title: Self-focusing and defocusing of twisted light in non-linear media.
abstract: We study the self-focusing and defocusing of a light beam carrying angular momentum (called twisted light) propa- gating in a nonlinear medium. We derive a differential equation for the beam width parameter f as a function of the propagation distance, angular frequency, beam waist and intensity of the beam. The method is based on the Wentzel-Kramers-Brillouin and the paraxial approximations. Analytical expressions for f are obtained, analyzed and illustrated for typical experimental situations.
authors.affiliation: Max Planck Institute of Microstructure Physics, Halle, Germany. athakur@mpi-halle.mpg.de
authors.forename: Anita
authors.initials: A
authors.lastname: Thakur
authors.forename: Jamal
authors.initials: J
authors.lastname: Berakdar
mesh_terms: D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D009391:Nephelometry and Turbidimetry / Q000379:methods*; D017711:Nonlinear Dynamics; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation