thanks for your useful website. i simulate Au-nanoparticle on the silica microsphere but in subdomain setting when i choose the refractive index of nanoparticle( n-j*k ),comsol give me an error.what is the problem?
I am glad it helps.
go to solver parameters/Advanced and check "Use complex functions with real input".
That is the only I can think of.
If that doesn´t work, send me your model, so I can check.
i check"Use complex functions with real input" it was active,but the problem is not removed.i send my model to your email ,if you have spare time, check it.i hope to solve my problem.in fact i want to excite Au-nanoparticles.
Hi, I have just checked your model.
The problem that you have is caused by bad implementation of gold library. I never use libraries implemented in COMSOL.
Whenever you see some value highlighted in red, means something is wrong.
You can find optical constants of gold in Jonson and Christy or Palik. Than you can use it.
If you put for the frequency you are using real values, model will work.
I haven´t checked the rest. Find data and implement it by yourself.
my frequency of my model is 219.1 THZ
but Au-nanoparticles is not excited,what is your idea? Is it possible for me that simulate this model in 3D? my dell pc has a 2GIG ram
Refractive index of gold for the wavelength of 1.393um is 0.43-j*9.51.
It is 215.36THz, that is preety much close.
Your nanoparticles might not be resonant at that frquency. But, you should see some response.
2GB of RAM is ok for 2D, for 3D try and you'll see. I would say that it is insufficient, but depends on application.
thank you very much for your help and give information.if i want to plot magnetic fields in terms of the frequency,is it possible connect to matlab and extract data?or write them from dialog box and then plot tham
you can use function posteval or similar.
How does it work I am not sure. They are rather complex, since the input variables are structures.
Browse COMSOL discussion forum.
If u figure it out, it would be nice to post it here, so others can use that info.
I am working now in 3D simulation to simulate nano-dipole antenna. I read in some papers that I should simulate my model twice, once with all materials as air and the second simulation with all materials defined properly (metals , dielectric, ...). So please do you have an idea on how can I do that? I tried but with no solution!!
Thanks for your useful website,
i try to simulate a spherical gold nanoparticle on glass substrate, i want to use the Fresne equation with TE polarization, in your part of fresnel equations, the excitation is plane wave incident from the n1 medium, thus coming from glass side.
my questions is:
1-how changing the excitation plane wave coming from air side in TE-polarization?
2- Is that possible to simulate only one quarter of the structure? in order to reduce the simulation time and use the magnetic conductor boundary conditions at y= 0 wich allows us to use the symmetry.
thank you vry much.
Srdjan S. Aćimović, postdoc,bio-nano photonics group,Chalmers Insitute of Technology (Gothenburg, Sweeden)google scholarLinkedIn