多涡旋相位径向矢量光束紧聚焦产生多聚焦光斑

Multi-focus spot generated by radial vector beam with multivortex phase

对加载对称四涡旋相位的高斯径向矢量光束的紧聚焦特性进行了理论和模拟实验研究。在径向矢量光场加载对称的四个涡旋相位,并调节涡旋相位中心奇点与光场中心的距离,基于理查德沃尔夫矢量衍射理论进行紧聚焦。研究结果表明,在涡旋相位中心与光场中心距离为0.62 w的情况下,聚焦场中得到了5个焦斑的结果,改变涡旋相位间的距离可以调节中心聚焦斑与周围4个聚焦斑的能量分布。

In this paper, a theoretical and simulated experimental study on the tight focusing properties of radial vector Gaussian beam loaded with symmetrical four vortex phases is presented. This is the process： loading a symmetrical four vortex phase in the radial vector optical field, adjusting the distance between the singularity of the vortex phase center and the optical field center, and then compact focusing based on the Vector diffraction theory proposed by Richards and Wolf. The results prove that, when the distance between the singularity of the vortex phase center and the optical field center is 0.62w, five focal spots can be obtained. And the energy distribution of the focal spot can be regulated by adjusting the distance between the vortex phase. This research can be applied to the area of ultra-fast laser micro machining, multi-particle trapping, optical tweezers and etc.