Currently, I am doing simulation for DOEs (Diffractive optical elements) by using Binary2 surface and working on it. I also converted my surface phase (binary2 surface) to binary surface *.GDSII format (moreover *.bmp, *.dwg, *.dxf) for fabricating. However, we need to evaluate *.GDSII files ( or *.dwg, *.dxf, *.bmp), I plan to import these files into ZEMAX for their Wavefront evaluation.

1. how can I import these files into ZEMAX (we already defined the fabrication file)

2. Import the above files into ZEMAX for detailed evaluation, I know ZEMAX support for *.sat, *.STL, *.STEP,.... some kinds of CAD standard, but what I am concerned about is the resolution of the CAD file when imported into ZEMAX, is there any problem with this file?

3. They can also be imported by DLL files, however, I have no experience with this kind of User-defined surface, can you please guide me on how to approach it, or a reference if available