at the moment, I would like to design a polarization rotator in Interconnect based on wave plates. In real life waveguide polarization rotators have an elliptical eigenvector. The simplest way to include this information in spherical coordinates would be to give Chi a certain value of the building block.
I think Psi is related to the circularity and the retardation is related to the orientation of the wave plate. But is there a way to give Chi a non-zero value? Maybe you can recommend a more suitable element to create such realistic polarization rotators.
Thank you for your answer!