Use a Polarization () plot to visualize the polarization state for diffraction orders, simulated for periodic structures. A polarization plot displays polarization ellipses for the different diffraction orders in the same diagram. Add a Color Expression subnode as needed. Right-click a 1D Plot Group to add this plot from the More Plots submenu.

From the Plane wave list, choose a predefined expression, if available, or choose Manual or None. If you chose Manual, enter expressions for the polarization plot in the x-expression and y-expression fields. There can also be other predefined options such as Order [0,0], reflection side (efwd) when you have solved a Wavelength Domain study for an Electromagnetic Wave, Frequency Domain interface, for example.

If desired, clear the Show direction of rotation check box, which is selected by default, to not display the direction of rotation as an arrow head on the polarization ellipses.

The default value in the Scale field is 1. Use another value to scale the polarization ellipses.

From the Center position list, choose Auto (the default) to determine the center position of the polarization ellipses automatically. Choose User defined to enter center positions in the x-coordinate and y-coordinate fields.

The Show legends check box is selected by default to display the plotted expressions to the right of the plot. In plots where each line represents a certain time value, eigenvalue, or parameter value, these values are also displayed.

When Automatic is selected from the Legends list (the default), you can add a prefix or a suffix to the automatic legend text in the Prefix and Suffix fields. If Manual is selected from the Legends list, enter your own legend text into the table. If Evaluated is selected, you can use the eval function to create an evaluated legend text in the Legend field that include evaluated global expressions such as global parameters used in sweeps. For the numerical evaluation, you can control the precision in the Precision field (default: 3).