title: Generating far-field orbital angular momenta from near-field optical chirality.
abstract: We demonstrate orbital angular momentum (OAM) transfer by chiral plasmonic nanostructures designed on both sides of a thin suspended metallic membrane. We show how far-field vortex beams with tunable OAM indices can be tailored through nanostructure designs. We reveal the crucial role played by the central aperture that connects the two sides of the membrane from which OAM selection rules are derived in perfect agreement with experimental data.
authors.affiliation: ISIS, Université de Strasbourg, and CNRS (UMR 7006), 8 Allée Gaspard Monge, 67000 Strasbourg, France.
authors.forename: Yuri
authors.initials: Y
authors.lastname: Gorodetski
authors.affiliation: Institut Néel, CNRS, and Université Joseph Fourier (UPR 2940), 25 Rue des Martyrs, 38000 Grenoble, France.
authors.forename: Aurélien
authors.initials: A
authors.lastname: Drezet
authors.affiliation: ISIS, Université de Strasbourg, and CNRS (UMR 7006), 8 Allée Gaspard Monge, 67000 Strasbourg, France.
authors.forename: Cyriaque
authors.initials: C
authors.lastname: Genet
authors.affiliation: ISIS, Université de Strasbourg, and CNRS (UMR 7006), 8 Allée Gaspard Monge, 67000 Strasbourg, France.
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Ebbesen