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- W3125302356 abstract "Abstract A novel magnetic field sensor is proposed based on the combination of in-line tapered photonic crystal fibre (PCF) Mach–Zehnder interferometer and magnetic nanoparticles. The sensor is theoretically investigated and experimentally realized. The effect of the mechanical strain and the magnetic field on the sensitivity of the sensor is studied. It is found that the proposed sensor shows a wavelength-sensitivity of $$-,0.072,text {nm/mT}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mo>-</mml:mo> <mml:mspace /> <mml:mn>0.072</mml:mn> <mml:mspace /> <mml:mtext>nm/mT</mml:mtext> </mml:mrow> </mml:math> and a strain-sensitivity of $$1,text {pm/}upmu ,epsilon ,$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>1</mml:mn> <mml:mspace /> <mml:mtext>pm/</mml:mtext> <mml:mi>μ</mml:mi> <mml:mspace /> <mml:mi>ϵ</mml:mi> <mml:mspace /> </mml:mrow> </mml:math> . To evaluate the effect of the magnetic nanoparticles on the output light intensity, the sensitivity response of the device has been measured under different magnetic field strengths for different length scales. The experimental results show refractive index changes of the magnetic nanoparticles-infiltrated PCF—acting as fibre cladding—under the applied magnetic field leads to variations of the interferometric output. The sensitivity of magnetic field measurement with the sensor with $$30,text {mm}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>30</mml:mn> <mml:mspace /> <mml:mtext>mm</mml:mtext> </mml:mrow> </mml:math> and $$40,text {mm}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>40</mml:mn> <mml:mspace /> <mml:mtext>mm</mml:mtext> </mml:mrow> </mml:math> PCF could reach up to $$0.021,text {dB/mT}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>0.021</mml:mn> <mml:mspace /> <mml:mtext>dB/mT</mml:mtext> </mml:mrow> </mml:math> and $$0.017,text {dB/mT}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>0.017</mml:mn> <mml:mspace /> <mml:mtext>dB/mT</mml:mtext> </mml:mrow> </mml:math> , respectively. The results show a very good linear response that is an essential requirement for the practical sensors. The proposed magnetic field sensor finds applications in various areas, such as optical sensing, military, power industry, and tunable photonic devices." @default.
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- W3125302356 date "2021-07-12" @default.
- W3125302356 modified "2023-10-16" @default.
- W3125302356 title "Designing magnetic field sensor based on tapered photonic crystal fibre assisted by a ferrofluid" @default.
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- W3125302356 doi "https://doi.org/10.1038/s41598-021-93568-z" @default.
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