title: Twisted Schell-model beams with axial symmetry.
abstract: The problem of when a twist can be impressed on a partially coherent beam is solved for Schell-model fields endowed with axial symmetry. A modal analysis can be performed for any such beam, thus permitting evaluation of whether it will withstand the twisting process. Beyond exemplifying some twistable beams, it is shown that, for certain correlation functions, the beam cannot be twisted, no matter how the numerical parameters are chosen.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Borghi
authors.forename: Franco
authors.initials: F
authors.lastname: Gori
authors.forename: Giorgio
authors.initials: G
authors.lastname: Guattari
authors.forename: Massimo
authors.initials: M
authors.lastname: Santarsiero