Observation of a Single-Beam Gradient Force Acoustical Trap for Elastic Particles: Acoustical Tweezers
Observation of a Single-Beam Gradient Force Acoustical Trap for Elastic Particles: Acoustical Tweezers
复制标题
DOI：
10.1103/physrevlett.116.024301
复制
发表时间：
2016-01-11
影响因子：
8.6
通讯作者：
Marchiano, Regis
中科院分区：
文献类型：
--
作者：
Baresch, Diego;Thomas, Jean-Louis;Marchiano, Regis
我们证明了捕获的弹性粒子的大梯度力的一个单一的声束在三维空间。声学镊子可以推拉并精确控制施加在独特颗粒上的位置和力。超过1微牛顿的力施加在亚毫米范围内的聚苯乙烯珠上。需要小于50 W/cm（2）的光束强度，以确保无损伤的捕获条件。相干超声源覆盖的大频谱频率提供了从宏观到微观长度尺度的各种各样的操纵可能性。我们的观察可能会开辟重要的应用，特别是在生物学和生物物理学在细胞尺度和微流体环境中的声学机器的设计。
We demonstrate the trapping of elastic particles by the large gradient force of a single acoustical beam in three dimensions. Acoustical tweezers can push, pull and accurately control both the position and the forces exerted on a unique particle. Forces in excess of 1 micronewton were exerted on polystyrene beads in the submillimeter range. A beam intensity less than 50 W/cm(2) was required, ensuring damage-free trapping conditions. The large spectrum of frequencies covered by coherent ultrasonic sources provides a wide variety of manipulation possibilities from macroscopic to microscopic length scales. Our observations could open the way to important applications, in particular, in biology and biophysics at the cellular scale and for the design of acoustical machines in microfluidic environments.