Fig. 1. Diagram of cross section structure of dual-core PCF transverse-stress sensor based on SPR

Fig. 2. Deformation in x direction for different air hole layers of PCF when F=3 N

Fig. 3. Change of deformation under different diameters of big hole. (a) x direction; (b) y direction

Fig. 4. Change of deformation under different diameters of small hole. (a) x direction; (b) y direction

Fig. 5. Change of deformation under different lattice periods of small hole. (a) x direction; (b) y direction

Fig. 6. (a) Loss of fundamental mode under different transverse stresses; (b) relationship between wavelength of resonance peak and transverse stress (d1=8.3 μm, d2=7.06 μm, Λ1=8.68 μm, Λ2=8.15 μm)

Fig. 7. (a) Loss of fundamental mode under different transverse stresses; (b) relationship between wavelength of resonance peak and transverse stress (d1=7.3 μm, d2=6.26 μm, Λ1=8.68 μm, Λ2=8.55 μm)