Multi-curvities femtosecond laser aided microstructures for magnetic field sensing

Joseph Muna Karanja; Yutang Dai; Xian Zhou; Bin Liu

doi:10.1117/12.2196989

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22 August 2015 Multi-curvities femtosecond laser aided microstructures for magnetic field sensing

Joseph Muna Karanja, Yutang Dai, Xian Zhou, Bin Liu

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Proceedings Volume 9656, International Symposium on Photonics and Optoelectronics 2015; 96560J (2015) https://doi.org/10.1117/12.2196989
Event: International Symposium on Photonics and Optics, 2015, Shanghai, China

Abstract

Magnetic sensors utilizing direct magneto-optic field coupling in an optical fiber Bragg grating (FBG) is proposed and demonstrated. The FBG’s cladding is micro-machined into micro-curvities aided by femtosecond laser, and coated with TbDyFe, magnetic sensing element. Number of micro-curvities and laser energy under a laser beam were optimized during FBG micromachining and dramatically improved sensor performance. Six-micro-groove sensor is four times more sensitive as compared to non-micro-grooved standard FBG sample. The effect of 18 mW laser pulse power impacted magnetic sensitivity of magnitude 0.6 pm/mT as compared to 0.14 pm/mT on non-microstructured standard FBG sensor. The depth of the deposited magnetostrictive film was measured as ~5 μm.

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Joseph Muna Karanja, Yutang Dai, Xian Zhou, and Bin Liu "Multi-curvities femtosecond laser aided microstructures for magnetic field sensing", Proc. SPIE 9656, International Symposium on Photonics and Optoelectronics 2015, 96560J (22 August 2015); https://doi.org/10.1117/12.2196989

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