Title :
A Sandwich Structure for the Magnetic Field Detection With Supermodes Interference
Author :
Ran Gao ; Yi Jiang ; Gang Li
Author_Institution :
Sch. of Opto-Electron., Beijing Inst. of Technol., Beijing, China
Abstract :
A sandwich structure between two fiber cores and the magnetic fluid has been designed and tested for the magnetic field detection. The magnetic fluid is clamped between two parallel cores in the photonic crystal fiber. The broadband light is propagated longitudinally with periodical coupling between two parallel cores. Even and odd supermodes with different propagation constants are formed, which result in the supermodes interference. The group effective refractive indices of supermodes depend on that of the magnetic fluid under different magnetic field, and the magnetic field is measured by interrogating the wavelength shift of the transmission spectrum. The experimental results show that the sensitivity of up to 143 pm/Oe is achieved.
Keywords :
holey fibres; magnetic field measurement; magnetic fluids; photonic crystals; refractive index; sandwich structures; broadband light; fiber cores; group effective refractive indices; magnetic field detection; magnetic fluid; parallel cores; photonic crystal fiber; sandwich structure; supermodes interference; transmission spectrum; wavelength shift; Magnetic cores; Magnetic field measurement; Magnetic fields; Magnetic liquids; Optical fiber sensors; Optical fibers; Sandwich structures; All-optical devices; Fiber optics components; Magneto-optical materials; all-optical devices; fiber optics components;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2371034
