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Spin orbit interaction and the resulting Spin Hall effect of light are underrecent intensive investigations because of their fundamental nature andpotential applications. Here, we report an extraordinary spin specific beamshift of light and demonstrate its tunability in an inhomogeneous anisotropicmedium exhibiting spatially varying retardance level. The spin specificity(shift occurs only for one circular polarization mode, keeping the otherorthogonal mode unaffected) is shown to arise due to the combined spatialgradients of the geometric phase and the dynamical phase of light. Theconstituent two orthogonal circular polarization modes of an input linearlypolarized light evolve in different trajectories, eventually manifesting as alarge and tunable spin separation. The spin specificity of the beam shift andthe demonstrated principle of simultaneously tailoring space-varying geometricand dynamical phase of light for achieving its tunability (of both magnitudeand direction), may provide an attractive route towards development ofspin-optical devices.

Extraordinary Spin specific beam shift of Light in an Inhomogeneous Anisotropic medium