title: Mode-beating-enabled stopband narrowing in all-solid photonic bandgap fiber and sensing applications.
abstract: In this paper, core-cladding modal beating in a short piece of all-solid photonic bandgap fiber (AS-PBF) is observed in longitudinal propagation direction. It is demonstrated that at the stopband range of AS-PBF, the power could transfer back and forth between the fiber core and the first layer of high-index rods. Both experimental results and the theoretical analysis from transverse coupled mode theory confirm that the 3-dB width of the sharp stopband could be significantly narrowed by multicycles of such core-cladding modal couplings, which is of great benefit to the high-resolution sensing applications. Based on such a guiding regime, a high-temperature sensor head is also made and its response to temperature is tested to be of 59.9 pm/°C.
authors.affiliation: College of Physics Science and Technology, Shenzhen Key Laboratory of Sensor Technology, Shenzhen University, Shenzhen, China.
authors.forename: Youfu
authors.initials: Y
authors.lastname: Geng
authors.forename: Xuejin
authors.initials: X
authors.lastname: Li
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Tan
authors.forename: Yuanlong
authors.initials: Y
authors.lastname: Deng
authors.forename: Yongqin
authors.initials: Y
authors.lastname: Yu
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008027:Light; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D014159:Transducers