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Manipulating the Orbital Angular Momentum of Light at the Micron Scale with Nematic Disclinations in a Liquid Crystal Film

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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Charles Loussert, Ulysse Delabre, Etienne Brasselet. Manipulating the Orbital Angular Momentum of Light at the Micron Scale with Nematic Disclinations in a Liquid Crystal Film. Physical Review Letters, American Physical Society, 2013, 111 (3), pp.037802. ⟨10.1103/PhysRevLett.111.037802⟩. ⟨hal-00845663⟩

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