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Polarization-controlled evolution of light transverse modes and associated Pancharatnam geometric phase in orbital angular momentum

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arxiv 0909.2768 v2 pith:5H6LJ3MJ submitted 2009-09-15 physics.optics

classification physics.optics
keywords angularmomentumbeamorbitalassociatedgeometriclightmethod
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abstract

We present an easy, efficient and fast method to generate arbitrary linear combinations of light orbital angular momentum eigenstates $\ell=\pm 2$ starting from a linearly polarized TEM$_{00}$ laser beam. The method exploits the spin-to-orbital angular momentum conversion capability of a liquid-crystal-based $q$-plate and a Dove prism inserted in a Sagnac polarizing interferometer. The nominal generation efficiency is 100\%, being limited only by reflection and scattering losses in the optical components. When closed paths are followed on the polarization Poincar\'{e} sphere of the input beam, the associated Pancharatnam geometric phase is transferred unchanged to the orbital angular momentum state of the output beam.

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