Sensing properties of symmetrical side-polished photonic crystal fiber based on surface plasmon resonance

A kind of symmetric side-polished photonic crystal fiber is designed for sensing application based on the surface plasmon resonance technology. The finite element method is used to study the influence of structural parameters on the sensing performance. The average wavelength sensitivity (WS) is 2380 nm/RIU for the refractive index ranging from 1.340 to 1.380, and the average WS is 6260 nm/RIU when the refractive index changes from 1.380 to 1.406. The maximum WS at refractive index of 1.406 is 9333 nm/RIU. Furthermore, the polydimethylsiloxane and magnetic fluid are used as the temperature and magnetic field sensitive materials, respectively. Simultaneous measurement of magnetic field and temperature is realized. The magnetic field and temperature sensitivities are 0.60 nm/mT and -4.09 nm/°C, respectively. The designed scheme solves the problem of temperature cross-sensitivity of the magnetic field sensor.