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#### Geometric spin Hall effect of light in tightly focused polarization-tailored light beams

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Neugebauer, M., Banzer, P., Bauer, T., Orlov, S., Lindlein, N., Aiello, A., et al. (2014).
Geometric spin Hall effect of light in tightly focused polarization-tailored light beams.* PHYSICAL
REVIEW A,* *89*(1): 013840. doi:10.1103/PhysRevA.89.013840.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-665D-5

##### Abstract

Recently, it was shown that a nonzero transverse angular momentum manifests itself in a polarization-dependent intensity shift of the barycenter of a paraxial light beam [Aiello et al., Phys. Rev. Lett. 103, 100401 (2009)]. The underlying effect is phenomenologically similar to the spin Hall effect of light but does not depend on the specific light-matter interaction and can be interpreted as a purely geometric effect. Thus, it was named the geometric spin Hall effect of light. Here, we experimentally investigate the appearance of this effect in tightly focused vector beams. We use an experimental nanoprobing technique in combination with a reconstruction algorithm to verify the relative shifts of the components of the electric energy density and the shift of the intensity in the focal plane. By that, we experimentally demonstrate the geometric spin Hall effect of light in a highly nonparaxial beam.