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Proceedings Paper

Magnetic field detection using magnetorheological optical resonators
Author(s): Edoardo Rubino; Tindaro Ioppolo
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Paper Abstract

In this paper, we investigate the feasibility of a magnetic field sensor that is based on a magnetorheological micro-optical resonator. The optical resonator has a spherical shape and a diameter of a few hundred micrometers. The resonator is fabricated by using a polymeric matrix made of polyvinyl chloride (PVC) plastisol with embedded magnetically polarizable micro-particles. When the optical resonator is subjected to an external magnetic field, the morphology (radius and refractive index) of the resonator is perturbed by the magnetic forces acting on it, leading to a shift of the optical resonances also known as whispering gallery modes (WGM). In this study, the effect of a static and harmonic magnetic field, as well as the concentration of the magnetic micro-particles on the optical mode shift is investigated. The optical resonances obtained with the PVC plastisol resonator showed a quality factor of ∼106 . The dynamical behavior of the optical resonator is investigated in the range between 0 and 200 Hz. The sensitivity of the optical resonator reaches a maximum value for a ratio between micro-particles and the polymeric matrix of 2:1 in weight. Experimental results indicate a sensitivity of 0.297 pm/mT leading to a resolution of 336 μT.

Paper Details

Date Published: 22 February 2018
PDF: 8 pages
Proc. SPIE 10539, Photonic Instrumentation Engineering V, 105390W (22 February 2018); doi: 10.1117/12.2290212
Show Author Affiliations
Edoardo Rubino, Univ. of Wisconsin-Platteville (United States)
Tindaro Ioppolo, Southern Methodist Univ. (United States)

Published in SPIE Proceedings Vol. 10539:
Photonic Instrumentation Engineering V
Yakov G. Soskind, Editor(s)

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