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采用一种基于时域有限差分(FDTD)的数值算法,仿真计算了抛物线形和大锥角形两种新型单光纤光镊的出射光场,并在稳态场下通过对麦克斯韦应力张量积分求得介质球在两种光场中受到的光阱力,得到大锥角型光纤端产生的光阱力较大的结论;讨论了不同介质球大小、折射率,光纤探针形状对光阱力的影响。在实验中这两种光纤探针都实现了对水中酵母菌细胞的捕获,且采用流体力学法对抛物线形和大锥角形二种新型单光纤光镊产生的光阱力进行了标定。结果表明:基于FDTD数值仿真方法计算受力与实验结果一致,并且这种计算光纤光镊产生的光阱力的方法简单,适用;且抛物线形和大锥角形光纤探头都具备构成单光纤光镊的条件。
A numerical algorithm based on finite difference time domain (FDTD) is used to simulate the emergent light field of two new types of single-fiber optical tweezers with parabolic and large taper angles. In the steady-state field, Maxwell stress tensor integral We get the optical trapping force of medium sphere in two kinds of light field and get the conclusion that the optical trapping force produced by the large cone angle fiber end is larger. The effects of different medium sphere size, refractive index and fiber probe shape on light trapping force Impact. In the experiments, both of the two kinds of optical fiber probes were used to capture the yeast cells in water, and the optical trapping force of two new types of single-fiber optical tweezers with parabolic and large taper angles was calibrated by the method of fluid mechanics. The results show that the force calculation based on FDTD numerical simulation method is in good agreement with the experimental results. The method of calculating the optical trapping force generated by the optical fiber tweezers is simple and applicable. Both the parabolic and large-angle fiber optic probes have the advantages of forming a single optical fiber tweezers conditions of.