META 2021, META'12

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Phonofluidic properties of Phononic Crystal Waveguides
Rab Wilson, Julien Reboud, Yannyk Bourquin, Yi Zhang, Jon M Cooper

Last modified: 2012-03-04


We excite a cavity mode in a phononic crystal waveguide to trap and manipulate a droplet on a superstrate using surface acoustic waves (SAW) produced by a single interdigitated transducer (IDT) on LiNbO3. The cavity mode can be thought of as a stationary acoustic feature that gives rise to Langevin acoustic radiation pressure, the gradient of this pressure either induces movement of the drop towards the global antinode or pins it. This gives rise to an asymmetry in the velocity of the droplet relative to the direction to the SAW propagation. The magnitude of the force could be tuned using frequency allowing the droplet to escape from the acoustic trap and proceed to along the superstrate. Indeed the displacement of the drop could be finely controlled using frequency, moving the antinode position, such that we can obtain substantial control over the position of the drop via a single IDT.


metamaterial; phononic crystal; microfluidics