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Opt Lett. 2008 Oct 15;33(20):2371-3.

Electromagnetic torque and force in axially symmetric liquid-crystal droplets.

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1
Research Institute for Solid State Physics and Optics, Budapest, Hungary. janossy@szfki.hu

Abstract

Circularly polarized light exerts torque on birefringent objects. In the case of axially symmetric particles, however, the moment of radiation force balances the direct optical torque. This explains the observation that radial liquid-crystal droplets, in contrast to planar droplets, do not spin in circularly polarized light. The conclusion is in agreement with considerations based on the angular momentum conservation of light [Phys. Rev. Lett.96, 163905 (2006)].

PMID:
18923626

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