title: Far-field measurements of vortex beams interacting with nanoholes.
abstract: We measure the far-field intensity of vortex beams going through nanoholes. The process is analyzed in terms of helicity and total angular momentum. It is seen that the total angular momentum is preserved in the process, and helicity is not. We compute the ratio between the two transmitted helicity components, γm,p. We observe that this ratio is highly dependent on the helicity (p) and the angular momentum (m) of the incident vortex beam in consideration. Due to the mirror symmetry of the nanoholes, we are able to relate the transmission properties of vortex beams with a certain helicity and angular momentum, with the ones with opposite helicity and angular momentum. Interestingly, vortex beams enhance the γm,p ratio as compared to those obtained by Gaussian beams.
authors.affiliation: Department of Physics and Astronomy, Macquarie University, 2109 NSW, Australia.|ARC Centre for Engineered Quantum Systems, Macquarie University, 2109 NSW, Australia.|Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, France.
authors.forename: Xavier
authors.initials: X
authors.lastname: Zambrana-Puyalto
authors.affiliation: Department of Physics and Astronomy, Macquarie University, 2109 NSW, Australia.
authors.forename: Xavier
authors.initials: X
authors.lastname: Vidal
authors.affiliation: Institut of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors.forename: Ivan
authors.initials: I
authors.lastname: Fernandez-Corbaton
authors.affiliation: Department of Physics and Astronomy, Macquarie University, 2109 NSW, Australia.|ARC Centre for Engineered Quantum Systems, Macquarie University, 2109 NSW, Australia.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Molina-Terriza