title: Zero-group-velocity modes in chalcogenide holey photonic-crystal fibers.
abstract: We demonstrate that a holey photonic-crystal fiber with chalcogenide-glass index contrast can be designed to have a complete gap at a propagation constant beta = 0 that also extends into the non-zero beta region. This type of bandgap (previously identified only at index contrasts unattainable in glasses) opens up a regime for guiding zero-group-velocity modes not possible in holey fibers with the more common finger-like gaps originating from beta-->infinity. Such modes could be used to enhance nonlinear and other material interactions, such as for hollow-core fibers in gas-sensor applications.
authors.affiliation: Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
authors.forename: Ardavan F
authors.initials: AF
authors.lastname: Oskooi
authors.forename: J D
authors.initials: JD
authors.lastname: Joannopoulos
authors.forename: Steven G
authors.initials: SG
authors.lastname: Johnson
mesh_terms: D018011:Chalcogens / Q000737:chemistry*; D017076:Computer-Aided Design; D003460:Crystallization / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D055100:Optical Fibers; D017785:Photons; D016062:Porosity; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D018011:Chalcogens