基于FDTD对尖端为轴锥体的光纤光镊的模拟分析

Simulation and analysis of the axicon tipped optical fiber tweezers based on FDTD

基于动量守恒,采用时域有限差分法(FDTD),仿真模拟了光纤光镊轴锥角和工作距离关系及捕获力大小和轴锥角的关系.结果表明工作距离和捕获力的大小和轴锥角度的大小有着密切的关系.模拟结果与其它相关文件报道的实验结果基本相符合.

Based on the conservation of momentum and using the finite difference time domain （FDTD） method, we calculated and simulated the optimal angle of the axicon tip as a function of the working dis- tanee and the dependence of axial optical force on tip angle of tapered optical fiber. The result show that with the increasing working distance, the optimal axicon tip angle grows, while the trapping force changed differently. The simulation results are in good agreement with the experiment observation.