Two-dimensional manipulation of micro particles by acoustic radiation pressure in a heptagon cell

A. L. Bernassau, Chun-Kiat Ong, Yong Ma, P. G. A. Macpherson, C. R. P. Courtney, M. Riehle, B. W. Drinkwater, D. R. S. Cumming

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23 Citations (Scopus)
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An acoustic particle manipulation system is presented, using a flexible printed circuit board formed into a regular heptagon. It is operated at 4 MHz and has a side dimension of 10 mm. The heptagonal geometry was selected for its asymmetry, which tends to reduce standing wave behavior. This leads to the possibility of having fine control over the acoustic field by varying the output phases of the transducer elements. Configurations with two and three active transducers are demonstrated experimentally. It is shown that with two transducers, the particles align along straight lines, the position of which can be moved by varying the relative excitation phases of the two transducers. With three active transducers, hexagonal-shaped patterns are obtained that can also be moved, again according to the phase of the excitation signals. Huygens' principle-based simulations were used to investigate the resultant pressure distributions. Good agreement was achieved between these simulations and both Schlieren imaging and particle manipulation observations.
Original languageEnglish
Pages (from-to)2132-2138
Number of pages7
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number10
Publication statusPublished - Oct 2011


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