title: Characterization of dielectric spheres by spiral imaging.
abstract: We study the spiral spectra scattered off transparent dielectric spheres when probed by different Laguerre-Gaussian light beams, carrying nested topological wavefront dislocations. We show that such scattering data may be employed to determine geometrical properties of the spheres, such as their position. The technique is a generalization of standard Mie scattering, and it can be extended to study and to characterize nanospheres.
authors.affiliation: ICFO–Institut de Ciencies Fotoniques and Universitat Politecnica de Catalunya, 08860 Castelldefels (Barcelona), Spain. Dmitri.Petrov@icfo.es
authors.forename: Dmitri
authors.initials: D
authors.lastname: Petrov
authors.forename: Nicolas
authors.initials: N
authors.lastname: Rahuel
authors.forename: Gabriel
authors.initials: G
authors.lastname: Molina-Terriza
authors.forename: Lluis
authors.initials: L
authors.lastname: Torner