Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 27, Issue 22, Pages 2327-2330Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2015.2462749
Keywords
Microfiber sagnac loop interferometer; magnetic field; ferrofluid; dip-wavelength
Funding
- National Natural Science Foundation of China [51377125, 51077107]
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We demonstrate a novel compact optical magnetic field sensor composed of a single-mode microfiber sagnac loop interferometer (SMSLI) and ferrofluid (FF). The refractive index of FF cladding in the twist area of SMSLI is changed with the externally applied magnetic field, which makes the dip-wavelength of the SMSLI transmission spectra shift. The experimental results show that the transmission spectrum of the proposed sensor shifts regularly with the change of externally applied magnetic field intensity. When the magnetic field intensity increased from 0 to 600 Oe, the dip-wavelength of transmission spectrum shifted nearly 200 pm. In addition, a minimal detectable magnetic field strength of the sensor responding to the 50-Hz alternating magnetic field was demonstrated to be similar to 3 Oe experimentally.
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