[On behalf of John Weiner, I forward his experience with installation
of MEEP on Mac OS. John's kind contribution follows. -- Filip]
Dear Meep Users and Developers,
I have been able to install meep-1.3 on two different iMacs (one in
Washington DC( Sierra 10.12.5) and the other in Paris (Sierra 10
Hi, would you please describe to all what is the reported issue with
the TE mode?
Filip
2017-01-19 11:00 GMT+01:00, Aliasghar Sedghi :
> Dear meep users,
> I have calculated the band structure of PCs composed of metallic rods
> (Drude model) embedded in an air background using meep. There is no
>
. I should be able to run the interactive
> commands at the start of the tutorial:
>
> http://ab-initio.mit.edu/wiki/index.php/Meep_Tutorial
>
> - - - -
>
> (set! geometry-lattice (make lattice (size 16 8 no-size)))
>
> (set! geometry (list
> (ma
Hi, assuming you are able to compute a time-domain simulation of the
metamaterial unit cell, there should be no big problem to 1) resolve
the resonance frequencies of each mode, then to 2) switch to a
narrow-band source with the actual frequency of the mode you are
interested in, 3) record the elec
Excuse my little advertisement, but here I have written script that
compiles the freshest version of MEEP on your Ubuntu system:
https://github.com/FilipDominec/python-meep-install/blob/master/python-meep-install.sh
It was tested on many systems and it should work out-of-the-box also
on your versi
Hi, since MEEP uses relative permittivity and permeability which have
no physical dimension, there is no need to convert units.
Filip
2016-09-16 22:43 GMT+02:00, Heligman, Daniel M.
:
> Hi,
>
>
> I have a simple question. Is the a conversion between SI and meep units for
> permittivity and perm
time.
> Other computational tools are running normally, for example matlab, I have
> not seen any performance drop after the Ubuntu upgrade.
> Best regards,
> Jisha
>
>
> On Thu, Sep 1, 2016 at 2:13 PM, Filip Dominec
> wrote:
>
>> Hi,
>> 1) Do you use multiprocessi
Hi,
1) Do you use multiprocessing? If so, which implementation, MPICH or OpenMPI?
2) Do you use HDF5 export? If so, which kind of HDF libraries,
MPI-enabled or "serial"? The latter is known to be very slow when used
in multiprocessing setup, though they should not alter subpixel
averaging.
3) Did
omething wrong?. Is there
> any workaround to get the values of the ldos calculation in Python-Meep or
> Scheme or C++ interface for MEEP are needed to get them?. Anyone tried this
> before?.
>
>
> Thank you in advanced for any help!
>
> Eduardo
>
Dear Craig,
if I do not miss something, you may easily define a (perpendicular or
even oblique) plane wave source as shown in
https://www.mail-archive.com/meep-discuss@ab-initio.mit.edu/msg03088.html
F.
2016-08-26 7:51 GMT+02:00, Craig Milde :
> Hi meep discussion list,
>
>
> I am attempting to s
Dear Craig,
from your e-mail it is not clear what steps you actually tried to
extract the field data from the HDF file. Can you run, e.g., this?
h5tovtk input.h5 -o output.vtk
paraview output.vtk
You should be able to add some monitor plane in paraview and browse
the field records as you wish.
Fi
Dear Saket, just define the source amplitude as a harmonic function,
with the periodicity corresponding by the desired transverse component
of the wave vector. Filip
2016-07-27 21:03 GMT+02:00, saket wankhade :
> Dear meep users,
> I need a tilted plane wave source with both E
Maybe it helps somebody if I mention that the python-meep interface
solves the previous questions, since
1) each individual time step is accessible within a cycle (see
https://github.com/FilipDominec/python-meep-utils/blob/master/scatter.py#L88),
and
2) for every point in the grid, MEEP calls a
Hi, I would rather guess the images Saket gets are really full black,
which would mean that there are "NaN" values in the output of the
computation. This may result from some numerical instability. I suggest
to try first to halve the simulation time until the field gets finite.
