Abstract

Spin–orbit interaction resulting from spatial polarization state manipulation is demonstrated. Polarization-state manipulation is achieved by utilizing the effective birefringent nature of subwavelength structures acting as an anisotropic inhomogeneous medium. Experimental verification is obtained by measuring the effect of the unavoidable spin-dependent Pancharatnam–Berry phase modulation on the far-field diffraction pattern of the beam. Unlike the usual dynamic spin–orbit interaction that splits spin states in the temporal frequency (energy) domain, this topological spin–orbit interaction results in the splitting of spin states degenerated by their spatial frequencies (momentum).

© 2008 Optical Society of America

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