Tunable liquid crystal q-plates with arbitrary topological charge
Slussarenko, Sergei and Marrucci, Lorenzo and Santamato, Enrico (2011) Tunable liquid crystal q-plates with arbitrary topological charge. [Pubblicazione su rivista scientifica]
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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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