Then one can det
Hi, whenever you set the phase in either the Y- or Z- symmetry to -1,
the simulation eventually becomes unstable. I have tested out all four
combinations for you, and I can tell that only (set! symmetries (list
(make mirror-sym (direction Y) (phase 1)) (make mirror-sym (direction Z)
(phase 1)))
Hi, it is directly in
http://ab-initio.mit.edu/wiki/index.php/Meep_Reference, search for
"resolution". The higher, the finer mesh.
Filip
On 11.2.2016 06:07, saket wankhade wrote:
Dear meep users,
I know meep uses uniform meshing but want to change size of it.Is it
possible to change m
works and for 8 processors it
> doesn't appear, so I'm guessing it is not working. I couldn't check if
> it's affecting my results yet.
>
> Pablo.
>
> El 21/09/15 a las 19:36, Filip Dominec escribió:
>> Dear Pablo, how exactly does the bug manifest? Can it
Dear Pablo, how exactly does the bug manifest? Can it be observed on
the exported permittivity, e.g. in Paraview? Or does the simulation
lose its sub-pixel precision with regards to some structure parameter?
Filip
2015-09-21 19:28 GMT+02:00, Pablo Díaz Núñez :
> Dear meep users,
>
> I have encount
Dear Amin,
I am afraid your question should be better searched/posed e.g. in
http://physics.stackexchange.com/ rather than to the MEEP community.
Your question has multiple answers depending on the point of view.
1) The most straightforward is that Maxwell equations have some
solutions and extreme
Dear Steve,
1) before we involve in changing the source amplitude: Analysing the
high-quality cavity ringdown by time-domain method running the whole
time is *extremely* wasteful. In fact, the "harminv", or "filter
diagonalization method" was designed to solve exactly this problem:
from a short sa
Dear Vladimir, search for the variable 'chi2' in the code, it is used
in multiple files. The actual computation of its physical effect
should be in step_generic.cpp
Filip
2015-07-22 23:05 GMT+02:00, Владимир Борисович Новиков
:
> Dear all,
> Please show code place in https://github.com/stevengj/me
Dear Nicolas, I guess the optical and mechanical processes happen at
completely different time scales (picoseconds to microseconds at
least). Perhaps the simplest way is to re-iterate multiple separate
simulations, with each simulation's structure being defined by the
result of the previous simulat
Hi, Alshikh,
from what I understand, you shall introduce another callback function
like your eps_bragg(const vec &pt), which will return the value of
the Kerr coefficient. It should be called in a similar manner as e.g.
the susceptibilities are.
I always found it useful to test out the Kerr nonli
Dear all,
in 2015, there have been numerous reports of MEEP not compiling with
HDF5 on Debian Jessie and newer versions of Ubuntu [1,2]. This
happened due to a known change in the system [3].
After a longer trial-and-error, I found the required change in the
LDFLAGS variable so that I can compile
Dear all, I am, too experimenting with this issue at the moment. You
can clone my repository with the installation scripts for the latest
python-meep from: https://github.com/FilipDominec/python-meep-install.
The advantage of using git is in clarity: Every modification of the
installation procedur
Dear Vladimir and all interested,
to my knowledge there is no precompiled MEEP of the version 1.3 for
Debian-based systems. Version 1.2.1 has been readily available for
over a year thanks to Thorsten Alteholz.
I prepared a compilation script, and planned to package the very
latest MEEP and Python-
Dear Shin-Woong,
I did not compile your code, but I have few thoughts:
1) First, the material should be tested on a half-space, not a slab.
The latter combines "too much physics", i.e. the Lorentz-Drude model
with a pronounced Fabry-Pérot interference (which is moreover
modulated by the dispersion
ds or something, why do the transients take so long to die out.?
>>
>> The attached repo contains a _test.ctl file with my code and graphs in the
>> _test-out/ folder.
>>
>> https://github.com/eoinmurray/meep-test.git
>> <https://github.com/eoinmurray/meep-test.g
would like to have it propagate in only one particular
> direction (think of an experiment where you sign a laser light on a metallic
> nanoparticle).
