Subwavelength focusing in bubbly media using broadband time reversal

Thanks to a multiple-scattering theory algorithm, we present a way to focus energy at the deep subwavelength scale, from the far field, inside a cubic disordered bubble cloud by using broadband time reversal (TR). We show that the analytical calculation of an effective wavenumber performing the inde...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-06, Vol.91 (22), Article 224202
Main Authors: Lanoy, Maxime, Pierrat, Romain, Lemoult, Fabrice, Fink, Mathias, Leroy, Valentin, Tourin, Arnaud
Format: Article
Language:English
Subjects:
Algorithms
Broadband
Bubbles
Clouds
Computer simulation
Condensed matter
Mathematical analysis
Microfluidics
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Summary:Thanks to a multiple-scattering theory algorithm, we present a way to focus energy at the deep subwavelength scale, from the far field, inside a cubic disordered bubble cloud by using broadband time reversal (TR). We show that the analytical calculation of an effective wavenumber performing the independent scattering approximation (ISA) matches the numerical results for the focal extension. Subwave length focusings of [lambda]/100 are reported for simulations with perfect bubbles (no loss). A more realistic case, with viscous and thermal losses, allows us to obtain a [lambda]/14 focal spot, with a low volume fraction of scatterers ([Phi] = 10 super(-2)). Bubbly materials could open a new perspective for acoustic actuation in the microfluidic context.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.91.224202