title: Silica Bottle Resonator Sensor for Refractive Index and Temperature Measurements.
abstract: We propose and theoretically demonstrate a bottle resonator sensor with a nanoscale altitude and with alength several of hundreds of microns made on the top of the fiber with a radius of tens microns for refractive index and temperature sensor applications. The whispering gallery modes (WGMs) in the resonators can be excited with a taper fiber placed on the top of the resonator. These sensors can be considered as an alternative to fiber Bragg grating (FBG) sensors.The sensitivity of TM-polarized modes is higher than the sensitivity of the TE-polarized modes, but these values are comparable and both polarizations are suitable for sensor applications. The sensitivity ~150 (nm/RIU) can be reached with abottle resonator on the fiber with the radius 10 μm. It can be improved with theuse of a fiber with a smaller radius. The temperature sensitivity is found to be ~10 pm/K. The temperature sensitivity can decrease ~10% for a fiber with a radius r(co) = 10 μm instead of a fiber with a radius r(co) = 100 μm. These sensors have sensitivities comparable to FBG sensors. A bottle resonator sensor with a nanoscale altitude made on the top of the fiber can be easily integrated in any fiber scheme.
authors.affiliation: Department of Engineering Physics, Polytechnique Montréal, P.O. Box 6079, Station Centre-ville, Montréal, QC H3T 1J4, Canada. galina.nemova@polymtl.ca.
authors.forename: Galina
authors.initials: G
authors.lastname: Nemova
authors.affiliation: Department of Engineering Physics, Polytechnique Montréal, P.O. Box 6079, Station Centre-ville, Montréal, QC H3T 1J4, Canada. raman.kashyap@polymtl.ca.|Department of Electrical Engineering, Polytechnique Montréal, P.O. Box 6079, Station Centre-ville, Montréal, QC H3T 1J4, Canada. raman.kashyap@polymtl.ca.
authors.forename: Raman
authors.initials: R
authors.lastname: Kashyap
keywords: bottle resonator; refractive index sensor; temperature sensor