Fig. 1. Experimental setup for FSI-CRD sensing

Fig. 2. Schematic of fiber taper

Fig. 3. Microscopic images of fiber taper. (a) Front section; (b)-(e) middle section; (f) tail section

Fig. 4. Initial decay curve with the taper immersed in deionized water

Fig. 5. Transient cavity loss with the taper immersed in deionized water followed by the additions of glucose solutions

Fig. 6. Fitting curves of the ring-down spectrum peak points under different concentration. (a) Glucose; (b) NaCl

Fig. 7. Relationship between the cavity loss and concentration. (a) Glucose; (b) NaCl