Hi,



I am a new Zemax user and I need to simulate the reflection onto a 2-material diffraction grating. See an example of the structure in attached file.



I have read the several topics on the knowledge base and I know that " the diffraction angle depends only on the period of the repetitive structure [...] and not on the shape of the structure within that particular period".

Then I imagine the best way to do my project is to design a 2D diffractive surface (Period over X axis different than period over Y axis).

Is there another way than making an user-defined DLL to do it ?

Can I code this surface on Zemax easily ?



Also, because the grating is 2-material, how to reproduce this fact with a surface or with a custom diffractive object ?

I have already tried to create the grating pattern by combining several user-defined objects but it ends to be messy and not convenient.



In case, I would be pleased if you would have some advices to give about how to treat this kind of gratings on Zemax.



Thank you by advance for your time