There is a circular polarized wave moving in the y direction. (You can change the phase to 0.0 to become a linear polarized wave).  Magnitude of both Ex,Ez components can be adjust to have a circular/elliptic polarized wave.
There are 3 polarizer in the simulation. You can change their position and polarization angle with sliders,too. 

VIEW or DOWNLOAD ejs xml source
    Available translation (locale: translators) click link to toggle view of translation done by that user
  1. Deutsch - German(de):fzaeh
then click to translate strings for selected locale.

Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop.