title: Robust photonic band gaps for hollow core guidance in PCF made from high index glass.
abstract: We report a new type of photonic bandgap that becomes substantial at remarkably low air-filling fractions (~60%) in triangularlattice photonic crystal fibres (PCF) made from high index glass (n / 2.0). The ratio of inter-hole spacing to wavelength makes these new structures ideal for the experimental realisation of hollow-core PCF in the mid/farinfrared, where suitable glasses (e.g., tellurites and chalcogenides) tend to have high refractive indices.
authors.forename: J
authors.initials: J
authors.lastname: Pottage
authors.forename: David
authors.initials: D
authors.lastname: Bird
authors.forename: T
authors.initials: T
authors.lastname: Hedley
authors.forename: J
authors.initials: J
authors.lastname: Knight
authors.forename: T
authors.initials: T
authors.lastname: Birks
authors.forename: P
authors.initials: P
authors.lastname: Russell
authors.forename: P
authors.initials: P
authors.lastname: Roberts