>
>
>
> Thanks for your time and help.
>
> Amrit
>
>
>
>> On May 1, 2015, at 3:02 PM, Filip Dominec
>> wro
Dear Amrit,
I deduce you are interested in _oblique_ incidence of the plane wave.
Perhaps the optimum solution would be to freely rotate the source
object in space; however to my knowledge this is not possible.
It is however relatively easy to make a source emit with a transverse
component of the
Dear Hamza,
from what I know you need to run a loop of the simulations; this is
probably accomplished the best through a loop in a bash script; the
scheme interface accepts command-line parameters as can be found in
numerous examples. As an example in python-meep, I just uploaded
https://github.com
>From my personal point of view, MEEP is mostly used for scientific
research rather than engineering. Most simulations therefore deal with
complicated physical interpretation of rather simple structures. The
highlights of MEEP are the possibility to defive various physical
phenomena and its scripti
re, with its full log output on the current
cleanly installed system, is at:
https://github.com/FilipDominec/python-meep-install
Filip
2015-03-25 4:05 GMT-04:00, Filip Dominec :
> Hi,
> it is as you write, and therefore I would like to make the blue-boxed
> installation failsafe on as
Dear Pierre,
I observed similar mode splitting (from intended circular symmetric
structures) when my simulations had too coarse a resolution. How the
results change if you halve or double the resolution?
You could also launch the frequency-domain solver to identify the
detected two modes.
Filip
Dear Pierre,
I observed similar mode splitting (from intended circular symmetric
structures) when my simulations had too coarse a resolution. How the
results change if you halve or double the resolution?
You could also launch the frequency-domain solver to identify the
detected two modes.
Filip
ure
> a smooth startup.I am about to test that.
>
> I did try to use the frequency domain solver, but it ran for hours and
> failed to converge. I don't know what that signifies.
>
> Cheers
> Gib
>
> From: Filip Dominec
Hi, Gib,
it appears there are two resonant modes relatively close in frequency
(separated by 1/4 of their center frequency, as you wrote). You may
wish to set the 'width' to some reasonable value so that the spectrum
of the source is narrower.
http://ab-initio.mit.edu/wiki/index.php/Meep_Reference
Hi, Glenn,
in my experience, the speed of light and generally the results in MEEP
are quite accurate (compared to theory, other methods or experiment)
until the wavelength becomes comparable to several voxels - in which
case however also the structure ceases to be described correctly. Thus
I believ
case NO_DIRECTION: break; // no stride here, either
> }
> }
>
> 2015-03-26 20:07 GMT+03:00 Filip Dominec :
>> As far as I understood the source, the 'stride' represents how much
>> bytes in the computer memory shall be skipped to get to the voxel in
>&g
As far as I understood the source, the 'stride' represents how much
bytes in the computer memory shall be skipped to get to the voxel in
the neighboring row.
More readable, but perhaps less efficient, implementation would be to
address the voxels as a 2-D or 3-D array.
Is this correct?
Filip
2015-
uide. It is like a Y shaped PC
> waveguide. Now I want to calculate , how much time the device will take
> responds to the input signals ?
>
>
> Nirmala
>
> On Thu, Mar 26, 2015 at 12:35 PM, Filip Dominec
> wrote:
>
>> Hi, Nimala,
>> perhaps it is possib
Hi, Nimala,
perhaps it is possible. Could you specify your task in more specific
words, please?
The custom source can be easily found on the net, e.g.
http://comments.gmane.org/gmane.comp.science.electromagnetism.meep.general/3936
Filip
2015-03-26 3:57 GMT+01:00, nirmala dsouza :
> I want to calcu
b/x86_64-linux-gnu/libhdf5_cpp.a
> /usr/lib/x86_64-linux-gnu/libhdf5_openmpihl_fortran.so.8
> /usr/lib/x86_64-linux-gnu/libhdf5_serial_fortran.a
> /usr/lib/jni/libjhdf5.so
>
> I also tried to add the libraries separately with:
> export
> LD_RUN_PATH="/usr/local/lib/:/usr/li
arying the frequency. It would be great
> if you could point me to an example .ctl file that executes multiple
> simulations, creating file names appropriately.
