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

作者：Ebrahim Karimi, Bruno Piccirillo, Eleonora Nagali, Lorenzo Marrucci, Enrico Santamato · 发表于：Applied Physics Letters · 年份：2009 · DOI：10.1063/1.3154549 · 被引用次数：258 · 研究领域：Orbital Angular Momentum in Optics、Metamaterials and Metasurfaces Applications、Liquid Crystal Research Advancements

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%.