Efficient counter-propagating wave acoustic micro-particle manipulation

A. Grinenko, C.K. Ong, C.R.P. Courtney, P.D. Wilcox, B.W. Drinkwater

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30 Citations (SciVal)


A simple acoustic system consisting of a pair of parallel singe layered piezoelectric transducers submerged in a fluid used to form standing waves by a superposition of two counter-propagating waves is reported. The nodal positions of the standing wave are controlled by applying a variable phase difference to the transducers. This system was used to manipulate polystyrene micro-beads trapped at the nodal positions of the standing wave. The demonstrated good manipulation capability of the system is based on a lowering of the reflection coefficient in a narrow frequency band near the through-thickness resonance of the transducer plates.
Original languageEnglish
Article number233501
JournalApplied Physics Letters
Issue number23
Publication statusPublished - 3 Dec 2012


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