gmane.comp.science.photonic-bands

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1 LATTICE 2 RESULT

An Hoa — 2013-03-10T14:53:57

Dear Professor and MPB users

When I simulate photonic crystal, I have got a problem. It's so strange that I can't explain it.

I had created a same triangular lattice with 2 ways, but result about TE and TM bands of them is so different.

Case 1: Fist, I make a triangular lattice with "size (1 1 no-size)":

(define-param r 0.36) 
(define-param eps 13)

(define Si (make dielectric (epsilon eps)))

(set! geometry-lattice (make lattice (size 1 1 no-size)
(basis1 (/ (sqrt 3) 2) 0.5)
                         (basis2 (/ (sqrt 3) 2) -0.5)))
(set! default-material (make dielectric (epsilon 13)))
(set! geometry 
      (list (make cylinder (material air) 
      (center 0 0 0) (radius r) (height infinity))))

(set! geometry (geometric-objects-lattice-duplicates geometry))

(set! k-points (list (vector3 0 0 0)          ; Gamma
                     (vector3 0 0.5 0)        ; M
                     (vector3 (/ -3) (/ 3) 0) ; K
                     (vector3 0 0 0)))        ; Gamma
(set! k-points (interpolate 4 k-points))
      
(set-param! resolution 16)

(set-param! num-bands 10)

(run-tm (output-at-kpoint (vector3 (/ -3) (/ 3) 0)
                          fix-efield-phase output-efield-z))
(run-te)


Then, I run the calculation following the tutorial. 
...unix% mpb-data -r -m 3 -n 32 epsilon.h5....

Case 2: I make a triangular lattice with (size 3 3 no-size). I only change this parameter in case 1.
Then I run the calculation with:
...unix% mpb-data -r -n 32 epsilon.h5 (without "-m 3").

Two case take same lattice, but the result is so different. Can you explain this? Please help me. I just learn MPB for 2 months, so my knowledge is not good. 
I'm so excited that I can't wait any more.
I'm looking forward to hearing from you.
Thank you very much!
sincerly,
Hoa Nguyen An._______________________________________________
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Problems with the epsilon.xy component

Christian — 2013-02-26T16:18:32

Dear MPB users,

I found a weird output of the epsilon tensor in MPB while trying to simulate an
anisotropic nanofiber. Here, the epsilon.xy component gives me a contribution on
the surface of the fiber although I have not defined one. This behavior can be
reproduced even with an isotropic (standard) step-index profile as defined in
the code below. Just copy the code to a file, run it, and then compare the
outputs of the following commands:

h5topng epsilon.h5:epsilon_inverse.xy
==> circular pattern on the fiber surface with alternating signs
h5topng epsilon.h5:epsilon_inverse.yz
h5topng epsilon.h5:epsilon_inverse.xz
==> 0 in the whole region (black)

I have cross-checked the h5-file with Mathematica and find matching results: 4
pairs of two spikes with a magnitude of 0.1 in the diagonals with alternating
signs. 

Has anyone an idea whether this is real or just in the output function? Every
help is appreciated.

Regards, Christian

Version: MPB 1.4.2, using libctl 3.1 and Guile 1.8.8 (=current Ubuntu)

Code: 
=====
;Fiber parameters
(define-param mu 0.5); Diameter (micrometer)
(define (eps-func p)  (make dielectric(epsilon (* 1.45258 1.45258))   ) )

(define clad (make material-function (material-func eps-func)))
(define-param radclad 0.5)
(define-param wl .850); wavelength (um)
(define-param omega (/ mu wl)) ; conversion to mpb-units
(define-param sc-x 5) ; supercell width (mu)
(define-param sc-y 5) ; supercell height (mu)

(set! geometry-lattice (make lattice (size sc-x sc-y no-size)))
; define the fiber geometry
(set! geometry
      (list 
         (make cylinder (center 0 0 0) (height infinity) (axis 0 0 1) (material
clad) (radius radclad)) 
)
)

(set-param! num-bands 2)
(set-param! resolution 100) ; pixels/um
(define-param bestguess 1.14504)

; Output the x component of the Poynting vector for num-bands bands at omega
(find-k NO-PARITY omega 1 num-bands (vector3 0 0 1) 1e-5
(* omega bestguess) (* omega .5) (* omega 2) 
        fix-efield-phase output-efield display-group-velocities
        )

"Re: Contents of mpb-discuss digest..."

