We proposed and experimentally validated an all-fiber probe based on the fusion splicing of multiple fibers, designed to capture the cells or microparticles. Introducing the 980 nm laser into the optical fiber and shaping the beam with the probe, which was fabricated by coaxially splicing the no-core fiber (NCF) with the graded-index (GRIN) fiber onto the single-mode fiber (SMF), created a light trap. (We took the first letters of three types of fibers and named it SNG probe.) The focusing effect of the Gaussian beam was tuned by matching the lengths of the NCF and GRIN to achieve optical trapping of particles. We simulated the optical field of the SNG all-fiber optical tweezers (AFOTs) and the dynamic force distribution of microparticles at different positions within the optical field. We also developed a numerical analytical model of the OTs to analyze the effect of fiber length on the capture performance. The output optical field distribution of the SNG AFOTs was experimentally tested, confirming the capability of this fiber tweezer for non-contact and long-distance capture of yeast cells (more than 240 μm). This type of OTs has the potential to advance relevant research in biology and chemistry.
In order to improve the working performance of the optical fiber spectrum analyzer, a spectrum analyzer with an ultrasmall gradient-index (GRIN) fiber probe was studied. The theoretical model of this spectrum analyzer was established and a near-infrared spectrum analyzer with an ultra-small GRIN fiber probe was constructed. The performance of the analyzer was demonstrated using a narrow bandpass filter. The experimental results show that the spectrum analyzer with the GRIN fiber probe can obtain higher output power than that with the single-mode fiber probe at the same distance. In addition, the spectrum analyzer with the GRIN fiber probe still has good performance within the range twice the working distance of the GRIN fiber probe, which is near 1 mm. However, the system with the single-mode probe can only work within the range of 0.4 mm. The results demonstrate that the spectrum analyzer with the GRIN fiber probe has better working performance.
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