Dear friends,
I'm trying to change the structure during the simulation. The code below is
one example. This code gives me a big error message. What is wrong with it?
res = 40 # pixels/um (originalmente, 20)
eps = 9 # dielectric constant of the hole
r = 0.4 # radi
Good morning
I am a beginner in Meep. Currently, I am trying modifying
the simulation in Eigenmode source tutorial reported in
meep documentation.
Here I report the code I am using
import meep as mp
import numpy as np
import matplotlib.pyplot as plt
w = 5 # width of waveguide
delta_n
Galaa
This seems to be a different problem from mine because when I have seen these
excursions, they have not been reproducible either in position or in amplitude.
Have you varied the resolution of your FDTD routine or the periodicity of your
“comb” structure? One other suggestion: try to ma
Hi John
Please have a look at the attachment. I have two different duplications and
the defects are in the duplications. If I re-run I get the same defects at
the same positions. Is this the problem you are facing? I have plotted
with pyplot and also with Mathematica, no difference at all. I have
Hi Galaa,
I’ve seen similar things, large isolated, unphysical excursions in otherwise
perfectly reasonable results when plotting data from a meep output. Are you
using Matplotlib/pyplot for your plotting routines? And do the excursions
appear at exactly the same points and with the same ampl
Hi All.
I am new to MEEP and trying to use the "geometric_objects_duplicates"
feature. After simulation complete, I extracted the dielectric spatial
profile with "data=sim.get_array(center=mp.Vector3(),
size=mp.Vector3(0.0,0.0,height), component=mp.Dielectric)" to double check
my geometry but I se
Hi https://goo.gl/DSTCVJ
Gustavo
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Dear meep users,
I just don't know why there is not Si in the material library,it is a very
common material.And I found the refractive index in Medium is
frequency-independent ,does this mean that refractive index does not change
with wavelength?It does not make sense,and how can i define Si correc
Dear Professor,
Good day.
I am a fresher to meep and don't it's operating mechanism very well,so some
basic problems is always persecuting me.I just want to know how to calculate
the transmission efficiency of a straight waveguide the MEEP Documentation
mentions at python tutorial .
Thanks
sjc_
Hey
https://goo.gl/c8AcQg
Gustavo
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(set! k-point 1 1 0) will set bloch vectors as (1 0 0) (0 1 0) or (1 1 0)?
What is the difference between (set! k-point 0 0 0) and (set! k-point 1
1 0) ?
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Hi meep users
Am working on ring resonators comprising of two straight parallel waveguides
and a single ring, the input is in one of the straight waveguides , the
coupling is taking place well but what is missing is how the drop port comes in.
any assistance is highly appreciated.
thanks in advan
Dear Shampy,
this topic has been discussed many times. Generally you can not force
a complex value of permittivity in FDTD. You can however define a
high-frequency oscillator that introduces losses.
More on this topic is at
http://ab-initio.mit.edu/wiki/index.php/Dielectric_materials_in_Meep
or se
Dear Steven and other Meep users,
I am doing a simulation in which I require to use a complex dielectric constant
of the form(say for example):
epsilon = 1 + 0.01i
For my simulation the frequency isn't fixed, instead I have to use a gaussian
source with some finite width.
And in the whole simu
On Apr 18, 2014, at 10:12 AM, ISAAC MATERE wrote:
> hallo meep users
> can coupling two
> straight waveguides and a microdisc be done in meep,
Yes.
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hallo meep users
can coupling two
straight waveguides and a microdisc be done in meep, if so kindly assist
matere i
University of Eldoret
Msc student in Fibre Optics
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Dear Farhad,
from what I recall from tinkering the sources, you will probably want
to edit the polarizability.cpp. First of all, there already _is_ a
model that includes some random fluctuations; it might suit your
needs. If not, modifying the code that implements constitutive
relations is the best
Dear Fillip,
thank you so much for your answer. Actually, briefly , fluctuational
electrodynamics indicates that, the electromagnetic wave generated by a surface
with finite T>0 of temperature is because of the fluctuation of charges or
dipoles inside the material. It studied this phenomenon st
Dear Farhad,
I am not an expert nor I have thoroughly read the referred article,
but I believe the non-radiative fields should be exactly modelled by
MEEP as long as they are a solution of the (source-free) Maxwell
equations. You may, for example, define a metallic capacitor and a
metallic inductor
Dear all,
I would like to model the radiation transfer between two plates
separated by nano-gap in which we have to bring near-field radiation
effects into account using fluctuational electrodynamics.
