title: Structural long-period gratings in photonic crystal fibers.
abstract: We report what is believed to be the first example of structural long-period gratings written in pure silica photonic crystal fibers (PCFs). The gratings are realized by periodic collapse of the holes of the PCF by heat treatment with a CO(2) laser. The resulting periodic hole-size perturbation produces core-to-cladding-mode conversion. These results can lead to a new family of structural all-fiber devices that use the unique properties of PCFs.
authors.forename: G
authors.initials: G
authors.lastname: Kakarantzas
authors.forename: T A
authors.initials: TA
authors.lastname: Birks
authors.forename: P St J
authors.initials: PS
authors.lastname: Russell