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光束的光瞳函数是影响粒子捕获性能的重要因素,也是光镊系统设计及结构优化的关键。简要介绍了几何光线理论模型,并基于该模型研究了五种偏振光束在三种典型光瞳函数情况下的捕获力空间分布规律,获得了不同参数光瞳函数情况下捕获效率的空间分布。结果表明,在调制因子较小的情况下,光瞳函数对不同偏振态光束的捕获效率影响较小,光束的偏振态是决定光束捕获性能的主要因素,但当光束调控因子较大时,光瞳函数的形式对于光束的捕获效率将产生很重要的影响,包括产生多个捕获平衡位置,而偏振态分布不再是主要的决定因素。研究成果为光学捕获的研究及应用提供了更为丰富的技术支持。
The pupil function of the light beam is an important factor affecting the particle trapping performance and also the key to the design and structure optimization of the optical tweezers system. The theoretical model of geometric light is briefly introduced. Based on this model, the spatial distribution of the trapping forces of the five kinds of polarized beams under the three typical pupil functions is studied. The spatial distribution of the acquisition efficiency under the different parameters of the pupil function is obtained. The results show that the pupil function has a small effect on the capture efficiency of different polarization states when the modulation factor is small, and the polarization state of the beam is the main factor that determines the beam trapping performance. However, when the modulation factor is relatively large, The pupil function form will have a significant impact on the beam trapping efficiency, including the creation of multiple capture equilibrium positions, while the polarization distribution is no longer the primary determinant. The research results provide more abundant technical support for the research and application of optical capture.