title: Optical spin-to-orbital plasmonic angular momentum conversion in subwavelength apertures.
abstract: Within the framework of the Huygens-Fresnel approach, we evaluate the coherent superposition of surface plasmon (SP) modes excited by an incident circularly polarized light propagating through an array of subwavelength holes. Numerical results of the plasmonic distribution exhibit a rich structure that reveals the creation and annihilation of vortex arrays in the field phase. These phase singularities stem from total transfer of the spin angular momentum (AM) of the incident radiation to the orbital AM of the SP.
authors.affiliation: Instituto de Física, Universidade Estadual de Campinas, Campinas-SP, Brazil. paulocab@ifi.unicamp.br
authors.forename: P A
authors.initials: PA
authors.lastname: Brandão
authors.forename: S B
authors.initials: SB
authors.lastname: Cavalcanti