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Interpretation of charge distribution in magneto-optical metasurface simulation
Posted Aug 22, 2023, 6:29 a.m. EDT 2 Replies
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Hi everyone, I am studying a magneto-optical metasurface consisting of Co disks deposited on a thin SiO2 layer, a thin Co layer and a massive Au layer. I'm using the Electromagnetic Waves, Frequency Domain module. A circularly polarized wave is incident perpendicularly on the metasurface (I set Ex=1 and Ey=j; is that correct?). When I plot the calculated charge distribution with (nxemw.Px+nyemw.Py+nzemw.Pz), I got a dipolar charge distribution, so I guess I got a snapshot of the charge distribution at a time that I don't know. This distribution is shown in the attached figure. If I had seen a time-averaged charge distribution I would have expected a monopolar distribution. What am I doing wrong?
Thanks for your help
Alberto
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Fields computed in the frequency domain formulation are complex valued. Your plot of the normal component (that's the component of the vector along a surface normal, not to be confused with the "norm" of a vector!) of the polarization P is not a time-averaged value. Rather, it is simply a plot of the real-value part of a complex term. If you want to plot the magnitude of the P vector, plot emw.normP instead. If you want the magnitude of the specific vector component that you described in your post, plot abs( ) of the expression that you wrote.
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Please login with a confirmed email address before reporting spam
Fields computed in the frequency domain formulation are complex valued. Your plot of the normal component (that's the component of the vector along a surface normal, not to be confused with the "norm" of a vector!) of the polarization P is not a time-averaged value. Rather, it is simply a plot of the real-value part of a complex term. If you want to plot the magnitude of the P vector, plot emw.normP instead. If you want the magnitude of the specific vector component that you described in your post, plot abs( ) of the expression that you wrote.
Thank you for your precise and clear answer.
Alberto