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  Acoustic hologram enhanced phased arrays for ultrasonic particle manipulation

Cox, L., Melde, K., Croxford, A., Fischer, P., & Drinkwater, B. W. (2019). Acoustic hologram enhanced phased arrays for ultrasonic particle manipulation. Physical Review Applied, 12(6): 064055, pp. 064055-1-064055-9. doi:10.1103/PhysRevApplied.12.064055.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000B-2EB7-4 Version Permalink: https://hdl.handle.net/21.11116/0000-000E-4C2F-A
Genre: Journal Article

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 Creators:
Cox, Luke, Author
Melde, Kai, Author
Croxford, Anthony, Author
Fischer, Peer1, Author                 
Drinkwater, Bruce W., Author
Affiliations:
1Max Planck Institute for Medical Research, Max Planck Society, ou_1125545              

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 Abstract: The ability to shape ultrasound fields is important for particle manipulation, medical therapeutics, and imaging applications. If the amplitude and/or phase is spatially varied across the wave front, then it is possible to project “acoustic images.” When attempting to form an arbitrary desired static sound field, acoustic holograms are superior to phased arrays due to their significantly higher phase fidelity. However, they lack the dynamic flexibility of phased arrays. Here, we demonstrate how to combine the high-fidelity advantages of acoustic holograms with the dynamic control of phased arrays in the ultrasonic frequency range. Holograms are used with a 64-element phased array, driven with continuous excitation. Movement of the position of the projected hologram via phase delays that steer the output beam is demonstrated experimentally. This allows the creation of a much more tightly focused point than with the phased array alone, while still being reconfigurable. It also allows the complex movement at a water-air interface of a “phase surfer” along a phase track or the manipulation of a more arbitrarily shaped particle via amplitude traps. Furthermore, a particle manipulation device with two emitters and a single split hologram is demonstrated that allows the positioning of a “phase surfer” along a one-dimensional axis. This paper opens the door for new applications with complex manipulation of ultrasound while minimizing the complexity and cost of the apparatus.

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Language(s): eng - English
 Dates: 2019-11-132019-10-042019-12-26
 Publication Status: Issued
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevApplied.12.064055
BibTex Citekey: Cox2019
 Degree: -

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Title: Physical Review Applied
  Abbreviation : Phys. Rev. Appl.
Source Genre: Journal
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Publ. Info: College Park, Md. [u.a.] : American Physical Society
Pages: - Volume / Issue: 12 (6) Sequence Number: 064055 Start / End Page: 064055-1 - 064055-9 Identifier: ISSN: 2331-7019
CoNE: https://pure.mpg.de/cone/journals/resource/2331-7019