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question about three dimension (3D) plasmonic waveguide

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Hi everyone,

Recently I have modeled a 3D plasmonic waveguide for calculating the transmission, utilizing boundary mode analysis and frequency analysis. The power flow distribution is fine (please see attached), but when I do the data process, no value for S parameter analysis.
I am stuck here, when I analyzed 2D waveguide, everything is fine, and the transmission can be simply obtained by using S parameter analysis. I have no idea about 3D model. Anybody faced the same question?
Or I forget the S parameter analysis here, are there any method could obtain the transmission?
If you know, I really appreciate you can do me a favor.

Regards,
Marvin

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