>
> Thanks
> Gib
> ________
> From: Filip Dominec [filip.domi...@gmail.com]
> Sen
evengj/meep
>
> Gib
> ________
> From: Filip Dominec [filip.domi...@gmail.com]
> Sent: Thursday, 19 March 2015 12:05 p.m.
> To: Gib Bogle
> Cc: meep-discuss
> Subject: Re: [Meep-discuss] Frequency-domain solver
>
> Hi, Gib, perhaps I was a bit confused. The fact is
1.2.1.tar.gz from
> http://ab-initio.mit.edu/wiki/index.php/Meep_download in January this year.
> This claims to be the latest release - is this not the case?
>
> Cheers
> Gib
> ________
> From: Filip Dominec [filip.domi...@gmail.com]
> Sen
Hi, Gib, it looks exactly like the bug that has been resolved in git
commit
https://github.com/stevengj/meep/commit/0640e9f6a2ccfa2a40375a89b5692ebb1fb87efb
Could you check a recent version of MEEP either compiling it from
source (blue box in http://f.dominec.eu/meep/index.html#install), or
insta
Hi, Julián,
your script works for me. I get the same result from 1- and 2-process
simulation.
I have h5utils in version 1.12.1, and freshly-compiled meep 1.2.1 &
python-meep according to the blue box at
http://f.dominec.eu/meep/index.html#install
Could you somehow examine the sample.h5 file? Its
Dear John,
I can not confirm not deny your approach is correct.
I use another way to get the incident/transmitted/reflected fields
from a structure in free space. Most importantly, it provides also the
phase information, and also allows to get all the reflection and
transmission coefficients in si
Hi, Saeid,
your task has been perhaps done by somebody else, please take a look at
https://timsaucer.wordpress.com/2013/04/30/building-l3-photonic-crystal-cavity-in-meep-1-finding-mode/,
http://comments.gmane.org/gmane.comp.science.electromagnetism.meep.general/10,
http://osdir.com/ml/science.elect
Dear Jim,
this seems to be a result of instability, resulting in saturated (i.e.
infinite or NaN) values as you suggest.
To verify this, you may shorten the simulation until you get some
image that is not plain black. As a matter of fact, the instability
does not occur instantly, but it takes it se
Hi, currently I do not have the example you mention, but surely you
can make a focused beam from an oblique beam, by introducing a
*quadratic* term into the imaginary part of the exponential that
defines the source amplitude.
If you wish to build a focused *gaussian* beam, you will also wish to
mod
Hi, if you properly divide the reflected amplitude by the incident
amplitude, the reflection of a linear system should indeed be the
same, independent of the source duration and spectrum.
If it is not, one possible cause may be that you clip the time record
while the source was still running, or th
Dear Liu,
from the principle of FDTD computation, there is no other way how to
define complex refractive index than to include dispersion. Either you
may introduce a Drude term (conductivity), or some high-frequency
Lorentzian.
More details are here:
http://ab-initio.mit.edu/wiki/index.php/Material
Thank you, Glenn, great job.
I will be happy to add a link to your post!
Filip
___
meep-discuss mailing list
meep-discuss@ab-initio.mit.edu
http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
, I tried multiprocessing on single node too. And the problem persists.
> Is it a common problem with meep multiprocessing?
>
> Thanks and Regards,
> Ratnesh
>
> -Original Message-
> From: Filip Dominec [mailto:filip.domi...@gmail.com]
> Sent: Tuesday, December 02, 2014 3:41 P
If my current run is successful I want to calculate forces
> around the outside of the modeled resonate cavity. I am hopeful that
> Meep can detect forces caused by evanescent wave momentum and if so, I
> will be a long way ahead of game. I appreciate your continued support.
>
> S
Dear Steve,
1) Use the value of 2.3. The static permittivity is invariant to scaling.
