Discussion Forum

Hi,

I am working on extinction and plasmonic simulation for nanoparticles. I have a working 3D model of the nanoparticle (silver) using references from various Comsol models based on light and nanoparticles interaction. I was hoping to convert the 3D to 2D to perform faster simulations (because I want to run multiple simulations by changing various parameters).

My issue is the units for sigma_ext (extinction), sigma_sc (scattering), and sigma_abs (absoprtion) conversion from m^2 to m. I think this is the issue messing up the graphical response, because my graphs for ext, sc, and abs are showing peaks in the E-06 m (E-12 m^2) range but should have peaks in the E-14 range, and an abscent of a minor second peak for larger nanoparticle sizes. Is there anyway to fix this issue in 2D? Examples of this are in sheet 1 of the attached excel file.

Additionally, the main fix in the 3D model was to add 1.33 to the water material refractive index surrounding the nanoparticle, and to also add 1.33 to the electric field equation ( E0exp(-jemw.k01.33x) ). I've tried applying the same fix to the 2D model, but it caused worse alterations in the wavlengths. As of right now, keeping the refractive index for the 2D model at 1.00 creates the closest results compared to the 3D with 1.33. Examples of this are in sheet 2 of the attache excel file.

I've attached an excel sheet from the derived data sample of the 2D model, and included the 3D and 2D COMSOL models. Any help will be greatly appreciated.

Thanks for the response, Eric