Fig. 1. Scheme of MMI

Fig. 2. Interference spectrum of MMI near the dispersion turning point

Fig. 3. Comparison between different microfiber refractive index sensors in terms of sensitivities

Fig. 4. Different microfiber interferometric biosensors based on bio-binding enhancement. （a） Microfiber interferometric optofluidic biosensor^［33］； （b） MMI-ELISA biosensor^［36］； （c） polydopamine-based molecular imprinted microfiber biosensor^［37］

Fig. 5. Wrinkle interface and microsphere array interface for increasing the assembly area of identifying molecules

Fig. 6. Methods of plasma resonance interface enhanced evanescent field