同步球形声涡对小颗粒的三维捕获与组装
Three-dimensional trapping and assembly of small particles with synchronized spherical acoustical vortices
摘要：
微物体和微生物的三维无害无接触操纵和组装将在微机器人和微生物学中开辟新的视野，例如用于微系统组装或组织工程。在我们以前的工作中[Gong和Baudoin，Phys.Rev.Appl.，十二日：024045（2019）]，我们在理论上研究了与基于圆柱形声学涡旋的同步声学镊子的波长相比在二维中捕获和组装小颗粒的可能性。然而，由于这些波场沿着它们的中心轴是渐进的，它们只能在这个方向上推动或拉动（而不是捕获）粒子，因此主要限于2D操作。在本文中，我们扩展了我们以前的分析，并从理论上表明，粒子可以被捕获和组装在三维同步球形涡。我们表明，粒子可以接近横向和轴向，我们确定的最大组装速度通过平衡斯托克斯的阻力和临界辐射力。这些理论结果为设计能够在三维空间中捕获和组装颗粒的选择性声镊提供了指导。
英文摘要：
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.
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