Fig. 1. Schematic of optical fiber Fabry-Perot MWC structure

Fig. 2. Schematic of femtosecond laser two-photon polymerization 3D printing technology

Fig. 3. Spectra of optical fiber Fabry-Perot MWC changed with refractive index

Fig. 4. Linear fitting results of refractive index sensitivity of optical fiber Fabry-Perot MWC

Fig. 5. Structure of optical fiber Fabry-Perot MWC. (a) Schematic; (b) physical diagram

Fig. 6. Reflection spectrum of optical fiber Fabry-Perot MWC in deionized water

Fig. 7. Fourier transform result of reflection spectrum of optical fiber Fabry-Perot MWC

Fig. 8. Interference spectrum shifts within refractive index range of 1.3346-1.3764

Fig. 9. Linear fitting results of reflection spectra of optical fiber Fabry-Perot MWC prepared by two-photon polymerization technology under different refractive index solutions

Fig. 10. Linear fitting results of reflection spectra of optical fiber Fabry-Perot MWC structure used in repeatability experiments under different refractive index solutions

Fig. 11. Reflection spectra of waveguide-free optical fiber Fabry-Perot microcavity structure in different refractive index solutions,and the illustration shows microcavity structure without micro-waveguide

Fig. 12. Linear fitting results of refractive index sensitivity for Fabry-Perot microcavity structure without micro-waveguide