Introduction to Phononic Crystals and Acoustic Metamaterials

Deymier, Pierre A.

doi:10.1007/978-3-642-31232-8_1

Cited by 126 publications

(156 citation statements)

References 67 publications

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“…Recent theoretical and experimental efforts in the direction of acoustic metamaterials [77] combined with high level calculations of two-and three-dimensional phononic structures [78] bring closer the long-term aim of mimicking transformation optics with acoustic phonons, so to implement transformation acoustics [79]. Progress in metamaterials would allow the control of sound and heat focusing, and a myriad of related refractive phenomena, enabling broader and more effective use of coherent phonons, as discussed in Section 3.…”

Section: Phononic Metamaterials and Surface Scatteringmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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Abstract. Understanding and controlling vibrations in condensed matter is emerging as an essential necessity both at fundamental level and for the development of a broad variety of technological applications. Intelligent design of the band structure and transport properties of phonons at the nanoscale and of their interactions with electrons and photons impact the efficiency of nanoelectronic systems and thermoelectric materials, permit the exploration of quantum phenomena with micro-and nanoscale resonators, and provide new tools for spectroscopy and imaging. In this colloquium we assess the state of the art of nanophononics, describing the recent achievements and the open challenges in nanoscale heat transport, coherent phonon generation and exploitation, and in nano-and optomechanics. We also underline the links among the diverse communities involved in the study of nanoscale phonons, pointing out the common goals and opportunities.

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Section: Phononic Metamaterials and Surface Scatteringmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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“…Later, Liu et al 3 paved the way for the realization of acoustic metamaterials, through arrangements of locally resonant elements, that could be described as effective media with negative effective parameters, not found in natural materials. Since then, a plethora of exotic properties of acoustic metamaterials have been intensively exploited showing novel wave control phenomena; these include subwavelength focusing 4 , cloaking 5 , perfect absorption 6,7 and extraordinary transmission 8 among others 9 .…”

Section: Introductionmentioning

confidence: 99%

Bright and gap solitons in membrane-type acoustic metamaterials

et al. 2017

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We study analytically and numerically envelope solitons (bright and gap solitons) in a onedimensional, nonlinear acoustic metamaterial, composed of an air-filled waveguide periodically loaded by clamped elastic plates. Based on the transmission line approach, we derive a nonlinear dynamical lattice model which, in the continuum approximation, leads to a nonlinear, dispersive and dissipative wave equation. Applying the multiple scales perturbation method, we derive an effective lossy nonlinear Schrödinger equation and obtain analytical expressions for bright and gap solitons. We also perform direct numerical simulations to study the dissipation-induced dynamics of the bright and gap solitons. Numerical and analytical results, relying on the analytical approximations and perturbation theory for solions, are found to be in good agreement.

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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.…”

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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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Introduction to Phononic Crystals and Acoustic Metamaterials

Cited by 126 publications

References 67 publications

Nanophononics: state of the art and perspectives

Nanophononics: state of the art and perspectives

Bright and gap solitons in membrane-type acoustic metamaterials

Single-sensor multispeaker listening with acoustic metamaterials

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