title: Reflective Spin-Orbit Geometric Phase from Chiral Anisotropic Optical Media.
abstract: We report on highly reflective spin-orbit geometric phase optical elements based on a helicity-preserving circular Bragg-reflection phenomenon. First, we present a dynamical geometric phase experiment using a flat chiral Bragg mirror. Then, we show that shaping such a geometric phase allows the efficient spin-orbit tailoring of light fields without the need to fulfill any condition on birefringent phase retardation, in contrast to the case of transmission spin-orbit optical elements. This is illustrated by optical vortex generation from chiral liquid crystal droplets in the Bragg regime that unveils spin-orbit consequences of the droplet's curvature. Our results thus introduce a novel class of geometric phase elements-"Bragg-Berry" optical elements.
authors.affiliation: Université Bordeaux, LOMA, UMR 5798, F-33400 Talence, France.|CNRS, LOMA, UMR 5798, F-33400 Talence, France.
authors.forename: Mushegh
authors.initials: M
authors.lastname: Rafayelyan
authors.affiliation: Université Bordeaux, LOMA, UMR 5798, F-33400 Talence, France.|CNRS, LOMA, UMR 5798, F-33400 Talence, France.
authors.forename: Georgiy
authors.initials: G
authors.lastname: Tkachenko
authors.affiliation: Université Bordeaux, LOMA, UMR 5798, F-33400 Talence, France.|CNRS, LOMA, UMR 5798, F-33400 Talence, France.
authors.forename: Etienne
authors.initials: E
authors.lastname: Brasselet