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Surface charge density plot in RF module

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Hi Now I'm studying plasmonic nanoparticle.

I can get scattering, absorption and electromagnetic field enhancement.

But I wanna get surface charge density from simulation result.

someone said write rho=epsilon0_const(nxemw.Ex+nyemw.Ey+nzemw.Ez) into comsol but actually I'm a beginner at COMSOL. So I cannot get how to do. If that expression is right where should i put that expression? I already put that in variables section but error message is occured they said nx is undefined value. Please explain A to Z for surface charge density plot.

I'll attach some example and my comsol page that I want. additionally my nanoparticle is gold nanocube

Please help me.



1 Reply Last Post 21.12.2022, 16:41 GMT-5
Robert Koslover Certified Consultant

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Posted: 2 years ago 21.12.2022, 16:41 GMT-5

nx, ny, and nz are defined on surfaces. Do a surface plot. And plot the quantity epsilon0_const*(nx*emw.Ex+ny*emw.Ey+nz*emw.Ez) .

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
nx, ny, and nz are defined on *surfaces*. Do a *surface plot*. And plot the quantity epsilon0_const\*(nx\*emw.Ex+ny\*emw.Ey+nz\*emw.Ez) .

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