We demonstrate topological features in a spin-orbit coupled inhomogeneously polarized beam of light due to propagation of a linearly polarized focused Gaussian beam through a tilted-rotated (θ-ϕ) quartz crystal plate. The crystal plate is kept in a polarization interferometer, and transverse and longitudinal phase difference is introduced between the o- and e-wave-beams via (θ-ϕ) variation. The curvature in the phase difference, originating at a phase saddle, at the stem of an intensity forklet pattern, enables continuous rotation of the output two-lobe intensity pattern as a function of (θ-ϕ). The transverse spin-shift of the rotating output beam shows variation in both magnitude and slope. Such a study of exploring topological features arising due to spin-orbit coupling in simple optical systems is of fundamental interest and is expected to open up potential applications in the investigation of material anisotropy and polarization-sensitive sensing.
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