Efficient generation and sorting of orbital angular momentum eigenmodes of light by thermally tuned q-plates
Ebrahim Karimi, Bruno Piccirillo, Eleonora Nagali, Lorenzo Marrucci,, and Enrico Santamato
TL;DR
This paper introduces thermally tuned q-plates for highly efficient generation and sorting of specific orbital angular momentum modes of light, achieving near-perfect efficiency and low cross-talk.
Contribution
It demonstrates a method to optimize OAM mode generation and sorting efficiency using temperature-tuned liquid crystal q-plates.
Findings
Generation efficiency of 97% for OAM modes m=±2.
Mode sorting efficiency of 81%.
Extinction ratio greater than 4.5:1.
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 eigenmodes generation efficiency from an input TEM beam was of 97%. Mode sorting of the two input OAM eigenmodes was achieved with an efficiency of 81% and an extinction-ratio (or cross-talk) larger than 4.5:1.
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