Menu

Discussion Forum

New Discussion
Filtern

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.

Help Modeling Au Nanoparticle Plasmonic Resonance

Posted 19.02.2015, 11:54 GMT-5 RF & Microwave Engineering, Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization Version 5.0 0 Replies

Ryan Freeman
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi, I'm a new Comsol user and am trying to simulate the transmission spectra of a gold nanoparticle, and I'm getting some confusing results. I based the model of of the "plasmonic wire grating" example model, and while the electric field distribution results make sense, and show well localized plasmonic modes at different corners of the particle, the transmission spectra doesn't show any obvious plasmonic resonances.

Maybe I'm confused with how to define the transmission coefficient. Currently I'm defining the transmission coefficient as abs(emw.S21)^2 where port 1 is where the plane wave is excited and port 2 is where it is terminated. In the attached screenshot I've shown where the scattering matrix element for port 2 is defined in the port settings->equation tab. This expression makes it seem like only the light that is in the same direction as the incident light is counted towards the transmission spectrum, which seems strange to me as light could be scattered in any direction.

Could someone A) explain how to interpret the scattering matrix element in the attached screenshot and B) give any insight into how to properly set up the physics (ports, boundary conditions, meshing) so that a proper transmission spectrum can be attained?

Thanks for any help!
0 Replies Last Post 19.02.2015, 11:54 GMT-5
COMSOL Moderator

Hello Ryan Freeman

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

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.

Suggested Content