded mode, in a big supercell?
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
> Dear Prof. and MPB users
>
> For simulating coupled cavities in photonic crystal slab, I have to
> choose a big supercell (e.g. 5a * 15a in x and y direction respectively).
>
> In order to assure the correctness of the ctl file and simulation, I
> simulate a photonic crystal waveguide by removing a row of holes in
> trangular lattice of holes in PC. When I use 1a*15a supercell, I can see
> clearly the Band Gap and guided mode in the gap. But when I use the 5a *
> 15a supercell, several modes folded in band gap.
>
> How can I recognize the guided mode?
>
> Seems, my question is a basic question in PBG and photonic crystal, but
> if any of the respected MPB user can help, it will be highly appreciated.
>
> Thanks
>
> Yingjun YL
>
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