Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Simulation of basic surface plasmons
Posted 16 feb 2012, 06:14 GMT-5 RF & Microwave Engineering, Results & Visualization 12 Replies
Please login with a confirmed email address before reporting spam
This is what I did in the draw mode
imageshack.us/photo/my-images/51/drawm.png/
R2 and R4 is the dielectric, R3 is metal. R7, R6 and R5 is PMLs
R2 and r4 AND er value of 1. R3 has permittivity of -6
I have done the sub-domain settings right. What I do not get is the boundary conditions. Should the outer edge should be scattering Conditions? What about the inner edges? How do I implement the continuity condition? What other changes are required? Please help
The output I get is this
imageshack.us/photo/my-images/256/outputb.png/
Please login with a confirmed email address before reporting spam
1. For inner boundaries it is automatically continuity.
2. Scattering boundary works usually pretty well for mode solver and outer boundaries in the optical regime (I had good experience with it). You dont even need PML if you use it (in most cases...).
3. Your picture of the solution looks like you might be off with your Mode analysis frequency & the search value for the neff. You can find the setting for this under physics -> scalar variables (you can change to wavelength under physics -> Properties. And the neff you find under solve -> solver parameters.
-Niklas
Please login with a confirmed email address before reporting spam
Please login with a confirmed email address before reporting spam
Please login with a confirmed email address before reporting spam
from my understanding all inner boundaries are ALWAYS taken as continuity, IFF you are within the same physics, AND you are in Geometry "Union" mode.
If not, you might be on the external limit of one physics, in which case a boundary is external boundary for one, and continuity internal for another OR you are in "Assembly" geometry mode. Then ALL COMMON boundaries between grouped objects are dedoubled, and ther is NO default continuity. You must generate the pairs and apply continuity or whatever yourself
Hope I'm clear, this is one of the strengths of COMSOl but often overlooked by many users (applies to 3.5 AND 4 by the way) ;)
--
Good luck
Ivar
Please login with a confirmed email address before reporting spam
Please login with a confirmed email address before reporting spam
After simulation I got this.. But why is the light entering the dielectric in between. Should it not be like this?
img546.imageshack.us/img546/3599/poog.png
Thank you for the help
Please login with a confirmed email address before reporting spam
You should rather upload the images on the forum as not all of us have access to all external load servers
--
Good luck
Ivar
Please login with a confirmed email address before reporting spam
Please login with a confirmed email address before reporting spam
Then I could take a look at it.
Also even so Comsol Support is sometimes a bit slow, it is always worth sending them an email as well, they are usually pretty helpful.
Please login with a confirmed email address before reporting spam
This is the one given by my professor
www.mediafire.com/?tk4aqul5yt4ey9e
This is the one that I tried to simulate
www.mediafire.com/?a5h3js03u6gpy8q
I want to know why the light penetrates the dielectric surface when the plasmons are supposed to travel at the interface alone
Please login with a confirmed email address before reporting spam
1. Could you please use the upload function of this forum? And not upload the files somewhere else?
2. Instead of using the report, could you just upload the .mph file itself? (Clear Mesh & Solutions)
-Niklas
Please login with a confirmed email address before reporting spam
1. Mesh finer (refine mesh 1-2 times)
2. At the same time reduce the size of the simulation domain where you do not need it.
3. I am not sure about your scales, but from my feeling you dimensions with respect to the wavelength are off. The wavelength should be larger or the dimensions smaller, not sure what you are trying to do with this model? Is this a real physical system you are trying to model?
Doing this, I get some results (see file in the attachment).
Let me know if this is what you are looking for?
Also it seems the file problems you were having were related to firefox? I just had a similar problem, where attaching a file did not work with firefox, but the same file was okay with internet explorer....
Attachments:
Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.