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Generating arbitrary ultrasound fields with tailored optoacoustic surface profiles

Brown, MD; Nikitichev, DI; Treeby, BE; Cox, BT; (2017) Generating arbitrary ultrasound fields with tailored optoacoustic surface profiles. APPLIED PHYSICS LETTERS , 110 (9) , Article 094102. 10.1063/1.4976942. Green open access

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Abstract

Acoustic fields with multiple foci have many applications in physical acoustics ranging from particle manipulation to neural modulation. However, the generation of multiple foci at arbitrary locations in three-dimensional is challenging using conventional transducer technology. In this work, the optical generation of acoustic fields focused at multiple points using a single optical pulse is demonstrated. This is achieved using optically absorbing surface profiles designed to generate specific, user-defined, wavefields. An optimisation approach for the design of these tailored surface profiles is developed. This searches for a smoothly varying surface that will generate a high peak pressure at a set of target focal points. The designed surface profiles are then realised via a combination of additive manufacturing and absorber deposition techniques. Acoustic field measurements from a sample designed to generate the numeral “7” are used to demonstrate the design method.

Type: Article
Title: Generating arbitrary ultrasound fields with tailored optoacoustic surface profiles
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4976942
Publisher version: http://dx.doi.org/10.1063/1.4976942
Language: English
Additional information: All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics, ACOUSTIC ELEMENTS, HOLOGRAMS, Optical pulse generation, 3D printing, Sound pressure, Surface patterning, Focal points
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1550378
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