Kirill
Ansys Employee

Dear Subscriber,

Using the grating analysis group should work well for more complex structures, including multilayer ones, as long as periodicity in the X and Y directions can be assumed.

The note about a "Homogeneous environment" is a general warning. It assumes semi-infinite uniform media before and after the grating, with no other structures outside the grating influencing the light (diffraction orders). For example, the grating structure is assumed to lie between air and a substrate, with no light injected from inside the grating.

When modifying the structure, please follow the suggestions described in the "Updating the model with your parameters" section.

Best regards,
Kirill