Acoustic meta-atom with experimentally verified maximum Willis coupling

Anton Melnikov (), Yan Kei Chiang, Li Quan, Sebastian Oberst, Andrea Alù, Steffen Marburg and David Powell ()
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Anton Melnikov: Technical University of Munich
Yan Kei Chiang: University of New South Wales
Li Quan: The University of Texas at Austin
Sebastian Oberst: Acoustics and Vibration University of Technology Sydney
Andrea Alù: The University of Texas at Austin
Steffen Marburg: Technical University of Munich
David Powell: University of New South Wales

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Acoustic metamaterials are structures with exotic acoustic properties, with promising applications in acoustic beam steering, focusing, impedance matching, absorption and isolation. Recent work has shown that the efficiency of many acoustic metamaterials can be enhanced by controlling an additional parameter known as Willis coupling, which is analogous to bianisotropy in electromagnetic metamaterials. The magnitude of Willis coupling in a passive acoustic meta-atom has been shown theoretically to have an upper limit, however the feasibility of reaching this limit has not been experimentally investigated. Here we introduce a meta-atom with Willis coupling which closely approaches this theoretical limit, that is much simpler and less prone to thermo-viscous losses than previously reported structures. We perform two-dimensional experiments to measure the strong Willis coupling, supported by numerical calculations. Our meta-atom geometry is readily modeled analytically, enabling the strength of Willis coupling and its peak frequency to be easily controlled.

Date: 2019
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DOI: 10.1038/s41467-019-10915-5

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