论文标题
小颗粒的三维捕获和组装，带有同步球形声学涡旋
Three-dimensional trapping and assembly of small particles with synchronized spherical acoustical vortices
论文作者
论文摘要
三维无害接触式操纵和微观对象和微生物的组装将在微生物学和微生物学上开放新的视野，例如用于微系统组件或组织工程。在我们以前的作品中[Gong and Baudoin，Phys。 Rev. Appl。，12：024045（2019）]，与波长相比，我们研究了基于圆柱声涡旋的同步声学镊子，从理论上研究了陷阱和组装的可能性。但是，由于这些波场是沿着中央轴进行的，因此它们只能向这个方向推或拉动（不是陷阱）颗粒，因此主要限于2D操作。在本文中，我们扩展了先前的分析，并从理论上证明可以用同步的球形涡旋将颗粒捕获和组装。我们表明，粒子可以横向和轴向接近，并通过平衡Stokes的阻力和临界辐射力来确定最大装配速度。这些理论结果提供了设计能够在三个维度上捕获和组装颗粒的选择性声学镊子的指南。
Three-dimensional harmless contactless manipulation and assembly of micro-objects and micro-organisms would open new horizons in microrobotics and microbiology, e.g. for microsystems assembly or tissue engineering. In our previous work [Gong and Baudoin, Phys. Rev. Appl., 12: 024045 (2019)], we investigated theoretically the possibility to trap and assemble in two dimensions small particles compared to the wavelength with synchronized acoustical tweezers based on cylindrical acoustical vortices. However, since these wavefields are progressive along their central axis, they can only push or pull (not trap) particles in this direction and hence are mainly limited to 2D operations. In this paper, we extend our previous analysis and show theoretically that particles can be trapped and assembled in three-dimensions with synchronized spherical vortices. We show that the particles can be approached both laterally and axially and we determine the maximum assembly speed by balancing the Stokes' drag force and the critical radiation force. These theoretical results provide guidelines to design selective acoustical tweezers able to trap and assemble particles in three dimensions.
