Fig. 1. Cross section of the side-hole fiber SPR sensor and the proposed setup for loss spectrum interrogation. OSA, optical spectrum analyzer.

Fig. 2. Field distribution of the upper part of the fiber core of the (a) y-polarization and (b) x-polarization.

Fig. 3. Re(neff), Re(nSPP), and the loss spectrum of the fiber sensor as a function of wavelength.

Fig. 4. Influence of r3 on the loss spectrum of the side-hole fiber SPR sensor.

Fig. 5. Influence of rd on the loss spectrum of the side-hole fiber SPR sensor.

Fig. 6. Influence of hAu on the loss spectrum of the side-hole fiber SPR sensor.

Fig. 7. (a) The loss spectrum with different external magnetic fields and (b) the fitted result of the resonant wavelength.