Acoustic metasurface-based perfect absorber with deep subwavelength thickness

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Dark acoustic metamaterials as super absorbers for low-frequency sound.

Jun Mei, Guancong Ma, Min Yang … (2012)

The attenuation of low-frequency sound has been a challenging task because the intrinsic dissipation of materials is inherently weak in this regime. Here we present a thin-film acoustic metamaterial, comprising an elastic membrane decorated with asymmetric rigid platelets that aims to totally absorb low-frequency airborne sound at selective resonance frequencies ranging from 100-1,000 Hz. Our samples can reach almost unity absorption at frequencies where the relevant sound wavelength in air is three orders of magnitude larger than the membrane thickness. At resonances, the flapping motion of the rigid platelets leads naturally to large elastic curvature energy density at their perimeter regions. As the flapping motions couple only minimally to the radiation modes, the overall energy density in the membrane can be two-to-three orders of magnitude larger than the incident wave energy density at low frequencies, forming in essence an open cavity.

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Acoustic metasurface with hybrid resonances.

Guancong Ma, Min Yang, Songwen Xiao … (2014)

An impedance-matched surface has the property that an incident wave generates no reflection. Here we demonstrate that by using a simple construction, an acoustically reflecting surface can acquire hybrid resonances and becomes impedance-matched to airborne sound at tunable frequencies, such that no reflection is generated. Each resonant cell of the metasurface is deep-subwavelength in all its spatial dimensions, with its thickness less than the peak absorption wavelength by two orders of magnitude. As there can be no transmission, the impedance-matched acoustic wave is hence either completely absorbed at one or multiple frequencies, or converted into other form(s) of energy, such as an electrical current. A high acoustic-electrical energy conversion efficiency of 23% is achieved.

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Membrane-Type Acoustic Metamaterial with Negative Dynamic Mass

Z. Yang, Jun Mei, Min Yang … (2008)

We present the experimental realization and theoretical understanding of a membrane-type acoustic metamaterial with very simple construct, capable of breaking the mass density law of sound attenuation in the 100-1000 Hz regime by a significant margin ( approximately 200 times). Owing to the membrane's weak elastic moduli, there can be low-frequency oscillation patterns even in a small elastic film with fixed boundaries defined by a rigid grid. The vibrational eigenfrequencies can be tuned by placing a small mass at the center of the membrane sample. Near-total reflection is achieved at a frequency between two eigenmodes where the in-plane average of normal displacement is zero. By using finite element simulations, negative dynamic mass is explicitly demonstrated at frequencies around the total reflection frequency. Excellent agreement between theory and experiment is obtained.

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Author and article information

Journal

Title: Applied Physics Letters

Abbreviated Title: Appl. Phys. Lett.

Publisher: AIP Publishing

ISSN (Print): 0003-6951

ISSN (Electronic): 1077-3118

Publication date Created: February 08 2016

Publication date (Print): February 08 2016

Volume: 108

Issue: 6

Page: 063502

Article

DOI: 10.1063/1.4941338

SO-VID: 51e0b602-14c7-404a-8821-0b280d7527e1

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