Fig. 1. (a) Simulated results of the output light field distribution. (b) Image of the tapered-shaped GIMMF tip fabricated by using the fiber heating fused and tapered method. (c) Near-field images of the GIMMF output recorded at the pump wavelength of 980 nm and the corresponding beam profiles (normalized intensity). When the length of GIMMF is 20, 50, and 100 cm, the full width at half-maximum intesnsity diameters of the beam are 11.12, 11.78, and 11.53 μm.

Fig. 2. (a) Simulated results of the axial optical trapping force introduced by the GIMMF probes with different solid angles. (b) The simulated results of the transverse optical trapping force introduced by the GIMMF probes with different solid angles (z coordinate of the microparticle is 2.5 μm). The diameter of the trapped microparticle is 5 μm, and the refractive index of the microparticle is 1.4.

Fig. 3. Experimental setup of the optical tweezers based on the GIMMF with a free length. PC, personal computer.

Fig. 4. Video screenshots of a yeast cell (a) trapped and (b) released by the GIMMF probe at different times.

Fig. 5. (a) Image of a yeast cell trapped by the GIMMF optical tweezers; (b) image of the GIMMF probe moving along the transverse direction with a shift of Δx; (c) image of the GIMMF probe to show the definition of the coordinate system; (d) image of the GIMMF probe moving along the axial direction with a shift of Δz.