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  • Title: Tunable liquid crystal q-plates with arbitrary topological charge.
    Author: Slussarenko S, Murauski A, Du T, Chigrinov V, Marrucci L, Santamato E.
    Journal: Opt Express; 2011 Feb 28; 19(5):4085-90. PubMed ID: 21369237.
    Abstract:
    Using a photoalignment technique with a sulphonic azo-dye as the surfactant aligning material, we fabricated electrically tunable liquid crystal q-plates with topological charge 0.5, 1.5 and 3 for generating optical vortex beams with definite orbital angular momentum (OAM) 1,3 and 6 per photon (in units of ¯h), respectively. We carried out several tests on our q-plates, including OAM tomography, finding excellent performances. These devices can have useful applications in general and quantum optics.
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