Guilin Sun
Ansys Employee

The phase term in source settings is the initial phase. I guess it is different from the phase what the Stokes parameters. The monitor gives you frequency-domain CW Ex,Ey and Ez (and H components also if you want), so you have the basic quantities and therefore you can calcualte whatever quantities you want, from your definition.

We have an online example for periodic simulation Calculating the far field polarization ellipse – Ansys Optics