Theoretical requirements for broadband perfect absorption of acoustic waves by ultra-thin elastic meta-films

Duan, Yuetao; Luo, Jie; Wang, Guanghao; Hang, Zhi Hong; Hou, Bo; Li, Jensen; Sheng, Ping; Lai, Yun

doi:10.1038/srep12139

Cited by 67 publications

(35 citation statements)

References 50 publications

(87 reference statements)

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“…Such devices can totally absorb the energy of an incident wave and require solving the twofold but often contradictory problem: (i) increasing the density of states at low frequencies and (ii) matching the impedance with the background medium. On the one hand, the use of local resonators is a successful approach for increasing the density of states at low frequencies with reduced dimensions, as it has been shown in the field of metamaterials [6][7][8][9][10][11][12][13]. On the other hand, the local resonators of such metamaterials are open and lossy ones, implying energy leakage and inherent losses.…”

Section: Introductionmentioning

confidence: 99%

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Limits of flexural wave absorption by open lossy resonators: reflection and transmission problems

et al. 2019

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The limits of flexural wave absorption by open lossy resonators are analytically and numerically reported in this work for both the reflection and transmission problems. An experimental validation for the reflection problem is presented. The reflection and transmission of flexural waves in 1D resonant thin beams are analyzed by means of the transfer matrix method. The hypotheses, on which the analytical model relies, are validated by experimental results. The open lossy resonator, consisting of a finite length beam thinner than the main beam, presents both energy leakage due to the aperture of the resonators to the main beam and inherent losses due to the viscoelastic damping. Wave absorption is found to be limited by the balance between the energy leakage and the inherent losses of the open lossy resonator. The perfect compensation of these two elements is known as the critical coupling condition and can be easily tuned by the geometry of the resonator. On the one hand, the scattering in the reflection problem is represented by the reflection coefficient. A single symmetry of the resonance is used to obtain the critical coupling condition. Therefore the perfect absorption can be obtained in this case. On the other hand, the transmission problem is represented by two eigenvalues of the scattering matrix, representing the symmetric and anti-symmetric parts of the full scattering problem. In the geometry analyzed in this work, only one kind of symmetry can be critically coupled, and therefore, the maximal absorption in the transmission problem is limited to 0.5. The results shown in this work pave the way to the design of resonators for efficient flexural wave absorption.

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Section: Introductionmentioning

confidence: 99%

“…The critical coupling condition is also relevant for applications in vibrations owing to the increasing need for damping materials at low frequencies in several branches of industry [10]. Current passive solutions in this field are mainly based on the use of viscoelastic coatings [18].…”

Section: Introductionmentioning

confidence: 99%

Limits of flexural wave absorption by open lossy resonators: reflection and transmission problems

et al. 2019

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“…We also discuss emerging applications for CPAs in sensing and all-optical information processing. Although our emphasis is on classical optics, coherent perfect absorption is a general phenomenon arising from the interplay of interference and dissipation, and can therefore be realized in other interesting contexts, including acoustics [24][25][26][27], polaritonics [28], and quantum optics [29].…”

Section: Introductionmentioning

confidence: 99%

Coherent perfect absorbers: linear control of light with light

et al. 2017

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Absorption of electromagnetic energy by a material is a phenomenon that underlies many applied problems, including molecular sensing, photocurrent generation and photodetection. Commonly, the incident energy is delivered to the system through a single channel, for example by a plane wave incident on one side of an absorber. However, absorption can be made much more efficient by exploiting wave interference. A coherent perfect absorber is a system in which complete absorption of electromagnetic radiation is achieved by controlling the interference of multiple incident waves. Here, we review recent advances in the design and applications of such devices. We present the theoretical principles underlying the phenomenon of coherent perfect absorption and give an overview of the photonic structures in which it can be realized, including planar and guidedmode structures, graphene-based systems, parity-and time-symmetric structures, 3D structures and quantum-mechanical systems. We then discuss possible applications of coherent perfect absorption in nanophotonics and, finally, we survey the perspectives for the future of this field.

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“…Many researchers have expanded this method to acoustic waves, [16][17][18] matter waves, 19 and even surface water waves. 20,21 Inspired by this method, an omnidirectional absorber 22,23 (like black hole) was also designed, and experimentally validated through different procedures. 24 In other studies, 25 researchers also proposed the wave "black hole" by mimicking a real black hole's curved space times caused by gravitational fields.…”

Section: Introductionmentioning

confidence: 99%

A novel broadband waterborne acoustic absorber

Wang

Huang

et al. 2016

AIP Advances

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In this paper, we extended the ray tracing theory in polar coordinate system, and originally proposed the Snell–Descartes law in polar coordinates. Based on these theories, a novel broadband waterborne acoustic absorber device was proposed. This device is designed with gradient-distributing materials along radius, which makes the incidence acoustic wave ray warps. The echo reduction effects of this device were investigated by finite element analysis, and the numerical results show that the reflectivity of acoustic wave for the new device is lower than that of homogenous and Alberich layers in almost all frequency 0-30 kHz at the same loss factor.

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Theoretical requirements for broadband perfect absorption of acoustic waves by ultra-thin elastic meta-films

Cited by 67 publications

References 50 publications

Limits of flexural wave absorption by open lossy resonators: reflection and transmission problems

Limits of flexural wave absorption by open lossy resonators: reflection and transmission problems

Coherent perfect absorbers: linear control of light with light

A novel broadband waterborne acoustic absorber

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