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The semiclassical evolution of spinning particles has recently beenre-examined in condensed matter physics, high energy physics, and optics,resulting in the prediction of the intrinsic spin Hall effect associated withthe Berry phase. A fundamental nature of this effect is related to thespin-orbit interaction and topological monopoles. Here we report a unifiedtheory and a direct observation of two mutual phenomena: a spin-dependentdeflection (the spin Hall effect) of photons and the precession of the Stokesvector along the coiled ray trajectory of classical geometrical optics. Ourmeasurements are in perfect agreement with theoretical predictions, therebyverifying the dynamical action of the topological Berry-phase monopole in theevolution of light. These results may have promising applications innano-optics and can be immediately extrapolated to the evolution of masslessparticles in a variety of physical systems.

Geometrodynamics of Spinning Light