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Proceedings Paper

Ferrofluid-based optical fiber magnetic field sensor fabricated by femtosecond laser irradiation
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Paper Abstract

Optofluid system has been more and more attractive in optical sensing applications such as chemical and biological analysis as it incorporates the unique features from both integrated optics and microfluidics. In recent years, various optofluid based structures have been investigated in/on an optical fiber platform which is referred to as “lab in/on a fiber”. Among those integrated structures, femto-second laser micromaching technique plays an important role due to its high precision fabrication, flexible design, 3D capability, and compatible with other methods. Here we present a ferrofluid based optical fiber magnetic field sensor fabricated by femtosecond (fs) laser irradiation .With the help of fs laser micromaching technique, a micro-reservoir made by capillary tube assembled in a single mode optical fiber could be fabricated. The micro-reservoir functions as a fiber inline Fabry-Perot (FP) cavity which is filled by ferrofluid liquid. The refractive index of the ferrofluid varies as the surrounding magnetic field strength changes, which can be optically probed by the FP interferometer. A fringe visibility of up to 30 dB can be achieved with a detection limit of around 0.4 Gausses. Due to the fabrication, micro-reservoirs can be assembled with optical fiber and distinguished through a microwave-photonic interrogation system. A quasi-distributed magnetic field sensing application has been demonstrated with a high spatial resolution of around 10 cm.

Paper Details

Date Published: 1 March 2016
PDF: 6 pages
Proc. SPIE 9750, Integrated Optics: Devices, Materials, and Technologies XX, 97501U (1 March 2016); doi: 10.1117/12.2213315
Show Author Affiliations
Yang Song, Clemson Univ. (United States)
Lei Yuan, Clemson Univ. (United States)
Liwei Hua, Clemson Univ. (United States)
Qi Zhang, Clemson Univ. (United States)
Jincheng Lei, Clemson Univ. (United States)
Jie Huang, Clemson Univ. (United States)
Hai Xiao, Clemson Univ. (United States)

Published in SPIE Proceedings Vol. 9750:
Integrated Optics: Devices, Materials, and Technologies XX
Jean-Emmanuel Broquin; Gualtiero Nunzi Conti, Editor(s)

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