Opt Lett. 2022 Feb 15;47(4):826-829. doi: 10.1364/OL.447861.
This Letter reports ring-shaped photoacoustic (PA) tweezers that are capable of manipulating single or multiple micron-sized particles. By illuminating a thin layer of an optically absorptive liquid medium with a focused annular pulsed laser beam and a higher pulse repetition rate (e.g., 800 Hz), both acoustic radiation force and instantaneous vaporization repulsion are generated within a certain distance of the illumination region. This makes it possible to conduct continuous and versatile locomotion of single or multiple microparticles. In this Letter, interactions between two or more particles are demonstrated, such as separation, attachment, and grouping of microparticles. The PA tweezers combine some of the advantages of conventional optical and acoustic tweezers and are expected to be a useful alternative approach for the manipulation of microscale objects.
这封信件报告了一种能够操纵单个或多个微米大小颗粒的环形光声（PA）镊子。通过用聚焦的环形脉冲激光束和更高的脉冲重复率（例如 800 Hz）照射一层薄的光吸收液体介质，可以在照明区域的一定距离内产生声辐射力和瞬时蒸汽排斥力。这使得对单个或多个微粒子进行连续和多样化的运动成为可能。在本信件中，展示了两个或更多粒子之间的相互作用，例如微粒子的分离、附着和聚集。PA 镊子结合了传统光学和声学镊子的一些优点，有望成为操纵微尺度物体的一种有用的替代方法。
