Tapered labyrinthine acoustic metamaterials for broadband impedance matching

Xie, Yangbo; Konneker, Adam; Popa, Bogdan Ioan; Cummer, Steven A.

doi:10.1063/1.4831770

Cited by 158 publications

(109 citation statements)

References 23 publications

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“…For example, AM has been used to produce ultra light and stiff structures [374], auxetic structures [51][143] [282] and the molds for the unit cells for auxetic structures [32], and could be used to produce the chiral honeycomb auxetic structures proposed by [177]. It has also been used to produce unit cells for acoustic materials with a negative refraction index [358]. In biomedical engineering, lattices can be optimized for cell attachment and growth; transport of nutrients and metabolic waste; biocompatibility, bioresorbability, and degradation; and biomechanical properties [151].…”

Section: Lattices Trusses and Cellular Materials For Custom Materialsmentioning

confidence: 99%

Design for Additive Manufacturing: Trends, opportunities, considerations, and constraints

et al. 2016

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The past few decades have seen substantial growth in Additive Manufacturing (AM) technologies. However, this growth has mainly been process-driven. The evolution of engineering design to take advantage of the possibilities afforded by AM and to manage the constraints associated with the technology has lagged behind. This paper presents the major opportunities, constraints, and economic considerations for Design for Additive Manufacturing. It explores issues related to design and redesign for direct and indirect AM production. It also highlights key industrial applications, outlines future challenges, and identifies promising directions for research and the exploitation of AM's full potential in industry.Design, Manufacturing, Additive Manufacturing

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Section: Lattices Trusses and Cellular Materials For Custom Materialsmentioning

confidence: 99%

Design for Additive Manufacturing: Trends, opportunities, considerations, and constraints

et al. 2016

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“…A recently proposed category of acoustic metamaterials, termed labyrinthine metamaterials 14,21,22 , shows promise as building blocks for such wavefront-shaping metasurfaces. This family of unit cells features high energy throughput, broad complex (amplitude and phase) modulation range and non-resonant dispersion.…”

Section: Engineering Surface Phase Gradient and Anomalous Refractionmentioning

confidence: 99%

Wavefront modulation and subwavelength diffractive acoustics with an acoustic metasurface

et al. 2014

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Metasurfaces are a family of novel wavefront-shaping devices with planar profile and subwavelength thickness. Acoustic metasurfaces with ultralow profile yet extraordinary wave manipulating properties would be highly desirable for improving the performance of many acoustic wave-based applications. However, designing acoustic metasurfaces with similar functionality to their electromagnetic counterparts remains challenging with traditional metamaterial design approaches. Here we present a design and realization of an acoustic metasurface based on tapered labyrinthine metamaterials. The demonstrated metasurface can not only steer an acoustic beam as expected from the generalized Snell's law, but also exhibits various unique properties such as conversion from propagating wave to surface mode, extraordinary beam-steering and apparent negative refraction through higher-order diffraction. Such designer acoustic metasurfaces provide a new design methodology for acoustic signal modulation devices and may be useful for applications such as acoustic imaging, beam steering, ultrasound lens design and acoustic surface wave-based applications.

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“…A class of metafluids based on the concept of space coiling have also featured prominently in the literature [33][34][35][36]. Space-coiled Fresnel lens designs are reported that show significant focusing while utilizing a thin aperture compared to the wavelength [26,27].…”

Section: Discussionmentioning

confidence: 99%

Transparent Gradient-Index Lens for Underwater Sound Based on Phase Advance

et al. 2015

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Spatial gradients in a refractive index are used extensively in acoustic metamaterial applications to control wave propagation through phase delay. This study reports the design and experimental realization of an acoustic gradient-index lens using a sonic crystal lattice that is impedance matched to water over a broad bandwidth. In contrast to previous designs, the underlying lattice features refractive indices that are lower than the water background, which facilitates propagation control based on a phase advance as opposed to a delay. The index gradient is achieved by varying the filling fraction of hollow, air-filled aluminum tubes that individually exhibit a higher sound speed than water and matched impedance. Acoustic focusing is observed over a broad bandwidth of frequencies in the homogenization limit of the lattice, with intensity magnifications in excess of 7 dB. An anisotropic lattice design facilitates a flatfaceted geometry with low backscattering at 18 dB below the incident sound-pressure level. A threedimensional Rayleigh-Sommerfeld integration that accounts for the anisotropic refraction is used to accurately predict the experimentally measured focal patterns.

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Tapered labyrinthine acoustic metamaterials for broadband impedance matching

Cited by 158 publications

References 23 publications

Design for Additive Manufacturing: Trends, opportunities, considerations, and constraints

Design for Additive Manufacturing: Trends, opportunities, considerations, and constraints

Wavefront modulation and subwavelength diffractive acoustics with an acoustic metasurface

Transparent Gradient-Index Lens for Underwater Sound Based on Phase Advance

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