How can I get the Polarization of the Electric field in CST?

I want to get the polarization of the electric field after the light across some structured mental with CST　ＭＷＳ．
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Create a Plane wave source. Use the option Electric Field Vector option to define the polarization

by creating the plane wave excitation, you should select the polarization as linear or circular.

thanks~I get it.
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thank you ,I will try it!