Demonstration of slow sound propagation and acoustic transparency with a series of detuned resonators

Santillan, Arturo Orozco; Bozhevolnyi, Sergey I.

doi:10.1103/physrevb.89.184301

Cited by 34 publications

(25 citation statements)

References 47 publications

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“…The second one is the effect of higher-order dispersion. Configurations like the one in [25] lead to narrow-band transmission and strong dispersion. Here, we focus on configurations where both the group index is high enough and the dispersioninduced pulse distortion is at a minimum.…”

Section: Slow Dispersion-free Sound Propagationmentioning

confidence: 99%

“…The peaks correspond to Fabry-Perot-like modes, and they can cause distortion to a propagating pulse and limit the bandwidths of the device. For the case of acoustic pulse propagation in finite, locally resonant periodic structures with HRs, one can refer to [25]. In that study, the authors consider the slow sound propagation of a narrow-band signal in a finite periodic structure composed of four detuned HRs.…”

Section: Finite Lossy Structuresmentioning

confidence: 99%

“…In addition, this work contributes to other applications of the field of slow sound, such as acoustic transparency [10,[22][23][24][25] and the acoustic rainbow effect [26]-fields that have experienced an increase in interest recently, following the trend in their optical and plasmonic counterparts (see, for example, [27,28] for slow light in optical structures and [29] for rainbow trapping effects in plasmonics). In optics, the study of slow light phenomena has increased due to potential applications in areas such as signal processing, sensing, and enhanced nonlinear effects (see [27,28] and references therein).…”

Section: Introductionmentioning

confidence: 99%

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Limits of slow sound propagation and transparency in lossy, locally resonant periodic structures

et al. 2014

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We investigate sound propagation in lossy, locally resonant periodic structures by studying an air-filled tube periodically loaded with Helmholtz resonators and taking into account the intrinsic viscothermal losses. In particular, by tuning the resonator with the Bragg gap in this prototypical locally resonant structure, we study the limits and various characteristics of slow sound propagation. While in the lossless case the overlapping of the gaps results in slow-sound-induced transparency of a narrow frequency band surrounded by a strong and broadband gap, the inclusion of the unavoidable losses imposes limits to the slowdown factor and the maximum transmission. Experiments, theory, and finite element simulations have been used for the characterization of acoustic wave propagation by tuning the Helmholtz/Bragg frequencies and the total amount of loss both for infinite and finite lattices. This study contributes to the field of locally resonant acoustic metamaterials and slow sound applications.

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Section: Slow Dispersion-free Sound Propagationmentioning

confidence: 99%

Section: Finite Lossy Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Limits of slow sound propagation and transparency in lossy, locally resonant periodic structures

et al. 2014

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“…12 As an analogy to the counterparts in electromagnetic and optical fields, [13][14][15] pairs of detuned Helmholtz resonators grafted along two sides of a tube were applied to slow down the transmission of sound. 16,17 Actually, sound transmission in a similar structure composed of a series of Helmholtz resonators located along a tube was previously explored, and it was observed that this a) Author to whom correspondence should be addressed. structure was effective in suppression of nonlinear shock waves in far fields.…”

Section: Introductionmentioning

confidence: 99%

Suppression of harmonics in a model of thermoacoustic refrigerator based on an acoustic metamaterial

Fan

Ding

Zhu

et al. 2015

The Journal of the Acoustical Society of America

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A model of thermoacoustic refrigerator on the basis of an acoustic metamaterial is presented, in which an array of side pipes is adopted to suppress harmonic waves in the thermoacoustic resonator. The array of side pipes traps the acoustic waves with Fabry-Perot resonant frequencies and induces narrow forbidden bands of transmission. When the resonant frequency of the thermoacoustic refrigerator is chosen as the operating frequency, the harmonic wave can be exactly located in the forbidden band by properly adapting the structural parameters of the system. Therefore, the component of the harmonic wave in the thermoacoustic resonator can be efficiently suppressed.

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“…At the opposite extreme, there are also interesting effects which arise as the effective acoustic wave speed approaches zero, which is referred to as slow sound, the analogue of slow light in optics. Previous demonstrations have utilized resonant effects using either sonic crystals or detuned resonators [9][10][11][12][13], resulting in slow sound that occurs over a relatively narrow bandwidth. An application of slow-sound propagation was recently proposed for the improved design of acoustic absorbers by Groby et al [14], in which slow sound in large slits filled with absorptive foam was used to significantly increase the low-frequency absorption in air.…”

Section: Introductionmentioning

confidence: 99%

Aerogel as a Soft Acoustic Metamaterial for Airborne Sound

et al. 2016

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Soft acoustic metamaterials utilizing mesoporous structures have been proposed recently as a means for tuning the overall effective properties of the metamaterial and providing better coupling to the surrounding air. In this paper, the use of silica aerogel is examined theoretically and experimentally as part of a compact soft acoustic metamaterial structure, which enables a wide range of exotic effective macroscopic properties to be demonstrated, including negative density, density near zero, and nonresonant broadband slow-sound propagation. Experimental data are obtained on the effective density and sound speed using an air-filled acoustic impedance tube for flexural metamaterial elements, which have been investigated previously only indirectly due to the large contrast in acoustic impedance compared to that of air. Experimental results are presented for silica aerogel arranged in parallel with either one or two acoustic ports and are in very good agreement with the theoretical model.

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Demonstration of slow sound propagation and acoustic transparency with a series of detuned resonators

Cited by 34 publications

References 47 publications

Limits of slow sound propagation and transparency in lossy, locally resonant periodic structures

Limits of slow sound propagation and transparency in lossy, locally resonant periodic structures

Suppression of harmonics in a model of thermoacoustic refrigerator based on an acoustic metamaterial

Aerogel as a Soft Acoustic Metamaterial for Airborne Sound

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