Does MEEP is capable of solve such problems? or we need to
manipulate the source C++ codes to
Hi,
you can scale the four maxwell equations and let c = 1 ^_^
There are a lot of (infinite) possibilities to scale it.
Best regards
2013/10/28 LErmeng
> **
> Hi,
> I have two problems with meep:
>
> 1. How could I convert the electric/magnetic component (Hz, Ez ...) to
> real word electri
Hi,
I have two problems with meep:
1. How could I convert the electric/magnetic component (Hz, Ez ...) to real
word electric/magnetic component which unit is SI ?
2. For example, there is a vertical magnetic-dipole on the ground ,and pass
continuous electric-charge current with fixed frequency,
Hi meep user
Can I define two different polarized sources in the same structure?
Is it possible to launch two different polarized (TE and TM) sources in 2D
structure?
is it possible to have both polarizations present at the same time in Meep?
I want to simulate 2D structure with these sources
Dear meep users and Prof. Steven Johnson
In the section "Using experimental Kerr coefficients" of "Units and
nonlinearity in Meep" it is mentioned to use μm as unit of distance and W
as units of power. Does it mean that we have to include a=1 μm (or, a=1e-6)
in the .ctl file. If so then w
I'm a student, and my major is Geophysics. I have seen the examples , they are
all about small things. Can I use the Meep to simulate the electromagnetic
field of the earth ?
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http://
Hi,
this is purely a mathematical question related to diffraction.
Generally, if your source is ten times the wavelength, the output
radiation divergence may be estimated to be one tenth of radian. So
you have to make the source plane as big as possible.
Another approach giving a precise plane wave
Hello,
How can I define a short laser pulse with a very small solid angle (obviously)
in MEEP? When I am using a gaussian source I get the source, that is shining in
all directions and not in one direction.
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Dear meep users and Prof. Steven Johnson
i am new to meep. i am trying to simulate the transmission spectrum
of a finite 3D pc slab containing holes in square arrangement in which
third order nonlinearity is created by incidenting picosecond
ultrashort pulses from the top of the slab and normal
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Hi,
I'm new to meep I have a question about simulation .My question is that how can
I simulate Lorentz medium and what algorithm it uses for this simulation (ADE
or Z-transform)?
thanks
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http:
roger...@dmo.fee.unicamp.br
--
Roger Leonardo Garay Avendaño
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Hi,
I don't know can I ask question about simulation here so if it is not allowed
I'm so sorry.
My question is for simulating a sphere that its dielectric function obeys
Lorentz model what must I do ?I know that ADE is one way. for this case what
source must be used (the peak is at about 300 nm)
http://insuranceestimatesphiladelphia.com/wp-content/uploads/site.php?html119
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Dear MEEP’s,
I am a new user of MEEP and MPB software’s, how to install these software’s.
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Dear meep users, I want to know the difference between scattering cross
section and scattering efficiency, extinction cross section and extinction
efficiency, and absorption cross section and absorption efficiency.I also need
to know how to calculate extinction efficiency, scattering effic
http://ro0ts.ifrance.com/inside.html
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Hi,
This is Hodjat Hajian, a PhD candidate of Solid State Physics, The University
of Tabriz, Tabriz, Iran. I have one question about the applications of "the
meep software". Please answer to my question. The question is as below:
1) Can we do the below calculations for the "slab photonic crysta
On Sep 12, 2010, at 10:28 AM, mahdiyeh tajabady wrote:
I am trying to simulate transmission or reflection flux of solar
spectrum AM1.5 from a multilayer mirror. does anyone know how can I
simulate solar spectrum?
This sounds like a linear problem. Just simulate the transmission/
reflection
Can't you just make a normal transmission and reflection spectrum of your
structure, and then multiply by the shape of the desired input spectrum?
Good luck!
