The mode expansion monitor calculates how much of the propagating field is coupled into specific modes of the waveguide. In this video lesson, you will learn when and how to use the mode expansion monitor.
The following video demonstrates the setup of a mode expansion monitor which can be used to extract the conversion efficiency of a polarization converter taper.
If you want to follow along with this demonstration, please download the associated script file. Open the script file using the FDTD and run the script from the script file editor window. This will set up the objects in the simulation file so they match the starting point of the demonstration.