Acoustic metamaterials for new two-dimensional sonic devices

By D. Torrent, José Sánchez-Dehesa. 2007

242 citations recorded by the source corpus.

It has been shown that two-dimensional arrays of rigid or fluidlike cylinders in a fluid or a gas define, in the limit of large wavelengths, a class of acoustic metamaterials whose effective parameters (sound velocity and density) can be tailored up to a certain limit. This work goes a step further by considering arrays of solid cylinders in which the elastic properties of cylinders are taken into account. We have also treated mixtures of two different elastic cylinders. It is shown that both effects broaden the range of acoustic parameters available for designing metamaterials. For example, it is predicted that metamaterials with perfect matching of impedance with air are now possible by using aerogel and rigid cylinders equally distributed in a square lattice. As a potential application of the proposed metamaterial, we present a gradient index lens for airborne sound (i.e. a sonic Wood lens) whose functionality is demonstrated by multiple scattering simulations.

Subfields: Biomedical Engineering, Electronic, Optical and Magnetic Materials, Speech and Hearing

View Paper: https://www.semanticscholar.org/paper/9b5e195d9565b4fef9119c816c741d028c0ffb3f

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In Biomedical Engineering

In Electronic, Optical and Magnetic Materials

In Speech and Hearing

Citations in the corpus

Anisotropic Complementary Acoustic Metamaterial for Canceling out Aberrating Layers (2014, background): “CMMs are also expected to be useful for the design of acoustic cloaking [32] and all-angle antireflection materials [33,34].”
Metamaterial-inspired structures and concepts for elastoacoustic wave energy harvesting (2013, background): “These abilities have been exploited for the design of innovative actuators and sensors, and elements of logic circuitry based on the propagation of elastic waves [30, 31].”
Acoustic cloaking in two dimensions: a feasible approach (2008, methodology): “column reports the effective velocity of the elastic cylinder [9]; c = √ c2 ` − c 2 t , where c` and ct are the longitudinal and transverse velocities, respectively.”