title: Optical vortices at Fano resonances.
abstract: We study the transmission properties of a one-dimensional array with intersite side-coupled defect and demonstrate that, as the system undergoes sharp Fano resonance, it exhibits geometry-induced vorticity of the energy flux. The optical vortex inverts its handedness at the Fano resonance, revealing a strong link between two phenomena, both being of interference origin. Our approach is quite general and can be applied to a variety of systems; as an example we demonstrate a similar effect in photonic crystal structure.
authors.affiliation: Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200, Australia.
authors.forename: Yi
authors.initials: Y
authors.lastname: Xu
authors.forename: Andrey E
authors.initials: AE
authors.lastname: Miroshnichenko
authors.forename: Anton S
authors.initials: AS
authors.lastname: Desyatnikov