摆线光束的微粒等间距操控(特邀)

Equal spacing control of particle via cycloidal beam (Invited)

  • 摘要: 轨道角动量(OAM)的发现为光镊的研究开辟了新的道路。但具有OAM的光束在操纵微粒时,由于生物细胞不可能大小形状完全相同,所以当其进行旋转等操作时,粒子运动速度的不均匀会导致粒子之间的间距不可控。针对该问题,首先通过任意曲线塑形技术,并为传统摆线公式附加曲率调控参数提出了一种调控模式丰富的摆线光束,理论分析了该光束的OAM和梯度力,证明了解决上述问题的可能性。最后在实验中实现了粒子在运动过程中的启停,且成功操纵三个粒子进行等间距旋转,实验测得三个微粒在整个旋转过程中间距变化的误差可以维持在纳米级。这项工作为未来光捕获和操纵多种微粒在其他领域的应用铺平了道路,特别是在生物科学领域。

     

    Abstract: The discovery of orbital angular momentum (OAM) opens up a new way for the study of optical tweezers. However, the size and shape of biological cells cannot be exactly the same, when the beam with OAM manipulates the particles. So, the uneven velocity of the particles will lead to uncontrollable spacing between the particles when it carries out operations such as rotation. To solve the problem, a cycloid beam with rich regulation modes was proposed by using an arbitrary curve shaping technique and adding curvature control parameters to the traditional cycloid formula. The OAM and gradient force of the cycloid beam was theoretically analyzed, and the possibility of solving the problem was theoretically analyzed. Finally, the start and stop of particles in the process of motion were realized in the experiment, and the three particles were successfully manipulated to rotate at the same distance. The experimental results show that the error of the distance variation of the three particles during the whole rotation process can be maintained at the nanometer level. The work paves the way for future applications of light to capture and manipulate a variety of particles in other fields, particularly in the biological sciences.

     

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