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.

NO2 Sensor Based on Faraday Rotation Spectroscopy Using Ring Array Permanent Magnets

“…The Zeeman splitting transitions involving Δ M J = +1 and Δ M J = −1 interact with RHCP and LHCP lights, respectively. The polarization plane of linearly polarized light is rotated (Faraday effect) due to the difference in the refractive index (i.e., MCB) between LHCP and RHCP lights, where the rotation angle is proportional to the concentration of paramagnetic molecules. , …”