To achieve berry phase I needed to use circularly polarized light, from a post in the forum I've came to know that lumerical can not calculate circularly polarized lights phase directly.
Therefore first I ran the simulation for polarization angle 0 then 90 degree then took the phase difference of S.S21_Gn from angle 0 - angle 90
Is this the right approach? But I am still not getting proper results.
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