title: Cladding mode coupling in highly localized fiber Bragg gratings II: complete vectorial analysis.
abstract: Highly localized fiber Bragg gratings can be inscribed point-by-point with focused ultrashort pulses. The transverse localization of the resonant grating causes strong coupling to cladding modes of high azimuthal and radial order. In this paper, we show how the reflected cladding modes can be fully analyzed, taking their vectorial nature, orientation and degeneracies into account. The observed modes' polarization and intensity distributions are directly tied to the dispersive properties and show abrupt transitions in nature, strongly correlated with changes in the coupling strengths.
authors.affiliation: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universit¨at Jena, Max-Wien-Platz 1, 07743 Jena, Germany. thomas@iap.uni-jena.de
authors.forename: Jens U
authors.initials: JU
authors.lastname: Thomas
authors.forename: Nemanja
authors.initials: N
authors.lastname: Jovanovic
authors.forename: Ria G
authors.initials: RG
authors.lastname: Krämer
authors.forename: Graham D
authors.initials: GD
authors.lastname: Marshall
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Withford
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann
authors.forename: Stefan
authors.initials: S
authors.lastname: Nolte
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Steel