What is it about?
We show how ultrasonic vortices can be used to trap and move microparticles. In our experiment we use a 16-element array to create ultrasonic vortices and by controlling this acoustic field we are able to control the position of trapped particles. As the vortex field creates a ring of pressure we have termed this an acoustic lasso.
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Why is it important?
The ideas described in the paper have applications in areas such as tissue engineering and materials science where such devices could carefully assemble new structures in a non-contact environment. The breakthrough is that the device described is considerably more dexterous than those previously known. We show that it is possible to trap and move microparticles to arbitrary positions. The concepts developed could be extended to enable many particles to be trapped and moved independently.
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This page is a summary of: Dexterous manipulation of microparticles using Bessel-function acoustic pressure fields, Applied Physics Letters, March 2013, American Institute of Physics,
DOI: 10.1063/1.4798584.
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