Doping of a plate-type acoustic metamaterial

Malléjac, Matthieu; Merkel, Aurélien; Tournat, Vincent; Groby, J.-P.; Romero‐García, Vicente

doi:10.1103/physrevb.102.060302

Cited by 11 publications

(9 citation statements)

References 37 publications

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“…In the second configuration, the viscoelasticy of the plates limits the doping efficiency as already observed in Ref. 41. As a result, the presence of the system in the waveguide induces a scattering (non-zero reflection).…”

Section: B Lossy Systemmentioning

confidence: 70%

“…42 In the case of doping, even if the efficiency is also limited by the losses, an enhanced transmission at the zero-phase frequency is reported in Ref. 41. The impact of losses on the effectiveness of cloaking for the two strategies considered is studied here.…”

Section: Introductionmentioning

confidence: 88%

“…The doping condition is reached when the effective density and the effective compressibility are simultaneously equal to zero. 41,45,46 A Helmholtz resonator (cavity length L c , cavity radius R c ¼ 1 cm, neck length L n ¼ 2 cm, and neck radius R n ¼ 2 mm) is mounted on the main waveguide, between the first two plates.…”

Section: Journal Of Applied Physicsmentioning

confidence: 99%

“…While cloaking seems to occur in lossless PAMs, we now consider the case of a realistic system, with the impact of losses, the role of which has been previously shown to be crucial in zero-index metamaterials. 39,41,47 Figures 3(c) and 3(d) show the effect of total losses (viscoelasticity of the plates and viscothermal losses) on the effectiveness of the two cloaking strategies. The viscothermal losses are accounted for by the complex, frequency-dependent wave number and impedance 44 in the air-filled cavities (waveguide of radius R a , diaphragm of radius R d , and neck of radius R n and cavities of radius R c of the Helmholtz resonator).…”

Section: B Lossy Systemmentioning

confidence: 99%

“…Yet, a perfect cloak based on this approach requires both full transmission and zero-phase propagation, which can be fulfilled by acoustic doping, i.e., the acoustic analog of photonic doping. 41 The embedding of a single well-designed impurity in a membrane-type or plate-type acoustic metamaterial (PAM) can transform the DNZ medium into DCNZ (Density and Compressibility Near Zero), thus conciliating the static like field distribution and the impedance matching condition, and leading to a full non-delayed transmission in the lossless case.…”

Section: Introductionmentioning

confidence: 99%

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Experimental evidence of a hiding zone in a density-near-zero acoustic metamaterial

Malléjac

Merkel

Sánchez‐Dehesa

et al. 2021

Journal of Applied Physics

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This paper examines the feasibility of cloaking an obstacle using Plate-type Acoustic Metamaterials (PAMs). We present two distinct strategies to cloak this obstacle, using either the near-zero-density regime of a periodic arrangement of plates or the acoustic doping phenomenon to achieve simultaneous zero-phase propagation and impedance matching. The strong limitations induced by viscothermal and viscoelastic losses that cannot be avoided in such a system are studied. A hiding zone is reported analytically, numerically, and experimentally. In contrast to cloaking, where zero-phase propagation must be accompanied by total transmission and zero reflection, the hiding configuration requires that the scattering properties of the hiding device must not be affected by the presence of the obstacle embedded in it. Contrary to cloaking, the hiding phenomenon is achievable even with a realistic PAM possessing unavoidable losses.

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Section: B Lossy Systemmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 88%

Section: Journal Of Applied Physicsmentioning

confidence: 99%

Section: B Lossy Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental evidence of a hiding zone in a density-near-zero acoustic metamaterial

Malléjac

Merkel

Sánchez‐Dehesa

et al. 2021

Journal of Applied Physics

Self Cite

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Wave Manipulation in Intelligent Metamaterials: Recent Progress and Prospects

Wu,

Jiang,

Jiang

et al. 2024

Adv Funct Materials

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Metamaterials (MMs), which include phononic crystals (PCs) as a particular type, exhibit anomalous wave propagation properties through artificial design of topologies or lattice forms of unit‐cells. Recent advancements in MMs signify an ascendant research trend, providing promising design ideas and means for unprecedented wave propagation properties. The imperative for on‐demand, real‐time active control of wave propagation underscores the significance of tunable manipulation of acoustic/elastic waves, promoting the design and development of tunable MMs. Furthermore, the versatility of intelligent materials and their ongoing development and innovation contribute significantly to the emergence of diverse intelligent MMs. This comprehensive survey provides an overview of recent advancements and current research trends in the interdisciplinary field of intelligent MMs with electro‐/magneto‐mechanical couplings. The primary objective of the review is to emphasize significant progress in agile manipulation of acoustic/elastic waves in electro‐/magneto‐mechanical coupled MMs, followed by an in‐depth exploration of intelligent metasurfaces, topological MMs, non‐Hermitian parity‐time symmetric wave systems, odd elastic MMs, and spatiotemporally modulated MMs. Special emphasis is given to multi‐field coupling effects. The review concludes with a summary and outlines potential prospects, offering a timely and informative guide for future studies on actively tunable PCs and MMs in practical engineering applications.

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