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Phys Rev Lett. 2013 Jul 19;111(3):037802. Epub 2013 Jul 16.

Manipulating the orbital angular momentum of light at the micron scale with nematic disclinations in a liquid crystal film.

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1
Laboratoire Ondes et Matière d'Aquitaine, Université de Bordeaux, CNRS, UMR 5798, F-33400 Talence, France.

Abstract

We report on the experimental manipulation of the orbital angular momentum of light by exploiting a kind of topological defects that spontaneously appear in nematics-disclinations-as microscopic optical spin-orbit interfaces whose operating wavelength can be controlled electrically. Using six different kinds of disclinations, we demonstrate the efficient generation of both scalar and vectorial singular light beams with a broad topological diversity from a fundamental Gaussian beam.

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