Perhaps you are combining two or more mirror symmetries with periodic
boundary conditions in 3d? This may cause field instabilities as
described in: https://github.com/NanoComp/meep/issues/132. If this is
the case, try removing the mirror symmetries.
On 11/1/2020 13:28, Gui Max wrote:
Hello
I am trying to mimic a terahertz pulse (about 910GHz) signal measured from
a laser spectroscopy machine. The time-domain waveform has a unique shape
so I have to use CustomSource
(i.e. sources = [mp.GaussianBeamSource(src=mp.CustomSource). I obtained the
expression using MATLAB curve
Hello users,
I am a final year masters student.
In an experiment, I am using a small-loop-antenna to excite field in a
Loop-Gap-Resonator. The field of such antenna is given by the
expression:
E(r,theta)= exp(-ikr)sin(theta)/r
This field is in the phi direction and other components are zero.
tran quyet thang hereiam2005@... writes:
Dear professor Johnson and Meep users,
It has been mentioned multiple times that a capacity similar to variable
mesh size can be emulated in meep by applying the coordinate transformation
technique formulated in Coordinate Transformation
Dear professor Johnson and Meep users,
It has been mentioned multiple times that a capacity similar to variable mesh
size can be emulated in meep by applying the coordinate transformation
technique formulated in Coordinate Transformation
Invariance in Electromagnetism.
However my attempts in
dear meep users
suppose i excite the volume source with Ez component with unit length in y
direction then does it have cylindrical wavefront? which component of
electric and magnetic fields will be present?
ranjeet dwivedi
IIT KANPUR
___
Dear all,
I want to calculate the intensity inside of a phc cavity. Does anyone
know how a gaussian point source e-field is normalized? My idea is to
normalize the field strength inside of the cavity to the source and then
scale up according to the input laser.
Any other ideas are welcome.
On Tue, 2 Aug 2011 08:49:47 -0400, J. Steele Parris parri...@vcu.edu
wrote:
The tip is a 1x1x4 nickel block that has been cut to a pyramid point on
one
side and affixed to a nickel layer (1 unit thick) and a silicon
substrate.
There is also a thin layer of silver on the pyramid point of the
Okay, I feel that I have solved the issue. It was multi-faceted:
1) When I was probing the h5 file with h5totxt, I was reading data from a
wrong point (should've been at -x60 -y11 -z11, not -y0 -z0).
2) Also, when using output-efield, there are 3 different datasets (x, y,
z) which the h5totxt was
The tip is a 1x1x4 nickel block that has been cut to a pyramid point on one
side and affixed to a nickel layer (1 unit thick) and a silicon substrate.
There is also a thin layer of silver on the pyramid point of the tip.
On Mon, Aug 1, 2011 at 6:26 PM, gpipc gp...@cup.uni-muenchen.de wrote:
On
Hello fellow Meep users!
I am measuring the enhancement of the electric field at the tip of a nickel
nanotip with a silver coating on top. When I measure and compare to a blank
field, the enhancement is 10^13. I find this improbable, and I ask the
community for any advice on the matter.
To
On Mon, 1 Aug 2011 14:51:38 -0400, J. Steele Parris parri...@vcu.edu
wrote:
Hello fellow Meep users!
I am measuring the enhancement of the electric field at the tip of a
nickel
nanotip with a silver coating on top. When I measure and compare to a
blank
field, the enhancement is 10^13. I find
Thanks for your help
Onder
Message: 1
Date: Fri, 24 Dec 2010 16:13:19 -0500
From: Steven G. Johnson stevenj@gmail.com
Subject: Re: [Meep-discuss] field synchronization
To: meep-discuss Discuss meep-discuss@ab-initio.mit.edu
Message-ID: 24baab40-fa99-4af7-9122-b5361d1a4...@fftw.org
Content
Hi meep users,
I have two sources in my structure.
One of them is Ez field, the other one is Hz field.
I want to get fluxes with add-flux function.
In wiki page, fields are synchronized automatically in flux-in-box and
field-energy-in-box routines. But I am using add-flux function to get
fluxes.
On Dec 24, 2010, at 3:40 AM, Özgür Önder KARAKILINÇ wrote:
So, should I do synchronization of fields when I use add-flux
function ?
No, the Fourier transforms in add-flux automatically multiply the
fields by the phase for the correct times; no synchronization is needed.
On Sep 23, 2010, at 6:56 AM, Özgür Önder KARAKILINÇ wrote:
I have 160x160 matrix dataset
I think, row number indicate x-axis direction, column number
indicate y-axis direction
Is it right?
Yes. (You could easily check this yourself just by making a non-
square computational cell.)
I want to get electric field intensity profile along the waveguide axis
(for example each point in x direction )
How can I do?
in meep reference, (get-field-point c pt) function is used for single point.
I need field intensity-position graphs.
Maybe, I should write script to get intensity at
On Sep 16, 2010, at 4:14 AM, Özgür Önder KARAKILINÇ wrote:
I want to get electric field intensity profile along the waveguide
axis
(for example each point in x direction )
How can I do?
in meep reference, (get-field-point c pt) function is used for
single point.