2) If you wanted to model realistic copper, with scaling of 1:1e6, you
would have to feed MEEP with values normalized to the scaling (1e6)
and also by the speed of light (2.998e8). For instance, the physical
Lore
ence, Pilani
>
> On Wed, Nov 19, 2014 at 9:04 PM, Filip Dominec
> wrote:
>
>> Dear Rajath,
>> it pretty much looks like missing- or incompatible version of libhdf.
>> Have you tried the compilation procedure from this site?
>> http://fzu.cz/~dominecf/meep/index.h
I am convinced that it would be more convenient if MEEP allowed one to
use the true SI units. (Thanks to the terahertz time-domain
spectroscopy, I can directly compare data from simulation and from our
laboratory.) The current approach of normalized units is however just
a formal complication and i
Hi, Farhad,
generally both the continuous and the narrow-band-gaussian sources are
good choices. Note however that for mathematical reasons a source
short in time will always have a broad spectrum. Spectral selectivity
has to be paid with computation time.
Fortunately, the Fourier transform of a g
Hi, Sophia, as far as I know, it is possible to overlap any material
with PML. The PML condition however applies for the whole boundary, so
it can not be defined in its part only.
Note I had some numerical stability issues when the PML was defined on
one axis only while the other boundaries were p
Hi, Joshua,
I am not sure if it will be helpful to you, but two years ago I wrote
a similar simulation of complex scattering coefficients
(reflection+transmission) from a SRR or any other metamaterial unit
cell.
The codes are in python-meep and are publicly available at
https://github.com/FilipDom
Hi,
1) spectrum: although the gaussian source with frequency around
(1/1.55) would give an approximate result, you probably want to use
the band_src_time which is described here:
http://fzu.cz/~dominecf/misc/meep/index.html#bandsource
I am going to contribute the code to github today.
2) If you wi
uge
positive imaginary part, it is a inductance-free conductor with tiny
resistivity, again --> PEC. Complex infinity has no sign.
Hope this helps,
Filip Dominec
IOP ASCR, Prague
2014-06-19 14:07 GMT+02:00, Weiner John :
> Dear meep users and experts:
>
> I am really stuck, and I need your
NSHA#". The capitals look
like shouting, and the hashmarks look like something as banging your
fist on the table before and after saying it...
Regards,
Filip Dominec
2014-06-12 18:01 GMT+02:00, #SHAMPY MANSHA# :
> Dear Steven and other Meep users,
>
> I am doing a simulation in whic
Hi, as a simplest approach, I would suggest to reduce the 'sigma'
parameter of the metal, first. It should allow the transmission to be
adjusted even in the case of a low resolution.
Filip
2014-05-26 7:06 GMT+02:00, jayv :
> I need some beam splitters with varying T/R ratios, and I've had some
> s
Dear Thomas and all,
I wrote most of my thoughts on the referred page; while sometimes the
discrete Lorentzian oscillators suffice to precisely describe the
dielectric function in the frequency range of interest, the optical
spectra of semiconductors are usually of the harder cases.
You can manual
If I correctly understand your question, you wish to define material
properties as an arbitrary function of frequency.
This is generally not possible in FDTD, see e.g.
http://ab-initio.mit.edu/wiki/index.php/Dielectric_materials_in_Meep
Filip
2014-05-13 19:07 GMT+02:00, Charalampos Mavidis :
> Hel
Hi, Sophia, from my personal experience, the dispersive material can
overlap with PML in the simulations.
The question of stability under such conditions may be quite hard,
though. You probably have to find out by trying which parameters are
stable - and which not.
Regards,
Filip
2014-05-07 12:07
Dear Allen,
surely the best guide for defining the Lorentzian model for materials
in MEEP is
http://ab-initio.mit.edu/wiki/index.php/Meep_Tutorial/Material_dispersion
where also a working example is presented.
