Abstract
We present an in-fibre magnetic field sensor realized in a polymeric microstructured optical fiber that has been infiltrated using ferrofluid. The infiltrated lossy magnetic fluid into the microcapillaries of the fiber cladding generates a short cut-off close to 600 nm. By applying a magnetic field perpendicular to the fiber axis, the ferrofluid undergoes refractive index and scattering loss changes, modulating the transmission properties of the infiltrated microstructured fibre and consequently shifting the cut-off band to longer wavelength. Spectral measurements of the transmitted signal are reported for magnetic field changes up to 1,300 Gauss, revealing a strong decrease of the signal near its bandgap edge proportionally with the increase of the magnetic field. Instead, when the magnetic field is applied with respect to the rotational symmetry the fiber axis, the sensor exhibits high polarisation sensitivity for a specific wavelength band, providing the possibility of directional measurements.
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Candiani, A. et al. (2014). An In-Fiber Magnetometer Implemented in a Polymeric-MOF Utilizing Ferrofluid. In: Baldini, F., et al. Sensors. Lecture Notes in Electrical Engineering, vol 162. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3860-1_40
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DOI: https://doi.org/10.1007/978-1-4614-3860-1_40
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