Controlling sound with acoustic metamaterials

Cummer, Steven A.; Christensen, Johan; Alù, Andrea

doi:10.1038/natrevmats.2016.1

Cited by 1,573 publications

(850 citation statements)

References 148 publications

Supporting

Mentioning

779

Contrasting

Unclassified

Order By: Relevance

“…In the dynamic case, they are well known by now. Examples are the magnetic permeability [3][4][5], the refractive index [4,6,7], the mechanical compressibility [8,9], the mass density [10][11][12], or both of the latter [13][14][15][16]. In all of these examples, the sign inversion arises from some sort of internal resonance.…”

mentioning

confidence: 99%

Experimental Evidence for Sign Reversal of the Hall Coefficient in Three-Dimensional Metamaterials

2017

View full text Add to dashboard Cite

Effectively inverting the sign of material parameters is a striking possibility arising from the concept of metamaterials. Here, we show that the electrical properties of a p-type semiconductor can be mimicked by a metamaterial solely made of an n-type semiconductor. By fabricating and characterizing threedimensional simple-cubic microlattices composed of interlocked hollow semiconducting tori, we demonstrate that sign and magnitude of the effective metamaterial Hall coefficient can be adjusted via a tori separation parameter-in agreement with previous theoretical and numerical predictions.

show abstract

mentioning

confidence: 99%

Experimental Evidence for Sign Reversal of the Hall Coefficient in Three-Dimensional Metamaterials

2017

View full text Add to dashboard Cite

show abstract

“…To this extent, the realization of a coherently tunable and periodically modulated acoustic response may turn out to be an attractive prospect for acoustic metamaterials [75][76][77][78][79].…”

Section: -7mentioning

confidence: 99%

Perfect absorption and no reflection in disordered photonic crystals

Artoni

Rocca

2017

Phys. Rev. A

View full text Add to dashboard Cite

Understanding the effects of disorder on the light propagation in photonic devices is of major importance from both fundamental and applied points of view. Unidirectional reflectionless and coherent perfect absorption of optical signals are unusual yet fascinating phenomena that have recently sparked an extensive research effort in photonics. These two phenomena, which arise from topological deformations of the scattering matrix S parameters space, behave differently in the presence of different types of disorder, as we show here for a lossy photonic crystal prototype with a parity-time antisymmetric susceptibility or a more general non-Hermitian one.

show abstract

“…Resonators can be formed from bubbles that show Minnaert resonances [20,21], low-density particles exploiting low-frequency acoustic Mie resonances [16], or thin films in liquid foams [19]. The study of metamaterials revealed acoustic properties desirable in acoustic applications [22,23]. For example, negative-refractive-index materials have been proposed to create lenses for subwavelength imaging [24][25][26][27], and acoustic rectification has been suggested to improve acoustic detection [28].…”

Section: Introductionmentioning

confidence: 99%

“…For example, negative-refractive-index materials have been proposed to create lenses for subwavelength imaging [24][25][26][27], and acoustic rectification has been suggested to improve acoustic detection [28]. However, many metamaterials have been presented as proof-of-principle demonstrations on macroscopic scales [22,23,27] creating the need for microscale tailorable solutions that can function in the megahertz-frequency regime, of interest to biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

Microlattice Metamaterials for Tailoring Ultrasonic Transmission with Elastoacoustic Hybridization

Krödel¹,

Daraio²

2016

Phys. Rev. Applied

View full text Add to dashboard Cite

Materials with designed microscale architectures, like microlattices, can achieve extreme mechanical properties. Most studies of microlattices focus on their quasistatic response, but their structural dimensions naturally prime them for ultrasonic applications. Here we report that microlattices constitute a class of acoustic metamaterials that exploit elastoacoustic hybridization to tailor ultrasonic wave propagation. Selecting the microlattice geometry allows the formation of hybridization band gaps that effectively attenuate (by >2 orders of magnitude) acoustic signals. The hybridization gaps stem from the interaction of pressure waves in a surrounding medium (e.g., water) with localized bending modes of the trusses in the microlattice. Outside these band gaps, the microlattices are highly transmissive (>80%) because their acoustic impedance is close to that of water. Our work can have important implications in the design of acoustic metamaterial applications in biomedical imaging, cell-based assay technology, and acoustic isolators in microelectromechanical systems.

show abstract

Controlling sound with acoustic metamaterials

Cited by 1,573 publications

References 148 publications

Experimental Evidence for Sign Reversal of the Hall Coefficient in Three-Dimensional Metamaterials

Experimental Evidence for Sign Reversal of the Hall Coefficient in Three-Dimensional Metamaterials

Perfect absorption and no reflection in disordered photonic crystals

Microlattice Metamaterials for Tailoring Ultrasonic Transmission with Elastoacoustic Hybridization

Contact Info

Product

Resources

About