Fig. 1. Excessively tilted fiber grating sensor

Fig. 2. Surface modification and bio-functionalization of ExTFG sensor

Fig. 3. GO integrated ExTFG-LSPR immunosensing experimental system

Fig. 4. FESEM images of fiber surface

Fig. 5. Spectra and wavelength shift in surface modification and functionalization of immunosensor

Fig. 6. Experimental results for PD-L1 detection by immunosensor

Fig. 7. Clinical immunosensing result of human serum