title: Gradient-index axicon lenses: a quasi-geometrical study.
abstract: Unconventional imaging and focusing properties are obtained when odd powers of the radial coordinate are present in a radial gradient-index profile. We calculate the transmittance function for this kind of medium under a paraxial approximation by a quasi-geometrical approach. Likewise, we analyze the pupil effect; that is, we evaluate the intensity distribution diffracted by a gradient-index axicon at the image plane.
authors.forename: R M
authors.initials: RM
authors.lastname: González
authors.forename: J
authors.initials: J
authors.lastname: Liñares
authors.forename: C
authors.initials: C
authors.lastname: Gómez-Reino