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Drude-lorentz dispersion model disparities

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Hi, I'm working on a model for calculating optical cross sections and have run into a weird result. As a beginning test I have based the model on the "Optical Scattering off a Gold Nanosphere" - model found in the application library with slight adjustment so that the diameter is 100 nm.

I have done two different dispersion models of the gold sphere. The first is using refractive index values from the built-in "Rakić et al lorentz-drude model" (application library model uses Brendel-Bormann).

The second was using a seperate electric wave equation for the sphere domain with the lorentz-drude values from the Rakić et al(1998) paper entered in the comsol model (converted to proper units).

The first result is in accordance with Mie-theory while the one using comsol's Drude-Lorentz dispersion model has a unexpected redshift. (see figures)

Can anyone help me shed some light at what might've caused this?



0 Replies Last Post 12 gen 2022, 07:41 GMT-5
COMSOL Moderator

Hello Ørjan Halvorsen

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