title: Micro-step localization using double charge optical vortex interferometer.
abstract: We investigate the diffraction effects of focused Gaussian beams yielding a double optical vortex by a nano-step structure fabricated in a transparent media. When approaching such a step the double vortex splits into single ones which move in a characteristic way. By observing this movement we can determine the position of the step with high resolution. Our theoretical predictions were verified experimentally.
authors.affiliation: Institute of Physics, Wrocław University of Techology, Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland. Jan.Masajada@pwr.wroc.pl
authors.forename: Jan
authors.initials: J
authors.lastname: Masajada
authors.forename: Monika
authors.initials: M
authors.lastname: Leniec
authors.forename: Sławomir
authors.initials: S
authors.lastname: Drobczyński
authors.forename: Hugo
authors.initials: H
authors.lastname: Thienpont
authors.forename: Bernard
authors.initials: B
authors.lastname: Kress