Fig. 1. Structure of single-hole dual-core biased-core suspension. (a) Photo of fiber end face; (b) Parabolic-shaped suspension-core fiber optical tweezers; (c) Optical force generated by dual beam focusing

Fig. 2. Optical field distribution of the fiber probe with different hollow hole diameters

Fig. 3. Optical field distribution of the fiber probe for different core powers. (a) C1 is 1 W/m, C2 is 1 W/m; (b) C1 is 0.5 W/m, C2 is 1 W/m; (c) C1 is 1 W/m, C2 is 0.5 W/m

Fig. 4. Comparison of transverse and axial optical trapping forces on particles with different hollow hole diameters. (a)-(b) 5 μm; (c)-(d) 7 μm; (e)-(f) 9 μm

Fig. 5. Comparison of transverse and axial optical trapping forces on particles with different diameters under a 9 μm hollow hole diameter fiber probe. (a)-(b) 2 μm; (c)-(d) 5 μm; (e)-(f) 10 μm

Fig. 6. Comparison of transverse and axial optical trapping forces on particles in the fiber probe model under different core power conditions. (a)-(b) C1 is 1 W/m, C2 is 1 W/m ; (c)-(d) C1 is 0.5 W/m, C2 is 1 W/m; (e)-(f) C1 is 1 W/m, C2 is 0.5 W/m

Fig. 7. Fiber optic tweezers probe preparation process and the photo of a prepared fiber optic tweezers probe

Fig. 8. Schematic diagram of fiber optic tweezers experimental system

Fig. 9. Capture of 10 μm diameter polystyrene particles. (a)-(b) Capture of particles; (c)-(d) Manipulation of moving particles

Fig. 10. Capture of 5 μm diameter polystyrene particles at the probe tip. (a)-(b) Capture of particles; (c)-(d) Manipulation of moving particles

Fig. 11. Non-contact capture of 5 μm diameter polystyrene particles. (a)-(b) Capture of particles; (c)-(d) Manipulation of moving particles

Fig. 12. Ejection of 5 μm diameter polystyrene particles

Fig. 13. Ejection of 2 μm diameter polystyrene particles