title: Magnetic-field sensor based on whispering-gallery modes in a photonic crystal fiber infiltrated with magnetic fluid.
abstract: In this work, a magnetic-field sensor was designed to take advantage of the tunability of the resonance wavelengths of a cylindrical whispering-gallery-mode microresonator. The microresonator is based on a 1.3 cm length of photonic crystal fiber infiltrated with a magnetic fluid containing nanoparticles with diameters of either 5 or 10 nm. The Q-factor achieved for the microresonators was 4.24×10(3) or higher. When a magnetic field is applied, the whispering-gallery-mode resonances shift toward longer wavelengths. The experimentally demonstrated sensitivity of the proposed sensor was as high as 110 pm/mT in the magnetic field range from 0 to 38.7 mT.
authors.forename: Aseel
authors.initials: A
authors.lastname: Mahmood
authors.forename: Vishnu
authors.initials: V
authors.lastname: Kavungal
authors.forename: Sudad S
authors.initials: SS
authors.lastname: Ahmed
authors.forename: Gerald
authors.initials: G
authors.lastname: Farrell
authors.forename: Yuliya
authors.initials: Y
authors.lastname: Semenova