25 April 2012 A grating-less in-fibre magnetometer realised in a polymer-MOF infiltrated using ferrofluid
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We report a grating-less, in-fibre magnetometer realised in a polymethylmethacrylate (PMMA) microstructured optical fibre that has been infiltrated using a hydrocarbon oil based ferrofluid. The lossy magnetic fluid has been infiltrated by capillarity action into the microcapillaries of the fiber cladding, resulting in a generation of a short cut-off band located in the vicinity of 600nm. When the magnetic field is applied perpendicular to the fiber axis, the ferrofluid undergoes refractive index and scattering loss changes, modulating the transmission properties of the infiltrated microstructured fibre. Spectral measurements of the transmitted signal are reported for magnetic field changes up to 1300Gauss, 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 fibre axis, the sensor exhibits high polarisation sensitivity for a specific wavelength band, providing the possibility of directional measurements.
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A. Candiani, A. Candiani, A. Argyros, A. Argyros, R. Lwin, R. Lwin, S. G. Leon-Saval, S. G. Leon-Saval, G. Zito, G. Zito, S. Selleri, S. Selleri, S. Pissadakis, S. Pissadakis, } "A grating-less in-fibre magnetometer realised in a polymer-MOF infiltrated using ferrofluid", Proc. SPIE 8426, Microstructured and Specialty Optical Fibres, 84260E (25 April 2012); doi: 10.1117/12.922700; https://doi.org/10.1117/12.922700

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