1 dimensional photonic crstal

Hello

Iam trying to find  bandgap for a 1 dimensional photonic crystal.(bragg
reflector structure)
I have many doubts in simulating the structure..

1.As Iam dealing with a  1 dimensional structure,how can I specify my
lattice vectors such that  the structure repeats just in 1
direction.(i.e if crystal strucutre is periodic in x has to repeat in x
but not in y and z).. 
If I specify no-size in y or z direction it doesn't  consider y  at all
 but I  have to specify a length in that direction without the lattice
repeating...
Attached is the code that Iam using.
Please help me

Thanks
Hyma Yalamanchili  




----- Original Message -----
From: "F.S.F. Brossard" <[email protected]>
Date: Saturday, December 13, 2008 8:06 pm
Subject: Re: [MPB-discuss]
To: Hyma Yalamanchili <[email protected]>

> Hi Hyma,
> 
> MPB does some internal dielectric averaging between boundaries so 
> that your structure look more realistic. It also means you probably 
> don't need such high resolution. For me, I rarely had to use a 
> resolution beyond 16 in x and y for all bandgap calculations. I 
> didn't see a significant difference with higher res (except a few 
> %). Also, you can lower your supercell size in z to 8, even for low 
> index material such as yours.
> Howevever, you should increase your k-interp to 8 at least to make 
> sure you get a reasonably accurate bandgap.  
> Last advice: there is no need to calculate all points of the 
> reduced Brillouin zone to calculate the bandgap of a simple 
> triangular lattice with circular air-holes, at least for TE-like 
> modes (I have rarely looked at TM-like modes). In this last case, 
> just look at the K and M points of your first and second bands and 
> also at the intersection between the light cone and the G-K and G-M 
> directions.
> Hope this helps,
> 
> Frederic 
> 
> On Dec 12 2008, Hyma Yalamanchili wrote:
> 
> >Hi Frederic
> >
> >Attached is the control file which Iam using..
> >
> >Thank u so much for  your reply.
> >I hope my problem gets resolved
> >
> >Hyma
> >
> >----- Original Message -----
> >From: Frederic Brossard <[email protected]>
> >Date: Friday, December 12, 2008 1:13 pm
> >Subject: Re: [MPB-discuss] efield vs. dpwr, field definition --> 
> follow>up on old thread
> >To: Hyma Yalamanchili <[email protected]>
> >Cc: [email protected]
> >
> >> Hi Hyma,
> >> 
> >> Could you please let us know your control file? otherwise, it is 
> >> difficult to know why it takes so much time without asking you a 
> >> lot of 
> >> questions first.
> >> 
> >> Thanks,
> >> 
> >> Frederic
> >> 
> >> Frederic Brossard
> >> Researcher
> >> Cavendish Laboratory
> >> J J Thomson Avenue
> >> Cambridge CB3 0HE
> >> 
> >> 
> >> 
> >> Hyma Yalamanchili wrote:
> >> > Hii
> >> >
> >> > Iam in the initial stages of learning MPB tool.
> >> > My work is mainly focused on band gap tuning. 
> >> > I tried to change the radius every time  before I simulate and 
> >> find the
> >> > band gap but as Iam dealing with 3-D structures,its consuming 
> a 
> >> lot of
> >> > time like 4 to 5 hrs for each simulation to run.
> >> >  Can anybody suggest me a method  to find the radius of the 
> >> triangular> lattice photonic crystal for a particular band gap 
> >> using some kind of a
> >> > loop???
> >> >
> >> >
> >> > Thanks,
> >> > hyma
> >> >
> >> > ----- Original Message -----
> >> > From: "Steven G. Johnson" <[email protected]>
> >> > Date: Thursday, December 4, 2008 12:01 pm
> >> > Subject: Re: [MPB-discuss] efield vs. dpwr, field definition -->
> >> > follow up	on old thread
> >> > To: [email protected]
> >> >
> >> >   
> >> >> Your k point is wrong, for one thing.  Maybe you're not 
> looking 
> >> at 
> >> >> a  
> >> >> band underneath the light line.
> >> >>
> >> >> Look at the line-defect.ctl example file included with MPB.
> >> >>
> >> >> Alternatively, you may find it easier to rearrange things 
> into 
> >> an  
> >> >> orthogonal supercell.  See:
> >> >>
> >> >> http://article.gmane.org/gmane.comp.science.photonic-bands/1376
> >> >> http://article.gmane.org/gmane.comp.science.photonic-bands/1213
> >> >>
> >> >> Steven (with a v)
> >> >>
> >> >> On Dec 4, 2008, at 12:10 AM, Chad Husko wrote:
> >> >>
> >> >>     
> >> >>> Stephen,
> >> >>> I spent a little more time with the fields and have some 
> follow 
> >> >>>       
> >> >> up  
> >> >>     
> >> >>> questions (on the bottom).
> >> >>>
> >> >>> First, some answers to yours. I will be using the proper 
> >> >>>       
> >> >> definition  
> >> >>     
> >> >>> of the effective area as you suggest. I am sure that there 
> is 
> >> an 
> >> >>>       
> >> >> Ex  
> >> >>     
> >> >>> field. The propagation direction is x of the PhCWG. z is the 
> 
> >> >>> vertical super cell and y is the direction of sqrt(3)*a of 
> the 
> >> >>>       
> >> >> air  
> >> >>     
> >> >>> holes. Attached is the CTL file.
> >> >>>       
> >> >> _______________________________________________
> >> >> mpb-discuss mailing list
> >> >> [email protected]
> >> >> http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss
> >> >>
> >> >>     
> >> >
> >> > _______________________________________________
> >> > mpb-discuss mailing list
> >> > [email protected]
> >> > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss
> >> >   
> >> 
> >
> 
> -- 
> Dr Frederic Brossard
> Researcher
> Hitachi Cambridge Laboratory
> Cavendish Laboratory
> J J Thomson Avenue
> Cambridge CB3 0HE
> 
> 
> 
> 
>

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