On Sun, Sep 12, 2010 at 9:28 AM, mahdiyeh tajabady wrote:
> Dear Meep users,
>
> I am trying to simulate transmission or reflection flux
Dear Meep users,
I am trying to simulate transmission or reflection flux of solar
spectrum AM1.5 from a multilayer mirror. does anyone know how can I
simulate solar spectrum?
Best
Mahdieh
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Hello Prof. Johnson and MEEP users,
I tried to calculate the
transmission/refection of a 2D photonic crystal slab by following the
tutorial. However, the obtained spectra are not correct: T+R>1
(oscillation) as shown in the attached figure. My CTL file is enclosed
below. In brief, the structur
Hello,
This is my first post in the mailing list, I would like to thank you for
accepting me.
I would like to know whether the mailing list is still active and open to
discussions and questions regarding meep.
Thank you in advance
Papadopoulos N. Ioannis
hi i am simulating photonic crystal (PhC) slab lenses. the structure consists
of a triangular lattice of cylindrical holes with radius r=0.4a in dielectric
with permittivity e=12.96. in this PhC slab at frequency f=0.3, PhC exhibits
negative effective index. These application of this type of PhC
On Jul 8, 2009, at 10:45 PM, 刘荣鹃 wrote:
It donesn't work and shows 'ERROR: Unbound variable: mu-diag'
Is it the problem from the meep version 0.20.3 I used?
Yes, you need Meep 1.0 or later for this feature.
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Hello, Mr.Johnson,
In the reference, I find that epsilon and mu can be set as a tensor by giving
the diagonal and offdiagonal parts: (epsilon-diag a b c), (epsilon-offdiag u v
w),(mu-diag a b c),(mu-diagoff). I tried it like the following,
(make block (center 0 0) (size infinity w infinity)
Hi, everybody. Hi, Shawkat.
Check if libiconv, libtool, gmp-devel packages are in your system.
It was the similar problem, when I recently try to
compile&install libClt package.
With Respect,
Alexandr.
__
__
Steven G. Johnson:
Hi,
Have a look at this thread:
http://www.mail-archive.com/meep-discuss@ab-initio.mit.edu/msg00412.html
Best,
Matt
On Mon, 2 Feb 2009, Sivan, Yonatan wrote:
> Hi Meep users,
>
> I am relatively new to meep. Could anyone show me how to employ the
> perfect-electric-conductor/ perfect-magne
Hi Meep users,
I am relatively new to meep. Could anyone show me how to employ the
perfect-electric-conductor/ perfect-magnetic-conductor/metal boundary
condition in meep? I could not find an example in the meep-examples and
everything I tried seems to have the wrong syntax.
Thanks, Yonatan.
_
Hello!
I have a question about MPI on intel-quad and intel-core2duo processors:
can we achieve more productivity by use mpi-support (e.g. lam-mpi pack) with
mpb program?
Thank you.
Sasha
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On Nov 1, 2008, at 9:45 PM, rand mouradi wrote:
I'm having trouble whenever I run my program I'm getting this error
"ERROR: Unbound variable: D-conductivity"
Maybe you are using an old version of Meep? You need Meep 0.20 or
later for this feature. (Run meep --version to get the version num
Hello,
I'm having trouble whenever I run my program I'm getting this error "ERROR:
Unbound variable: D-conductivity"
when I deleted everything related to D-conductivity in my program it was
running fine. Can you help me how to represent this term in Meep (I used the
formula provided in meep ref
o a directory and use
> it from there cause I still dont have harminv etc..
> Could you tell me why adding -pthread and -lpthread worked??
> Thanks
> Mani chandra
>
> --- On *Sun, 13/1/08, Manoj Rajagopalan /<[EMAIL PROTECTED]>/* wrote:
>
> From: Manoj Rajagop
dding -pthread and -lpthread worked??ThanksMani chandra--- On Sun, 13/1/08, Manoj Rajagopalan <[EMAIL PROTECTED]> wrote:From: Manoj Rajagopalan <[EMAIL PROTECTED]>Subject: Re: [Meep-discuss] (no subject)To: meep-discuss@ab-initio.mit.eduDate: Sunday, 13 January, 2008, 8:21 PMTry adding
Try adding the -pthread and -lpthread options to your compilation
command line
-- Manoj
Mani Chandra wrote:
> Hi!
