First, you have the script to calculate the transmission/reflection of RCP and LCP.
Second, from your screenshot, I can see that the substrate is not extended to the outside of the boundaries: bottom should be outside of PML, and sides should be outside of periodic boundaries.
Make sure the incdent polarization is what the reference used. There are some confusions in the literature and textbooks regarding to the handedness of a circular polarization. Please refer to my short paper at Photonics West 2024: http://dx.doi.org/10.1117/12.2691788
You may also refer to this post to check more:Â
Ansys Insight: Why my simulation result is different from published paper or experiment?
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