Geometric Phase Lens in Zemax
Currently, ImagineOptix uses TracePro (Expert Edition) to model the GP Lens for non-sequential ray tracing. There is a GPH_win32_v2.2.dll file designed for TracePro that allows for accurate modeling of the GP Lens and PG and keeps track of the polarization aspects. This is the best way to model these elements.
If this package is not available and Zemax is needed to model the GP Lens, there are some methods to mimic the lens surface. The video will try to give some guidance on how to implement the GP Lens in general.