title: Phase sensitivity of fundamental mode of hollow-core photonic bandgap fiber to internal gas pressure.
abstract: The response of the commercial HC-1550-02 hollow-core photonic bandgap fiber (HC-PBF) to gas pressure applied internally to the hollow-core was experimentally investigated. The transmission spectrum of the HC-PBF was hardly affected by the pressure, while the accumulated phase of the fundamental optical mode showed a normalized pressure sensitivity of 1.044 × 10(-2) rad/(Pa∙m), which is over two orders of magnitude higher than that to the external pressure. Numerical simulation showed that the observed high sensitivity to pressure is due to the pressure-induced refractive index change of air inside the hollow-core. This research could find potential applications in high sensitivity static and dynamic pressure measurement and optical phase manipulation.
authors.forename: Yingchun
authors.initials: Y
authors.lastname: Cao
authors.forename: Wei
authors.initials: W
authors.lastname: Jin
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.forename: Hoi Lut
authors.initials: HL
authors.lastname: Ho