Journal
OPTICS EXPRESS
Volume 23, Issue 16, Pages 20668-20674Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.020668
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Funding
- Natural Science Foundation of China [61475028]
- Natural Science Foundation Project of CQ CSTC [cstc2012jjA4007]
- Fundamental Research Funds for the Central Universities [CDJZR13125501, 106112015CDJXY120010]
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An ultra-compact optical fiber magnetic field sensor based on a microstructured optical fiber (MOF) modal interference and ferrofluid (FF) has been proposed and experimentally demonstrated. The magnetic field sensor was fabricated by splicing a tapered germanium-doped index guided MOF with six big holes injected with FF to two conventional single-mode fibers. The transmission spectra of the proposed sensor under different magnetic field intensities have been measured and theoretically analyzed. Due to an efficient interaction between the magnetic nanoparticles in FF and the excited cladding mode, the magnetic field sensitivity reaches up to 117.9pm/mT with a linear range from 0mT to 30mT. Moreover, the fabrication process of the proposed sensor is simple, easy and cost-effective. Therefore, it will be a promising candidate for military, aviation industry, and biomedical applications, especially, for the applications where the space is limited. (C) 2015 Optical Society of America
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