Efficient generation and sorting of orbital angular momentum eigenmodes of light by thermally tuned q-plates
KARIMI, EBRAHIM and PICCIRILLO, BRUNO and MARRUCCI, LORENZO and SANTAMATO, ENRICO (2009) Efficient generation and sorting of orbital angular momentum eigenmodes of light by thermally tuned q-plates. [Pubblicazione su rivista scientifica]
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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 “q-plate.” The generation efficiency has been optimized by tuning the optical retardation of the q-plate with temperature. The measured OAM m=2 eigenmodes generation efficiency from an input TEM00 beam was of 97%. Mode sorting of the two input OAM m=2 eigenmodes was achieved with an efficiency of 81%.
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