Song Xianlin, Wei Jianshuang, Teng Ao, Zhao Aojie
Opt Express. 2021 May 24;29(11):17304-17315. doi: 10.1364/OE.421852.
Axial optical chain (optical bottle beams) beams are widely used in optical micromanipulation, atom trapping, guiding and binding of microparticles and biological cells, etc. However, the generation of axial optical chain beams are not very flexible at present, and its important characteristics such as periodicity and phase shift cannot be easily regulated. Here, we propose a holographic method to achieve the axial optical chain beams with controllable periodicity and phase. A double annular phase diagram is generated based on the gratings and lenses algorithms. The beam incident to the double annular slits was tilted from the optical axis to produce concentric double annular beams. The annular beam with different radius will produce the zero-order Bessel beam with different axial wave vector. Axial optical chain beams is produced by interference of two zero-order Bessel beams with different axial wave vectors. The phase and periodicity of the axial optical chain beams can be changed by changing the initial phase difference and radius of the double annular slits of the double annular phase diagram, respectively. The feasibility and effectiveness of the proposed method are demonstrated by theoretical numerical analysis and experiments. This method will further expand the application of axial optical chain beams in optical tweezers, optical modulation and other fields.
轴向光链（光学瓶形光束）在光学微操纵、原子捕获、微粒和生物细胞的引导与束缚等方面有着广泛应用。然而，目前轴向光链光束的产生方式不够灵活，其诸如周期性和相移等重要特性难以轻易调控。在此，我们提出一种全息方法来实现具有可控周期性和相位的轴向光链光束。基于光栅和透镜算法生成双环形相位图。入射到双环形狭缝的光束从光轴倾斜以产生同心双环形光束。不同半径的环形光束会产生具有不同轴向波矢的零阶贝塞尔光束。轴向光链光束由两个具有不同轴向波矢的零阶贝塞尔光束干涉产生。通过分别改变双环形相位图中双环形狭缝的初始相位差和半径，可改变轴向光链光束的相位和周期性。理论数值分析和实验验证了该方法的可行性和有效性。此方法将进一步拓展轴向光链光束在光镊、光调制等领域的应用。
