Acoustic Hologram Enhanced Phased Arrays for Ultrasonic Particle Manipulation
Acoustic Hologram Enhanced Phased Arrays for Ultrasonic Particle Manipulation
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DOI：
10.1103/physrevapplied.12.064055
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发表时间：
2019-12-26
影响因子：
4.6
通讯作者：
Drinkwater, Bruce W.
中科院分区：
文献类型：
--
作者：
Cox, Luke;Melde, Kai;Drinkwater, Bruce W.
超声场成形的能力对于粒子操纵、医学治疗和成像应用是重要的。如果振幅和/或相位在波前上是空间变化的，那么就有可能投影“声学图像”。“当试图形成任意所需的静态声场时，声学全息图由于其显着更高的相位保真度而上级相控阵。然而，它们缺乏相控阵列的动态灵活性。在这里，我们演示了如何结合联合收割机的高保真度的优势，声全息图与动态控制的相控阵在超声频率范围。全息图与64元件相控阵一起使用，用连续激励驱动。实验证明了通过相位延迟控制输出光束的投影全息图的位置的移动。这允许创建比单独使用相控阵列更紧密聚焦的点，同时仍然是可重新配置的。它还允许复杂的运动在水-空气界面的“相位冲浪者”沿着相位轨道或操纵一个更任意形状的粒子通过振幅陷阱。此外，粒子操纵装置与两个发射器和一个单一的分裂全息图被证明，允许定位的“相位冲浪”沿着一维轴。本文打开了大门，为新的应用程序与复杂的超声操作，同时最大限度地减少设备的复杂性和成本。
The ability to shape ultrasound fields is important for particle manipulation, medical therapeutics, and imaging applications. If the amplitude and/or phase is spatially varied across the wave front, then it is possible to project "acoustic images." When attempting to form an arbitrary desired static sound field, acoustic holograms are superior to phased arrays due to their significantly higher phase fidelity. However, they lack the dynamic flexibility of phased arrays. Here, we demonstrate how to combine the high-fidelity advantages of acoustic holograms with the dynamic control of phased arrays in the ultrasonic frequency range. Holograms are used with a 64-element phased array, driven with continuous excitation. Movement of the position of the projected hologram via phase delays that steer the output beam is demonstrated experimentally. This allows the creation of a much more tightly focused point than with the phased array alone, while still being reconfigurable. It also allows the complex movement at a water-air interface of a "phase surfer" along a phase track or the manipulation of a more arbitrarily shaped particle via amplitude traps. Furthermore, a particle manipulation device with two emitters and a single split hologram is demon-strated that allows the positioning of a "phase surfer" along a one-dimensional axis. This paper opens the door for new applications with complex manipulation of ultrasound while minimizing the complexity and cost of the apparatus.