title: Magnetic field interaction with guided light for detection of an active gaseous medium within an optical fiber.
abstract: We report a novel fiber-optic sensing architecture for the detection of paramagnetic gases. By interacting a modulated magnetic field with guided light within a microstructured optical fiber, it is possible to exploit Faraday Rotation Spectroscopy (FRS) within unprecedentedly small sample volumes. This approach, which utilizes magnetic circular birefringence and magnetic circular dichroism effects, is applied to a photonic bandgap fiber to detect molecular oxygen and operates at a wavelength of 762.309 nm. The optical fiber sensor has a 4.2 nL detection volume and 14.8 cm long sensing region. The observed FRS spectra are compared with a theoretical model that provides a first understanding of guided-mode FRS signals. This FRS guided-wave sensor offers the prospect of new compact sensing schemes.
authors: Institute for Photonics and Advanced Sensing (IPAS) and School of Chemistry and Physics, The University of Adelaide, SA 5005, Australia. florian.englich@adelaide.edu.au
authors: Florian V
authors: FV
authors: Englich
authors: Michal
authors: M
authors: Grabka
authors: David G
authors: DG
authors: Lancaster
authors: Tanya M
authors: TM
authors: Monro
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000032:analysis*; D060526:Magnetic Fields; D055100:Optical Fibers; D010783:Photometry / Q000295:instrumentation*; D013057:Spectrum Analysis / Q000295:instrumentation*
chemical_list: D005740:Gases