Shao Meng, Zhang Shuhe, Zhou Jinhua, Ren Yu-Xuan
Opt Express. 2019 Sep 30;27(20):27459-27476. doi: 10.1364/OE.27.027459.
The ray-optics (RO) model is a reasonable method to calculate optical force in geometrical optics regime. However, the RO model fails to calculate the optical force produced by diffractive optical field and other arbitrary structured light beams. We propose the Fourier ray (FR) method to calculate the optical force for arbitrary incident beams. Combining the Fourier optics and the geometrical optics, the FRs are defined as rays that inlay on the plane waves weighted by the Fourier angular spectrum of the incident beam. According to traditional RO model and FR method, we can analyze optical forces on a microsphere immersed in various beams. To validate the FR method, forces of the fundamental Gaussian beam and Airy beam are respectively calculated and compared with traditional method. In addition, optical forces in three arbitrary structured light beams are demonstrated as well. Our simulations show that the FR method is able to evaluate the optical forces generated by diffractive optical field and complex structured light beams, and give a solid prediction of their trapping performances. In RO regime, the Fourier ray method is a universal method to predict the interaction between bead and complex optical field.
光线光学（RO）模型是在几何光学领域计算光力的一种合理方法。然而，RO模型无法计算衍射光场和其他任意结构光束产生的光力。我们提出了傅里叶光线（FR）方法来计算任意入射光束的光力。将傅里叶光学与几何光学相结合，FR被定义为镶嵌在由入射光束的傅里叶角谱加权的平面波上的光线。根据传统的RO模型和FR方法，我们可以分析浸没在各种光束中的微球上的光力。为了验证FR方法，分别计算了基模高斯光束和艾里光束的力，并与传统方法进行了比较。此外，还展示了三种任意结构光束中的光力。我们的模拟表明，FR方法能够评估衍射光场和复杂结构光束产生的光力，并对其捕获性能给出可靠的预测。在RO领域，傅里叶光线方法是预测珠子与复杂光场相互作用的通用方法。
