Fig. 1. Structure diagram of sensor

Fig. 2. Simulation results of SPP mode and core mode. (a) SPP mode and (b) y-polarization core mode of sensing region Ⅰ; (c) zero-order, (d) first-order, (e) second-order, (f) third-order, and (g) fourth-order SPP module of sensing region Ⅱ; (h) zero-order y-polarization core mode; (i) first-order x-polarization core mode; (j) first-order y-polarization core mode; (k) second order x-polarization core mode; (l) second order y-polarization core mode

Fig. 3. RI of SPP modes and core modes, and confinement losses of x-polarization and y-polarization

Fig. 4. Plots of resonance peaks changing with RI and temperature

Fig. 5. Plots of resonance wavelength changing with RI. (a) 1.225—1.355; (b) 1.330—1.355

Fig. 6. Variation of resonance wavelength with temperature. (a) 5—85oC; (b) 20—60oC

Fig. 7. Variation of confinement losses when m₁ is in range of 30—60 nm

Fig. 8. Variation of confinement losses when m₂ is in range of 30—60 nm