title: Three-dimensional field distribution in the focal region of low-Fresnel-number axicons.
abstract: Three-dimensional intensity and phase distributions generated by microaxicons are evaluated in the low-Fresnel-number regime. Apertured and nonapertured conical wavefronts may generate transverse patterns with notable deviations from the expected nondiffracting Bessel beam. First-order analytical expressions are proposed for the evaluation of the wave field produced by axicons of different Fresnel number in the focal region.
authors.affiliation: Department of Optics, University of Valencia, Burjassot, Spain. carlos.zapata@uv.es
authors.forename: Carlos J
authors.initials: CJ
authors.lastname: Zapata-Rodríguez
authors.forename: Agustín
authors.initials: A
authors.lastname: Sánchez-Losa