Fig. 1. Schematic diagram of optical microfluidic system^[2]. (a) Demodulation channel (red arrow) and one of the six microlens arrays (blue arrow); (b) embedded optical fiber (red line is the optical path)

Fig. 2. SPR temperature meter^[10]. (a) Hollow fiber filled with liquid crystal medium; (b) structure of the silver coated hollow fiber; (c) cross section of the hollow fiber after filling uniform liquid

Fig. 3. Photos of various micro-structured optical fibers cross section with holes^[19]

Fig. 4. Schematic diagram of the buffer-modulated optofluidic chip with an integrated interferometer and optical trap^[46]

Fig. 5. Diagram of gas sensor pipeline^[60]

Fig. 6. Micro flow detection platform for ARROW^[76]. (a) Fluorescence cross-correlation spectroscopy detection platform; (b) cross-correlation solid core ARROW; (c) cross-correlation liquid core ARROW

Fig. 7. Configuration of the fiber-based fluorescence sensing system (inset: liquid column in fiber)^[2]

Fig. 8. Microflow laser biosensing based on hollow core fiber^[80]

Fig. 9. Chip used for SERS detection^[90]. (a) Schematic of hybridization reaction; (b) schematic of chip structure

Fig. 10. In vivo, chloroplasts are trapped and arranged by non-contact laser (OFP is optical fiber probe)^[109]. (a1) (b1) Multi-particle capture diagram; (a2) (b2) photograph of multiple chloroplasts captured by OFP; (c1) (c2) two rows of chloroplasts arranged by OFP

Fig. 11. Hollow suspended core fiber. (a) Photo of cross section; (b) refractive index profile

Fig. 12. Schemetic of microfluidc chemical reactor based on hollow optical fiber with a suspended core and photo of the corresponding area (inset: microhole and fiber core melt collapse)^[115]

Fig. 13. Dynamic response of the in-fiber analyzing system. (a) Relationship between duration of chemical reactions inside optical fibers and chemiluminescence intensity^[116]; (b) relationship between Vc concentration in optical fibers and chemiluminescence intensity^[115]

Fig. 14. Cross section and refractive index profile^[117]. (a) Cross section of HTCF; (b) 3D refractive index profile; (c) one dimensional refractive index profile along the line passes through the two cores

Fig. 15. Device and experimental schematic diagram^[117]. (a) Optofluidic optical fiber Michelson interferometer; (b) process of the experiment; (c) cross section of the fiber with Au film; (d) microhole on the surface of the fiber

Fig. 16. Correspondence between the interference spectrum and the concentration of Vc solution^[117]

Fig. 17. Schematic diagram of integrated optical fiber flow control ethanol detection device^[118]

Fig. 18. Photo of the optical fiber^[118]. (a) Microscope image of a hollow suspended core fiber without graphene oxide (GO) film; (b) SEM images of the optical fiber containing GO films; (c) SEM of the suspended core coated with GO film; (d) Raman spectroscopy of GO

Fig. 19. Dynamic response of sensor^[118]. (a) Response of different concentrations of ethanol for optofluidic sensor with and without the GO coated on the fiber core; (b) dynamic response of an integrated opto-fluidic fiber sensor device based on GO to the corresponding ethanol concentration