Acoustic tweezers for sub-MM microparticle manipulation
Acoustic tweezers for sub-MM microparticle manipulation
复制标题
用于亚毫米级微粒操作的声学镊子
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
E. S. Kim
中科院分区：
文献类型：
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作者：
Lurui Zhao;E. S. Kim
本文报道了一种声学镊子的新设计，它可以通过大量液体中形成的 3 维能量捕获直径达 0.5 毫米的微粒。声学镊子构建在 1.02 毫米厚的锆钛酸铅 (PZT) 基板上，具有对称扇形（从顶部看呈饼形）气腔菲涅尔透镜。每个扇区被设计为具有不同的焦距，使得来自不同扇区的声波相互干扰，从而沿着垂直于换能器表面的中心线产生贝塞尔波束区（具有负轴向辐射力）。负辐射力捕获并保留粒子。所制造的工作频率为 2.07 MHz 的声学镊子已成功证明可以在距换能器表面 5 mm 处捕获直径 0.3 至 0.5 mm 的聚乙烯微球，从而提供了一种远程操纵大尺寸微粒的方法，而无需与任何刚体进行物理接触。
This paper reports a new design of an acoustic tweezers that can trap microparticles up to 0.5 mm in diameter through a 3-dimensional energy well formed in a bulk of liquid. The acoustic tweezers is built on a 1.02 mm thick lead zirconate titanate (PZT) substrate, with symmetric sectors (pie shaped when viewed from top) of air-cavity Fresnel lens. Each of the sectors is designed to have a different focal length, so that the acoustic waves from different sectors interfere with each other such that they produce a Bessel beam zone (with negative axial radiation force) along the center line perpendicular to the transducer surface. The negative radiation force traps and holds particles. The fabricated acoustic tweezers operating at 2.07 MHz has successfully been shown to trap polyethylene microsphere from 0.3 to 0.5 mm in diameter at 5 mm away from the transducer surface, providing a way to remotely manipulate large-size microparticles without physical contact to any rigid body.