Independent trapping and manipulation of microparticles using dexterous acoustic tweezers

An electronically controlled acoustic tweezer was used to demonstrate two acoustic manipulation phenomena: superposition of Bessel functions to allow independent manipulation of multiple particles and the use of higher-order Bessel functions to trap particles in larger regions than is possible with...

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Bibliographic Details
Published in:Applied physics letters 2014-04, Vol.104 (15), p.154103
Main Authors: Courtney, Charles R. P., Demore, Christine E. M., Wu, Hongxiao, Grinenko, Alon, Wilcox, Paul D., Cochran, Sandy, Drinkwater, Bruce W.
Format: Article
Language:English
Subjects:
Acoustics
Applied physics
BESSEL FUNCTIONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
FLUIDS
Microparticles
PARTICLES
POLYSTYRENE
SOUND WAVES
SPHERES
Superposition (mathematics)
TRAPPING
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Summary:An electronically controlled acoustic tweezer was used to demonstrate two acoustic manipulation phenomena: superposition of Bessel functions to allow independent manipulation of multiple particles and the use of higher-order Bessel functions to trap particles in larger regions than is possible with first-order traps. The acoustic tweezers consist of a circular 64-element ultrasonic array operating at 2.35 MHz which generates ultrasonic pressure fields in a millimeter-scale fluid-filled chamber. The manipulation capabilities were demonstrated experimentally with 45 and 90-μm-diameter polystyrene spheres. These capabilities bring the dexterity of acoustic tweezers substantially closer to that of optical tweezers.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4870489