I need field
Hello Everyone,
I would like to compute the near field enhancement within a plasmonic cavity
(acted on by a continuous wave source). When outputting a component of the
electric field (ie. E(r)) is this simply the amplitude corresponding to the
real part of the electric field in arbitrary units? I
Dear Steven and other Friends,
I met a problem.
I calculate the transmittance of W1 PhC waveguide. I randomly change
the radius of each air hole.
To varify the correction, I have added a monitor at a single point to
observe the feild at the output.
I
Dear all,
I simulate a structure made from dielectric (without active material). I use a
pulse and put PML at all sides, but the field blew up at last. (set!
eps-averaging? false) can't help. The version of meep is 0.10.1.
Could you help me? Thank you in advance.
Li
On Jun 21, 2009, at 8:58 AM, phcgroup wrote:
I simulate a structure made from dielectric (without active
material). I use a pulse and put PML at all sides, but the field
blew up at last. (set! eps-averaging? false) can't help. The version
of meep is 0.10.1.
Have you tried a more recent
Please, I need good advice. Let me to show my problem closer. You can see
(enclosed), how my initial magnetic field from static analysis looks.
It is non-continous, because the current source is present in it. I can get the
magnetic intensity Hx, Hy values only in nodes. I have regular mesh
Hello,
please help me. I would like to start my Meep computing with initialized
magnetic field
and I do not know, how to do it. I do not understand this:
http://ab-initio.mit.edu/wiki/index.php/Meep_field-function_examples
I can translate Hx, Hy (intenzity of magnetic field) from static
2D
I also met this problem before.
If your structure is so large and calculation time is too long, you should
activate non-averaging to avoid divergence issue just like;
(set! eps-averaging? false)
Quoting dy zhao [EMAIL PROTECTED]:
Dear Dr. Steven and meep users,
Recently, I have met the
Dear prof. Steven Johnson and meep users:
I am reporting a problem of field blowing out. This may be a similar problem to
the reports of Andika Asyuda in September or Jefferson
Thomas in July. As I do not see their solutions, this problem may be a
limitation of current meep applications. I
Thanks. One more thing about adding the sources in case of symmetries :
If I have a box of sizes 4, 4, 4 with odd symmetry on X and I want to add
a source with Ex with
f.add_point_source(Ex, src, vec(1, 1, 1), 10); where 10 means
the amplitude
then as far as I understand I have to add a
Hi Steven,
What you are saying is really very helpful. In fact I had no idea I
have to supply the symmetric
source. I will try it right now and see how it goes.
On the other hand I dont understand the thing with the symmetric eps.
Although I dont know how meep works internally with the
On Jul 30, 2008, at 9:20 PM, Jefferson Thomas wrote:
What you are saying is really very helpful. In fact I had no idea I
have to supply the symmetric
source. I will try it right now and see how it goes.
See: http://ab-initio.mit.edu/wiki/index.php/Exploiting_symmetry_in_Meep
If you don't
You are right. When I symmetrized the eps function the divergences disappeared.
I really didnt know that this one last pixel could have such a big influence.
I have also some other kind of divergences in other cases. They seem
not to be connected
to symmetries but arise from PML layers. I am
Your problem seems to stem from the fact that neither your structure
nor your sources obey the symmetry you specified.
On Jul 22, 2008, at 9:40 PM, Jefferson Thomas wrote:
meep::symmetry S=meep::identity();
S = S+ meep::mirror(meep::X, v)*(-1); /// Introducing symmetries
on X and Y
On Jul 16, 2008, at 10:11 PM, Jefferson Thomas wrote:
- exciting with one gaussian_src_time with freq 0.7, width 3.0 for the
Try using a narrower-bandwidth source centered on your mode
frequency. That will also help harminv out, in that with a narrower
bandwidth source harminv has cleaner
On Mar 14, 2008, at 6:04 AM, shiv chawla wrote:
(set! Courant 0.95)
In two dimensions, the Courant factor needs to be sqrt(1/2) for the
simulation to be stable, as described in the introduction chapter of
the Meep manual.
___
meep-discuss
On 17/07/07, Steven G. Johnson [EMAIL PROTECTED] wrote:
till some value and then blow up. I tried to experiment a bit, and I
have
figured out that the process can be made stable by disabling subpixel
averaging (I hope the following table could be usefull):
Yes, right now the subpixel
Dear Tjeerd, Steven and other meep users,
I am calculating a transmission spectrum through 2D photonic crystal and
I expirienced with the same problem.
For some parameters and when the structure is present I cannot get the
fields to decay, while normalization run is OK.
If length L is set to 16
Hello all,
I'm simulating PhC resonators by launching pulses into the system. Like
in the bend waveguide example I put a field measurement at the output to
make sure that the fields at the output are decayed enough. I put the
decay value to 1e-3.
The fields generally tend to decay first, but
Hi everyone. I found a strange problem with metal-dielectric structure. On my structure ctl file, the surface field blowup in pml. I set the frequency 0.55 and Wp = 1. Meep version is 0.9.==
(set! geometry-lattice (make lattice (size 8 9 7)))(set! geometry (list (make block (center 0 0 0)
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