The analytic solution does not state that it is for a down-going wave. Unless specified, the solution has both up-going and down-going waves. This could be confusing.
The setup image (generated by plotObj3D) has a downward propagating wave with Ex and Hy positive. When I saw this, I thought everything was left-handed at first. Do we want to put the Hy arrow in the opposite direction?
PlanewaveWidget:
When looking at real and imaginary components of Ex and Hy in EM data at Rx hole, values never crossed the 0 axis. I think that both Re and Im are only plotting the amplitude right now.
Also, I don’t think the phase data are being plotted, just the amplitude.
Since this is visualized in "interactive plane profile", were you planning on removing this plot?
Interactive Plane Profile
Could the zero crossing be the same for both Re and Im, and also be labelled? I see no problem with having different scales for the Re and Im components though.
Polarization Ellipse
The polarization ellipse could be discussed when we talk about phase. The angle of the major axis tells us the phase relationship between Ex and Hy.