Sung Park LEE | 2 Jan 15:07 2007
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How can I define the lattice structure?

Dear Steven and MPB’s users,

   It is OK when I define the polygonal shapes (example: hexagonal shape) in square lattice by using a set of overlapping blocks (each block with the basis vectors), but it is not OK when I define the polygonal shapes in triangular lattice, because in triangular lattice, there are a set of basis vectors:

                          (basis1 (/ (sqrt 3) 2) 0.5)

                          (basis2 (/ (sqrt 3) 2) -0.5)

 
Could you give me some suggestion about that?

I thank you in advance,

Sung Park Lee

 

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MPB solver for lossy media

Hi Steven,
I'm currently using MEEP for photonic crystal simulations and have lately wanted to explore the possibility of freequency domain methods such as MPB to try and see if I can speed up the computations. One of the arguments against using MPB that I've heard is that it cannot simulate lossy media, which is what I currently have. I wanted to verfy with you if this is true.

Thanks,
Badri

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Steven G. Johnson | 4 Jan 22:46 2007

Re: MPB solver for lossy media

On Thu, 4 Jan 2007, Ramamurthi, Badri N (GE, Research) wrote:
> I'm currently using MEEP for photonic crystal simulations and have
> lately wanted to explore the possibility of freequency domain methods
> such as MPB to try and see if I can speed up the computations. One of
> the arguments against using MPB that I've heard is that it cannot
> simulate lossy media, which is what I currently have. I wanted to verfy
> with you if this is true.

That's correct, Meep can only model lossless systems, at least directly. 
If you directly want to model include absorption loss, you need to switch 
to a different code, e.g. our FDTD code (Meep) supports absorption.

On the other hand, if you have dielectric materials where the absorption 
is small (Im epsilon << Re epsilon), then this is probably overkill.  In 
this case, it is very accurate to compute the modes of the lossless system 
and then to evaluate their losses via perturbation theory (a simple 
integral of the energy density in the absorbing media).

Steven
张继皇 | 8 Jan 14:10 2007
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hollow core PBG fiber

Hello all,

I would like to simulate the electric field and magnetic field of modes supported by the hollow core PBG fiber.

However, I am not sure how to proceed with MPB.

This is my plan as follow:

First, define a supercell structure with the defect.

Then, run efield/hfield in z direction.

But I am also confused about how to write the output efield/hfield in CTL file and how to plot the diagram.

Thanks for your help

Regards

Jh zhang



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Nguyen Thi Minh Hang | 15 Jan 15:23 2007
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mpb for WIN XP

Hello,

I've just subscribed to mpb-discuss. In fact I have not much idea about mpb except that it help to calculate the bandgap of PC througth the book "Photonic Crystals the road from theory to practice".

I wonder, there is any version of mpb for win XP, since I am not familiar to LINUX?

Thank you very much

Hang

 

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Steven G. Johnson | 15 Jan 21:47 2007

Re: mpb for WIN XP

I'm told it is possible to install MPB under Windows using Cygwin, a free 
Unix-like environment for Windows that you can download from 
www.cygwin.com.  You will still need some understanding of Unix, however, 
so you may want to consult a local Unix guru at your university for help.

On Mon, 15 Jan 2007, Nguyen Thi Minh Hang wrote:
>  I wonder, there is any version of mpb for win XP, since I am not 
> familiar to LINUX?
Steven G. Johnson | 15 Jan 22:48 2007

Re: hollow core PBG fiber

On Mon, 8 Jan 2007, ÕÅ¼Ì»Ê wrote:
> I would like to simulate the electric field and magnetic field of modes 
> supported by the hollow core PBG fiber. However, I am not sure how to 
> proceed with MPB.
> This is my plan as follow:
> First, define a supercell structure with the defect.

First, I would compute a unit cell with no defect, so that you know where 
the band gaps and light line are.

> Then, run efield/hfield in z direction.
> But I am also confused about how to write the output efield/hfield in 
> CTL file and how to plot the diagram.

(run output-efield output-hfield)

will output HDF5 files of the E and H fields for all of the bands.  You 
can then plot them using any tool that can read HDF5 files, such as 
Matlab, or use my h5utils package to convert the HDF5 files into another 
format.

See the data-analysis tutorial in the MPB manual.

Steven
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Nguyen Thi Minh Hang | 17 Jan 16:19 2007
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Re: mpb-discuss Digest, Vol 11, Issue 6

Thank you Steven, with your consultancy I've got promiss from a friend of mine, he will help me to install mpb for UNIX . I may try the vesion first.
I may need your further help.
Thank a lot.
Hang

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Today's Topics:

1. Re: mpb for WIN XP (Steven G. Johnson)
2. Re: hollow core PBG fiber (Steven G. Johnson)


----------------------------------------------------------------------

Message: 1
Date: Mon, 15 Jan 2007 15:47:46 -0500 (EST)
From: "Steven G. Johnson"
Subject: Re: [MPB-discuss] mpb for WIN XP
To: mpb-discuss <at> ab-initio.mit.edu
Message-ID:
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed

I'm told it is possible to install MPB under Windows using Cygwin, a free
Unix-like environment for Windows that you can download from
www.cygwin.com. You will still need some understanding of Unix, however,
so you may want to consult a local Unix guru at your university for help.

On Mon, 15 Jan 2007, Nguyen Thi Minh Hang wrote:
> I wonder, there is any version of mpb for win XP, since I am not
> familiar to LINUX?



------------------------------

Message: 2
Date: Mon, 15 Jan 2007 16:48:17 -0500 (EST)
From: "Steven G. Johnson"
Subject: Re: [MPB-discuss] hollow core PBG fiber
To: mpb-discuss <at> ab-initio.mit.edu
Message-ID:
Content-Type: text/plain; charset="iso-8859-1"

On Mon, 8 Jan 2007, ÕÅ¼Ì»Ê wrote:
> I would like to simulate the electric field and magnetic field of modes
> supported by the hollow core PBG fiber. However, I am not sure how to
> proceed with MPB.
> This is my plan as follow:
> First, define a supercell structure with the defect.

First, I would compute a unit cell with no defect, so that you know where
the band gaps and light line are.

> Then, run efield/hfield in z direction.
> But I am also confused about how to write the output efield/hfield in
> CTL file and how to plot the diagram.

(run output-efield output-hfield)

will output HDF5 files of the E and H fields for all of the bands. You
can then plot them using any tool that can read HDF5 files, such as
Matlab, or use my h5utils package to convert the HDF5 files into another
format.

See the data-analysis tutorial in the MPB manual.

Steven

------------------------------

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End of mpb-discuss Digest, Vol 11, Issue 6
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