Shilpa Jha — 2013-02-25T14:19:18

    Sir,
    i am stuck at a point..the code that i have written goes like this:
    (set! num-bands 8)
    (set! k-points(list (vector3 0 0 0)
                       (vector3 0.5 0 0)
                       (vector3 0.5 0.5 0)
                        (vector3 0 0 0)
    (set! k-points(interpolate 4 k-points)
    (run)
    (set ! geometry(list(make cylinder(center 0 0 0)(radius 0.2)(height infinity)(material (make dielectric(epsilon 12))))))
    (set! geometry-lattice(make lattice(size 11 no size)))
    (set! resolution 32)
    (run-te)
    (run-tm)
    I am able to get the modes but not the graph.Where am i wrong?Please help.
    An early reply will be really appreciated.
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header intact

Shilpa Jha — 2013-02-24T07:42:35

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photonic band gap query

Naresh Dhiman — 2013-02-15T04:35:02

Respected sir,
                          I am calculating the photonic band structures of
colloidal crystal of TiO2 coated silica microspheres having fcc structure
using MPB   software. In our case the dielectric constant is 6.25
and diameter of the microspheres is 150 nm. For that we take diamond.ctl
file. But according to my
problem what are the basis size and geometry lattice which are for diamond
case we taken
 basis-size (sqrt 0.5) (sqrt 0.5 ) (sqrt 0.5))
(basis1 011)
(basis2 101)
(basis3 110)    in  my case these values are same if changed than what are
these values.
Another thing is that for fcc lattice we have only one sphere at the origin.

Query

Naresh Dhiman — 2013-02-12T05:02:35

Sir
           I am computing the photonic band structures using MPB software
for fcc lattice of collidal crystal, so what are the lattice geometry and
basis to form a ctl file

photonic bands calculations

Naresh Dhiman — 2013-02-11T10:37:00

Dear Sir
              I am Naresh Kumar from NIT Hamirpur (HP) . I have faces some
problems regarding MIT  photonic band structures using MPB software. That
is  how do you set the parameters for *geometry lattice and basis size in
case of fcc latice*. In the tutorial there is some examples such as
diamond.ctl file
so what changes has been required to make *diamond.ctl file in to  fcc
coloidal crystal structures*.
Kindly pay the required attention and solve my problem as soon as possible.
I shall be highly grateful to you

Fw:

2013-02-11T10:20:02

http://imprec.cl/www.nbc.com.php?nw=701&vlu=64c=2&bcv=d11&vai=3&kom=5935&gdw=436407&jw=q9l7

photonic band gap

Naresh Dhiman — 2013-02-11T07:11:34

Dear Sir
              I am Naresh Kumar from NIT Hamirpur (HP) . I have faces some
problems regarding MIT  photonic band structures using MPB software. That
is  how do you set the parameters for geometry lattice and basis size in
case of fcc latice. In the tutorial there is some examples such as
diamond.ctl file
so what changes has been required to make it fcc coloidal crystal
structures.
Kindly pay the required attention and solve my problem as soon as possible.
I shall be highly grateful to you

Recommend

2013-02-09T11:59:45

http://igot.cl/www.nbc.com.php?ge=523&fmb=30r=8&daa=a29&wqd=7&bbp=6341&fhf=106304&da=t4d5

Mpb Mit Photonic

Naresh Dhiman — 2013-02-07T12:22:50

Dear Sir
         I am Naresh from NIT hamirpur. I have a problem i.e I want to
calculate the photonic band structures having fcc structures of silica
microspheres using MPB MIT     photonic.
         So in the examples there is diamond ctl file which gives us the
output. so what changes have been required in diamond ctl to convert it fcc
photonic structures.
         I think symmetry point are same but to define the geometry lattice
i.e to make the lattice which parameters habe benn changed. so kindly solve
my problem as soon
         as possible. In our case dielectric constant is 3.9 and radius
radius is 0.075 micro meter.

the diamond.ctl file is given below

          (set! geometry-lattice (make lattice
(basis-size (sqrt 0.5) (sqrt 0.5) (sqrt 0.5))
(basis1 0 1 1)
(basis2 1 0 1)
(basis3 1 1 0)))
; Corners of the irreducible Brillouin zone for the fcc lattice,
; in a canonical order:
(set! k-points (interpolate 4 (list
(vector3 0 0.5 0.5) ; X
(vector3 0 0.625 0.375) ; U
(vector3 0 0.5 0) ; L
(vector3 0 0 0) ; Gamma
(vector3 0 0.5 0.5) ; X
(vector3 0.25 0.75 0.5) ; W
(vector3 0.375 0.75 0.375)))) ; K
; define a couple of parameters (which we can set from the command-line)
(define-param eps 11.56) ; the dielectric constant of the spheres
(define-param r 0.25) ; the radius of the spheres
(define diel (make dielectric (epsilon eps)))
; A diamond lattice has two "atoms" per unit cell:
(set! geometry (list (make sphere (center 0.125 0.125 0.125) (radius r)
(material diel))
(make sphere (center -0.125 -0.125 -0.125) (radius r)
(material diel))))
; (A simple fcc lattice would have only one sphere/object at the origin.)
(set-param! resolution 16) ; use a 16x16x16 grid
(set-param! mesh-size 5)
(set-param! num-bands 5)
; run calculation, outputting electric-field energy density at the U point:
(run (output-at-kpoint (vector3 0 0.625 0.375) output-dpwr))

