Near-field acoustic imaging with a caged bubble

Dorian Bouchet, Olivier Stephan, Benjamin Dollet, Philippe Marmottant and Emmanuel Bossy ()
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Dorian Bouchet: LIPhy
Olivier Stephan: LIPhy
Benjamin Dollet: LIPhy
Philippe Marmottant: LIPhy
Emmanuel Bossy: LIPhy

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Bubbles are ubiquitous in many research applications ranging from ultrasound imaging and drug delivery to the understanding of volcanic eruptions and water circulation in vascular plants. From an acoustic perspective, bubbles are resonant scatterers with remarkable properties, including a large scattering cross-section and strongly sub-wavelength dimensions. While it is known that the resonance properties of bubbles depend on their local environment, it remains challenging to probe this interaction at the single-bubble level due to the difficulty of manipulating a single resonating bubble in a liquid. Here, we confine a cubic bubble inside a cage using 3D printing technology, and we use this bubble as a local probe to perform scanning near-field acoustic microscopy—an acoustic analog of scanning near-field optical microscopy. By probing the acoustic interaction between a single resonating bubble and its local environment, we demonstrate near-field imaging of complex structures with a resolution that is two orders of magnitudes smaller than the wavelength of the acoustic field. As a potential application, our approach paves the way for the development of low-cost acoustic microscopes based on caged bubbles.

Date: 2024
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DOI: 10.1038/s41467-024-54693-1

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