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Sensors 2016, 16(11), 1973; doi:10.3390/s16111973

Design of Fresnel Lens-Type Multi-Trapping Acoustic Tweezers

Department of Mechanical Engineering, National Central University, Taoyuan 32001, Taiwan
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Author to whom correspondence should be addressed.
Academic Editor: Dipen N. Sinha
Received: 16 September 2016 / Revised: 8 November 2016 / Accepted: 17 November 2016 / Published: 23 November 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3093 KB, uploaded 23 November 2016]   |  

Abstract

In this paper, acoustic tweezers which use beam forming performed by a Fresnel zone plate are proposed. The performance has been demonstrated by finite element analysis, including the acoustic intensity, acoustic pressure, acoustic potential energy, gradient force, and particle distribution. The acoustic tweezers use an ultrasound beam produced by a lead zirconate titanate (PZT) transducer operating at 2.4 MHz and 100 Vpeak-to-peak in a water medium. The design of the Fresnel lens (zone plate) is based on air reflection, acoustic impedance matching, and the Fresnel half-wave band (FHWB) theory. This acoustic Fresnel lens can produce gradient force and acoustic potential wells that allow the capture and manipulation of single particles or clusters of particles. Simulation results strongly indicate a good trapping ability, for particles under 150 µm in diameter, in the minimum energy location. This can be useful for cell or microorganism manipulation. View Full-Text
Keywords: acoustic tweezers; Fresnel lens; particle trapping acoustic tweezers; Fresnel lens; particle trapping
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tu, Y.-L.; Chen, S.-J.; Hwang, Y.-R. Design of Fresnel Lens-Type Multi-Trapping Acoustic Tweezers. Sensors 2016, 16, 1973.

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