Efficient generation and sorting of orbital angular momentum eigenmodes of light by thermally tuned q-plates

Abstract

We present methods for generating and for sorting specific orbital angular momentum (OAM) eigenmodes of a light beam with high efficiency, using a liquid crystal birefringent plate with unit topological charge, known as \qo{q-plate}. The generation efficiency has been optimized by tuning the optical retardation of the q-plate with temperature. The measured OAM $m=\pm 2$ eigenmodes generation efficiency from an input TEM${}_{00}$ beam was of 97%. Mode sorting of the two input OAM $m=\pm 2$ eigenmodes was achieved with an efficiency of 81% and an extinction-ratio (or cross-talk) larger than 4.5:1.

4 pages, 3 Figures and 1 table. Submitted

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• Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
• Hypergeometric-Gaussian Modes
• Pancharatnam-Berry phase optical elements for wavefront shaping in the visible domain: switchable helical modes generation

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