14 December 2019 14 9K Report

Hi,

I am trying to get scattering cross-section from gold hemispherical nanoparticle (r = 20 nm) placed on the Silicon substrate. I am attaching my image of the geometry. Substrate is being modeled by a cylindrical domain inside air domain. The issue is I am not getting plasmonic resonance and just getting noise. I am aware of the "scattering from the substrate" model on COMSOL. However, I wanted to solve for scattering field instead of total field. And I think instead of representing entire lower half by the substrate, it could be represented by a slab too? What are your suggestions?

Regards,

Hamza

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