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Shaping reverberating sound fields with an actively tunable metasurface [Engineering]

Wavefront shaping with spatial light modulators has recently motivated many studies in the field of light manipulation in diffusive media. Here, we extend this concept to acoustic waves by designing and building a binary phase-modulating spatial sound modulator (SSM). The SSM is an acoustic metasurface consisting of unit cells with two states, switchable through programmed electronics. We demonstrate in audible frequencies, and in a reverberating environment, the capability of controlling and reshaping any complex sound field. Our work will not only open avenues to study wave propagation in complex and chaotic media but also inspire applications in acoustic engineering.

Authors:   Guancong Ma; Xiying Fan; Ping Sheng; Mathias Fink
Journal:   Proceedings of the National Academy of Sciences current issue
Volume:   115
edition:   26
Year:   2018
Pages:   6638
DOI:   10.1073/pnas.1801175115
Publication date:   26-Jun-2018
Facts, background information, dossiers
  • acoustic waves
More about Proceedings of the National Academy of Sciences
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