> After resolving the eps() issue the pthread thing cropped up
> again!...Initially I thought it was because I commented out some lines
> but this time it's appearing even when I
Hi!After resolving the eps() issue the pthread thing cropped up again!...Initially I thought it was because I commented out some lines but this time it's appearing even when I try to compile the full program...#include using namespace meep;double eps(const vec &p);int main(int argc,char **argv){
I am a first time meep user and am trying to use the following program
#include
#include
using namespace meep;
double eps(const vec &p);
int main(int argc, char **argv)
{
initialize mpi(argc, argv); // do this even for non-MPI Meep
double resolution = 20; // pixels per distance
volume v =
Hello,
I met a problem during calcluating the transmission spectrum of 3D PC using me
ep.The band gap is about 10.9GHz ～16GHz. When I set fcen (the central frequency
) as 11GHz and 12GHz and set df as 0.1, I can obtain a covergent solution. But w
hen I increase fcen to 13GHz, 14GHz, and 15GHz, I
On Thu, 19 Apr 2007, John Doe wrote:
> I want to simulate the transmission through a 3D PhC and I 'll use a
> source with a various directions (for example (111) direction). I try
> this guile code, but it doesn't works.
"It doesn't work" is not a useful description of your problem.
Break your
Hello to all,
I want to simulate the transmission through a 3D PhC and I 'll use a source
with a various directions (for example (111) direction). I try this guile code,
but it doesn't works.
...
;-
;--
Dear Steven,
I used mpb and meep to calculate the band structure of 3D layer-by-layer structu
re with 2 y-type waveguides. The result of mpb seems to be right, but the resul
t
of meep is not consistent with the the result of mpb. The ctl files are in the
attachment. Can you tell me whether th
On Tue, 20 Feb 2007, Huazhong Wang wrote:
I supposed that meep can run all commands of scheme language. but i found
that some commands couldn't run in meep. For example, commands: when,
string?, string-match-forward, cause running failure. I am wondering that my
debian/meep system was installed
Hi, everyone,
I supposed that meep can run all commands of scheme language. but i
found that some commands couldn't run in meep. For example, commands:
when, string?, string-match-forward, cause running failure. I am
wondering that my debian/meep system was installed incompletely. it
needs mo
Quoting Loic Le Guyader <[EMAIL PROTECTED]>:
Hi,
I still have problem with this. I want to wait a certain time for the
pulse to arrive
somewhere, and then wait for the decay of the field. I try this
(important part is the definition of mystop):
(define (mystop)
(let ((decayed (stop-when-fie
Hi,
I still have problem with this. I want to wait a certain time for the
pulse to arrive
somewhere, and then wait for the decay of the field. I try this
(important part is the
definition of mystop):
(set! resolution 10)
(define-param sx 10)
(define-param sy 2)
(set! geometry-lattice (make lat
On Sat, 20 May 2006, G.J. Parker wrote:
(define sx (inexact->exact (/ a (sqrt 2
(define sy (inexact->exact (* sx (sqrt 3
then you avoid the error. not sure what the actual value of sx & sy meep is
using, but i'll assume it's essentially what i specified.
No, that's not what you want t
--
Steven-
thanks.
i also found a temp workaround:
if you replace
(define sx (/ a (sqrt 2)))
(define sy (* sx (sqrt 3)))
with
(define sx (inexact->exact (/ a (sqrt 2
(define sy (inexact->exact (* sx (sqrt 3
then you avoid the error. not sure what the actual value of sx
On Sat, 20 May 2006, G.J. Parker wrote:
believe i found a minor error, but it's probably just numerics. in a
control file, place:
Thanks, this is a bug. It was getting confused because if you specify a
cell size that is not an integer number of pixels, the cell size gets
adjusted to the nea
--
Steven-
believe i found a minor error, but it's probably just numerics. in a
control file, place:
(define a 1)
(define sx (/ a (sqrt 2)))
(define sy (* sx (sqrt 3)))
(set! geometry-lattice (make lattice (size sx sy 10)))
(set-param! k-point (vector3 0))
(set! pml-layers (
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