Fig. 1. Experimental setup diagram of magnetic field sensing

Fig. 2. Microimage of SMF-PCF sensing region. (a) Cross section of PCF; (b) Before welding of SMF and PCF; (c) after welding of SMF and PCF

Fig. 3. Transmission spectra for different taper lengths

Fig. 4. PCF micrographs of different tapering methods. (a) Intermittent cooling tapering PCF cone area; (b) manual discharge tapering PCF cone area

Fig. 5. Transmission spectra before and after tapering in sensing region

Fig. 6. Transmission spectra before and after magnetic fluid filling

Fig. 7. Transmission spectra for different magnetic field intensities. (a) Total transmission spectra; (b) transmission spectra of dip3

Fig. 8. Variation of wavelength with magnetic field intensity

Fig. 9. Transmission spectra at different temperatures

Fig. 10. Variation of wavelength with temperature