I must apologize for the statement that you have to use a
low-frequency Lorentzian oscil
Dear Allen,
If I correctly understand your question, the Drude model can be
approximated by the polarisation coming from a Lorentz oscillator with
as extremely low resonance frequency. General approach is to select a
realistic plasma frequency (for instance, omega_p := 2*pi*3.64e15
rad/s for alumin
Hi, jayv,
the real and imaginary fields should be the same except for that the
imaginary part if shifted by 1/4 of its period. Thus computing the
modulus of the complex fields you get a smooth, non-oscillating
function, describing the magnitude of the field amplitude.
I think you can disregard the
Hi,
you can probably set the source cutoff to 0
(http://ab-initio.mit.edu/wiki/index.php/Meep_Reference#source).
(But I must admit that I do not understand the purpose to do this.)
F.
2014-04-23 22:13 GMT+02:00, James Green :
> Dear MEEP users,
>
> Does anyone have any idea about how to make a ga
This appears exactly as the result of the said effect.
The good point is that the gaussian source shape is reasonably
preserved upon differentiation, so you may pre-compensate it by
"fcen=0.40".
Or, if you have tighter requirements on the source, you may use the
newly implemented feature of band-so
May it be attributed to that the radiated field is a derivative of the
current, so that high-frequency components are enhanced compared to
the lower frequency ones? Or is it a more complicated deviation?
Regards,
Filip
2014-04-22 16:01 GMT+02:00, Ehsan Saei :
> Dear Steven and MEEP users,
>
> I si
the Fourier-transformed fields in the same cross-section.
> This is certainly do-able to implement (at least for dispersionless
> materials).
>
> On Apr 14, 2014, at 5:21 PM, Filip Dominec wrote:
>
>> This is true - I mostly simulate the behaviour of an infinite periodic
>> arr
Another option would be to define an amplitude-recording-plane: for
instance, knowing the Ex-field and Hy-field, one can easily separate
the amplitudes of both forward- and backward-propagating waves along
the z-axis. The usual scattering problems with properly absorbing
boundaries then require onl
Dear Ehsan,
on Linux, you can use the 'tee' command:
mpirun -np 8 meep-mpi test.ctl| tee test.out
Did it help?
Filip
2014-04-10 8:39 GMT+02:00, Ehsan Saei :
> Dear all,
>
> I try to run a ctl file using meep-mpi on a ubuntu machine with the
> following command line:
>
> mpirun -np
Dear Arthur,
thank you for sharing your code! I cloned your source, downloaded the
meep 1.2.1 sources and copied your files over the original directory.
Then I used my old compilation procedure on Ubuntu [1] to compile meep
and rebuilt the python-meep interface.
The new functions of snapshot() an
Hi, it appears to me that harminv may not use the MPI synchronisation
at its end. If this is the case, it could result in a race condition,
when one instance of harminv ends the multithreaded program, while the
second one is still running.
I suggest to add some field-manipulating function at the
Dear Pablo,
I plot the Lorentz model for silica at http://fzu.cz/~dominecf/misc/eps/#SiO2
The page also contains the numerical data for the Lorentzian
oscillators, along with additional information about the sources and
application of the data.
Hope this helps,
Fillip
2014-02-26 13:14 GMT+01:00,
simple task.
If there is coupling of freely propagating wave to any waveguide, the
task becomes a bit more complicated and a sketch of your geometry
would be needed.
Best regards,
Filip Dominec
2014-02-13 16:44 GMT+01:00, ISAAC MATERE :
> Hi meep users
> am trying to come up with a script for
Dear Simon,
I think your conjectures are all correct. The pseudo-gaussian spectral
profile (I guess the spectrum is more precisely ~ f*exp[-(f-fcen)**2 /
fwidth**2] or something like that) requires a gaussian time evolution
of the source. The cutoff defines sharp edges in time when the source
start
t how can I include the effects of
> temperature on the emission of the EM wave from a surface with a finite
> temperature?
>
> Thank you again. sorry if my message is long.
>
> Farhad
>
>
>
> On Monday, January 6, 2014 5:50 PM, Filip Dominec
> wrote:
>
> D
implemented in MEEP successfully so even this can be done.
