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  • Title: Optical Fréedericksz transition in liquid crystals and transfer of the orbital angular momentum of light.
    Author: Piccirillo B, Vella A, Santamato E.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2004 Feb; 69(2 Pt 1):021702. PubMed ID: 14995464.
    Abstract:
    Multistability, out-of-polarization-plane reorientation, and persistent oscillations have been observed in the optical Fréedericks transition in a homeotropically aligned nematic film using a normally incident linearly polarized laser beam with elliptical rather than circular cross section. These features could be ascribed to the presence of an additional optical torque connected with a transfer of the orbital angular momentum of light to the liquid crystal film. A model based on Ritz's variational method confirms this picture.
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