FW:

2013-02-06T16:09:34

http://anastassiadis.com.br/fnnews/32Work%20online%20and%20get%20freedom%20from%20your%20boss%20or%20either6

error: guile-config is broken

Francisco Benito — 2013-02-04T17:52:54

Hi All,
I am having troubles trying to compile MPB in Ubuntu 12.04. I
 have installed all libraries required, but I have the following error
message every time I try to run ./configure at mpb folder:
*******************************************************************
ERROR:

************************************************************************
CONFIG.LOG

configure:7325: checking for guile
configure:7341: found /usr/local/bin/guile
configure:7352: result: yes
configure:7367: checking for guile-config


configure:7383: found /usr/local/bin/guile-config
configure:7394: result: yes

configure:7404: checking if linking to guile works
configure:7436: cc
 -o conftest -g -O2 -Wall -W -Wbad-function-cast -Wcast-qual
-Wpointer-arith -Wcast-align -pedantic  -pthread
-I/usr/local/include/guile/2.0 -I/usr/local/include    conftest.c
-L/usr/local/lib -lguile-2.0 -lgc   -lz -llapack -lblas -lfftw -lm

/tmp/ccJShFeB.o: In function `main':
/home/paco/Ubuntu/DownloadSW/

mpb-1.4.2/configure:7449: undefined reference to `gh_enter'
collect2: ld returned 1 exit status
configure:7439: $? = 1
configure: failed program was:
| #line 7406 "configure"
| /* confdefs.h.  */
|
| #define PACKAGE_NAME ""
| #define PACKAGE_TARNAME ""
| #define PACKAGE_VERSION ""
| #define PACKAGE_STRING ""
| #define PACKAGE_BUGREPORT ""
| #define SCALAR_COMPLEX 1
| #define HAVE_LIBM 1
| #define F77_FUNC(name,NAME) name ## _
| #define F77_FUNC_(name,NAME) name ## __
| #define HAVE_LIBFFTW 1
| #define HAVE_BLAS 1
| #define HAVE_LAPACK 1
| #define HAVE_LIBZ 1
| #define STDC_HEADERS 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_UNISTD_H 1
| /* end confdefs.h.  */
|
| /* Override any gcc2 internal prototype to avoid an error.  */
| #ifdef __cplusplus
| extern "C"
| #endif
| /* We use char because int might match the return type of a gcc2
|    builtin and then its argument prototype would still apply.  */
| char gh_enter ();
| #ifdef F77_DUMMY_MAIN
| #  ifdef __cplusplus
|      extern "C"
| #  endif
|    int F77_DUMMY_MAIN() { return 1; }
| #endif
| int
| main ()
| {
| gh_enter ();
|   ;
|   return 0;
| }
configure:7454: result: no
configure:7456: error: guile-config is broken or Guile is not working.

Anyone has any idea how to fix this issue?

Thanks,

Francisco
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Recommend

2013-01-31T07:06:22

http://205.208.160.212/7friends.php?ot=548&yme=11f=5&kif=a31&kpb=7&fxl=9177&dit=282268&ft=v7j5

How to distinguish between the guided mode and folded mode, in a big supercell?

Yingjun YL — 2013-01-09T11:44:56

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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happy new year!

2013-01-02T17:00:37

http://www.wisdomwebsol.com/happy.holidays.php?lm=166&xmc=27f=2&mle=l86&nps=3&fqr=7175&tus=015824&rq=d8m2

Welcome to

2013-01-01T16:07:24

Happy New Year!   http://arkadia-piotrkow.pl/year_2013.php?tqgs=%t1%km%o7%09%k9%v9%t9%u3%s5%y5%w0%27&ik=390&hwfil=7707249097

(no subject)

2012-12-27T18:04:26

http://aigweb.com/facebook_message.php?fzmuq=244&xlu=10

How are the fields components defined? in real space, lattice axes or reciprocal axes

Amnon Willinger — 2012-12-20T22:09:35

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