S parameters and many orders

Dear all,
can anyone explain how to do S-parameter analysis when the period structure supports multiple orders?

The following post discusses how you can modify the S-parameters analysis group to extract S-parameters by only looking at the amplitude and phase of reflected and transmitted light in the 0th grating order:

However, I think it’s not clear whether this approach of only considering the 0th grating order is a method which is standard. It may be worth looking into some publications to see what approaches they use for calculating the S-parameters when multiple grating orders are supported.

Hopefully it helps!

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