Fig. 1. Schematic diagram of surface plasmon resonance

Fig. 2. Simulation results. (a) Schematic diagram of PCF; (b) light field energy distribution of the cladding mode

Fig. 3. Schematic diagram of sensing optical fiber structure

Fig. 4. Structure diagram of photonic crystal fiber. (a) SEM profile of PCF; (b) zoom on PCF

Fig. 5. Structure diagram of microfluidic chip

Fig. 6. Experimental setup

Fig. 7. Experimental results. (a) Normalized transmission spectra of PCF-SPR sensors; (b) relationship between resonant wavelength and refractive index of PCF-SPR structure