Negative refraction of acoustic waves using a foam-like metallic structure

Hladky‐Hennion, Anne‐Christine; Vasseur, J. O.; Haw, G.; Croënne, Charles; Haumesser, Lionel; Norris, Andrew N.

doi:10.1063/1.4801642

Cited by 96 publications

(73 citation statements)

References 16 publications

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“…Negative refraction was also demonstrated in phononic crystals with a fluid (liquid or air) matrix surrounding solid inclusions [11,12] and recently using a foamlike metallic structure [13]. All of them are based on the negative slope of some high frequency bands in the dispersion relation.…”

Section: -2mentioning

confidence: 99%

Negative Refraction and Energy Funneling by Hyperbolic Materials: An Experimental Demonstration in Acoustics

2014

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Section: -2mentioning

confidence: 99%

Negative Refraction and Energy Funneling by Hyperbolic Materials: An Experimental Demonstration in Acoustics

2014

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“…Our metasurface is essentially a metamaterial/ phononic crystal hybrid structure 10 and both the local and non-local responses can be leveraged for the purpose of shaping the wavefront with a much larger degree of control than traditional acoustic wave manipulation methods. Such thin planar acoustic metasurfaces, along with existing bulk metamaterials [11][12][13][14][15][16][17][18][19][20] , provide a new design methodology for acoustic wave modulation, sensing and imaging applications.…”

mentioning

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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“…Acoustic metamaterials are a broad family of engineered materials which can be designed to possess flexible and unusual effective properties (12,13). In the past, acoustic metamaterials with high anisotropy (14,15), extreme nonlinearity (16), or negative dynamic parameters (density, bulk modulus, refractive index) (17)(18)(19)(20) have been realized. Applications such as scattering reducing sound cloak (21,22), beam steering metasurface (23), and other wave manipulating devices (24)(25)(26)(27) have been proposed and demonstrated.…”

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confidence: 99%

Single-sensor multispeaker listening with acoustic metamaterials

Xie

Tsai

Konneker

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Designing a "cocktail party listener" that functionally mimics the selective perception of a human auditory system has been pursued over the past decades. By exploiting acoustic metamaterials and compressive sensing, we present here a single-sensor listening device that separates simultaneous overlapping sounds from different sources. The device with a compact array of resonant metamaterials is demonstrated to distinguish three overlapping and independent sources with 96.67% correct audio recognition. Segregation of the audio signals is achieved using physical layer encoding without relying on source characteristics. This hardware approach to multichannel source separation can be applied to robust speech recognition and hearing aids and may be extended to other acoustic imaging and sensing applications. metamaterials | cocktail party problem | compressive sensing T he "cocktail party" or multispeaker listening problem is inspired by the remarkable ability of the human's auditory system in selectively attending to one speaker or audio signal in a multiple-speaker noisy environment (1, 2). Over the past half a century (3), the quest to understand the underlying mechanism (4-6) and build functionally similar devices has motivated significant research efforts (4-8).Previously proposed engineered multispeaker listening systems generally fall into two categories. The first kind is based on audio features and linguistic models of speech. For example, harmonic characteristics, temporal continuity, onset/offset of speech units combined with hidden Markov language models can be used to group overlapping audio signals into different sources (7, 9, 10). The drawback of such an approach is that certain audio characteristics have to be assumed (e.g., nonoverlapping in spectrogram) and linguistic model-based estimation can be very computationally intensive. The second kind relies on multisensor arrays to spatially filter sources (11). The need for multiple transducers and system complexity are the major disadvantages of the second approach.In this work, we demonstrate a multispeaker listening system that separates overlapping simultaneous conversations by leveraging the wave modulation capabilities of acoustic metamaterials. Acoustic metamaterials are a broad family of engineered materials which can be designed to possess flexible and unusual effective properties (12, 13). In the past, acoustic metamaterials with high anisotropy (14, 15), extreme nonlinearity (16), or negative dynamic parameters (density, bulk modulus, refractive index) (17-20) have been realized. Applications such as scattering reducing sound cloak (21, 22), beam steering metasurface (23), and other wave manipulating devices (24-27) have been proposed and demonstrated. We demonstrate here that acoustic metamaterials can also be useful for encoding independent acoustic signals coming from different spatial locations by creating highly frequency-dependent and spatially complex measurement modes (28), and aid the solution finding for the inverse problem. Such ph...

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Negative refraction of acoustic waves using a foam-like metallic structure

Cited by 96 publications

References 16 publications

Negative Refraction and Energy Funneling by Hyperbolic Materials: An Experimental Demonstration in Acoustics

Negative Refraction and Energy Funneling by Hyperbolic Materials: An Experimental Demonstration in Acoustics

Wavefront modulation and subwavelength diffractive acoustics with an acoustic metasurface

Single-sensor multispeaker listening with acoustic metamaterials

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