Hi,
I believe S-polarization is relevant only when you expect the metamaterial to cause polarization rotation. For instance, if the input is s-polarized and the output light is s-polarized then only the "S" result should suffice. But if the input is s-polarized but the output is a combination of both s and p then the "S-polarization" result is relevant. For more information, please refer to: Metamaterial S parameter extraction.
It is possible that for some reason this result is not being calculated because of an error.
Go to the Analysis tab of the grating_s_params object, and click on Run Analysis. If there is any error, you should see them appear in red font in the same screen.
Regards,
Amrita
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