title: Femtosecond laser fabrication of tubular waveguides in poly(methyl methacrylate).
abstract: Femtosecond laser direct writing is employed for the fabrication of buried tubular waveguides in bulk poly(methyl methacrylate). A novel technique using selective chemical etching is presented to resolve the two-dimensional refractive-index profile of the fabrication structures. End-to-end coupling in the waveguides reveals a near-field intensity distribution that results from the superimposition of several propagating modes with different azimuthal symmetries. Mode analysis of the tubular waveguides is performed using the finite-difference method, and the possible propagating mode profiles are compared with the experimental data.
authors.affiliation: School of Optics and Center for Research and Education in Optics and Lasers, University of Central Florida, Orlando, Florida 32816, USA. azoubir@mail.ucf.edu
authors.forename: Arnaud
authors.initials: A
authors.lastname: Zoubir
authors.forename: Cedric
authors.initials: C
authors.lastname: Lopez
authors.forename: Martin
authors.initials: M
authors.lastname: Richardson
authors.forename: Kathleen
authors.initials: K
authors.lastname: Richardson