The article touches a quite interesting topic, by the way.
Best wishes,
Filip Dominec
2014/1/6, FARHAD KAZEMI :
> Dear all,
>
> I would like to model the radiation transfer between two plates
> separated by nano-gap in which we h
Dear Prem,
as far as I know, this task would require either
1) to build the desired structure by overlapping a big (potentially
infinite) number of overlapping blocks,
or
2) load the structure pixel-by-pixel either from a data file, or from
a mathematical expression.
I spent several days implementi
Dear Farhad,
I must admit that maybe I do not fully understand your question, but anything
is predicted by Maxwell equations should be possible in MEEP. In many cases my
computations required MEEP to take into account the non-radiative electric or
magnetic fields (such as when building a split-r
consumes CPU time!
Some remarks on the materials in MEEP and FDTD stability is also here:
http://fzu.cz/~dominecf/misc/meep/#mat_mod
Regards,
Filip Dominec
On Fri, 20 Sep 2013 15:55:50 -0700
Rui La wrote:
> Dear meep users,
>
> I want to study the short wavelength light(300-700nm) pr
Hi, Rui,
I also always need to compute it from the basics.
25 nm corresponds to 0.25 units, therefore one unit corresponds to 1e-7 m,
400 nm is roughly 700 THz in reality, therefore you would rescale the
frequency to 700e12 * 1e-7 = 7e7,
but MEEP defines speed of light as 1 instead of 3e8 m/s, so
Dear Lin,
for better illustration of what actually happens, could you generate
the images again with the source shifted downwards, e. g. to 1/4 of
the picture height?
Thanks,
Filip
2013/7/9, nw...@mail.sim.ac.cn :
>
>
>
>
>
>
>
> Dear meep users
>
> I'm a student of CAS(Chinese Academy of Scie
Hi, John,
other people have asked a similar question and I am afraid it is not
implemented yet.
It is one of the features I proposed to implement in the mail few weeks ago:
http://permalink.gmane.org/gmane.comp.science.electromagnetism.meep.general/4959
However, I did not get any reply so far, the
Just for comparison,
these are some spectra recorded using the old Gaussian source:
http://fzu.cz/~dominecf/misc/meep/img/ampli_debug_gaussian.png
The structure couples to the low frequencies and induces ugly
artifacts by spectral leakage.
And here are those obtained using the band source with wid
Dear MEEP users,
let me share a little code snippet with you. Sometimes it happens that
one wants to run a FDTD simulation with a broadband source, which
however avoids some frequencies. A single gaussian source is not
useful in such case, as its spectrum has always broad wings. Composing
the sourc
Dear all,
this is an additional thought following my previous e-mail. Many
interesting functions have been already implemented in different free
FDTD codes. Just few examples of "special capabilities":
* MEEP implements interesting physics and frequency-domain solver,
* EMTL uses sub-pixel smoothin
Dear MEEP developers and users,
in our team, we employ MEEP to solve various problems and it is very
useful. However, now and then we encounter some important functions to
be missing. Most of them may be somehow written in Python code, but
they would be the most efficient if hard-coded in the C++ s
Dear Gholamhosain,
the permittivity has to be established from experimental (or
quantum-mechanical) sources, see for instance
http://xplqa30.ieee.org/ielx5/5503869/6055237/6004802/html/img/6004802-fig-2-large.gif
This graph may be easily converted to numerical data using Engauge or
similar program
And I forgot to add that
n = real(sqrt(eps))
k = imag(sqrt(eps))
F. D.
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Hi, Oscar, this is rather straightforward. The dielectric function
used by MEEP is given by the well-known Lorentz formula. (I have
verified it numerically, but this is a bit longer to explain.)
In Python, I use the following function for the material. As an
example I will give the SiO2 definition
with Physical simulations using NaCl,
> but I'm no expert in this technology.
> We can discuss issues with Google developers which are very supportive, if
> you got interested in the project.
> I can't port MEEP to this technology by myself, but with some help, I think
&g
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