Fig. 1. Schematic diagram of experimental system

Fig. 2. Microscopic image and spectrum of microfiber. (a) Diameter and length of microfiber;（b）interference spectrum of microfiber in water

Fig. 3. RI sensitivity calibration of microfiber. (a) Transmission spectra in different RI solutions;（b）RI sensitivity of microfiber

Fig. 4. Biofunctionalization process of microfiber

Fig. 5. FESEM photos of GO-coated microfiber. (a) 3KX; (b) 30KX

Fig. 6. Energy spectrum of microfiber surface modified with GO

Fig. 7. Spectra detection results in surface modification and functionalization of immunosensor. (a) Spectral evolution of microfiber; (b) corresponding wavelength red shift

Fig. 8. RV antibody detection experiment of immunosensor. (a) Change curves of spectrum with RV antigen concentration; (b) variation curve of resonance wavelength shift with time

Fig. 9. Relationship between wavelength red shift of microfiber immunosensor and concentration of RV antibody. (a) Langmuir curve fitting diagram; (b) detection sensitivity of microfiber immunosensor

Fig. 10. Experimental results of clinical immunodetection of microfiber immunosensors. (a) Evolution curve of spectrum; (b) changes of resonance wavelength shift