Bioinspired Conformal Transformation Acoustics

Dong, Erqian; Zhou, Yangyang; Chen, Huanyang

doi:10.1103/physrevapplied.13.024002

Cited by 11 publications

(8 citation statements)

References 35 publications

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“…The developed steering and collimation models comprise three structures, namely, an air cavity for air sac biomimicking, a gradient-index distribution metamaterial for forehead tissue biomimicking and steel for skull biomimicking. Further numerical simulation and experimental verification were accomplished on the forehead shape deformations and corresponding control of the acoustic beam [ 45 ]. Applications have been evaluated for underwater target detection and ranging.…”

Section: Underwater Beam Formationmentioning

confidence: 99%

“…Cloaking is a most representative example of hiding objects or opening a virtual hole in a wall, including invisibility cloaking [ 42 , 43 ] and carpet cloaking [ 44 ]. To achieve underwater beam shift and target detection, underwater conformal transformation acoustics [ 45 ] have been proposed. On the basis of the transformation acoustics, a kind of complementary metamaterial [ 46 ] has been proposed for penetrating aberration layers in biomedical imaging applications.…”

Section: Introductionmentioning

confidence: 99%

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Underwater acoustic metamaterials

Dong

Cao

Zhang

et al. 2022

National Science Review

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Acoustic metamaterials have been widely investigated over the past few decades and have realized acoustic parameters that are not achievable using conventional materials. After demonstrating that locally resonant acoustic metamaterials are capable of acting as subwavelength unit cells, researchers have evaluated the possibility of breaking the classical limitations of the material mass density and bulk modulus. Combined with theoretical analysis, additive manufacturing, and engineering applications, acoustic metamaterials have demonstrated extraordinary capabilities including negative refraction, cloaking, beam formation, and super-resolution imaging. Owing to the complexity of impedance boundaries and mode transitions, there are still challenges in freely manipulating acoustic propagation in an underwater environment. This review summarizes the developments in underwater acoustic metamaterials over the past 20 years, which include underwater acoustic invisibility cloaking, underwater beam formation, underwater metasurfaces and phase engineering, underwater topological acoustics, and underwater acoustic metamaterial absorbers. With the evolution of underwater metamaterials and the timeline of scientific advances, underwater acoustic metamaterials have demonstrated exciting applications in underwater resource development, target recognition, imaging, noise reduction, navigation, and communication.

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Section: Underwater Beam Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Underwater acoustic metamaterials

Dong

Cao

Zhang

et al. 2022

National Science Review

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“…In addition, a recent research on dolphins’ tissue for echolocation with gradient bulk modulus has been revealed as transformation metamaterials. [ 179 ] Hence, TA might even give a new perspective in bioinspired materials. Like the above sections, it is also highly anticipated if anisotropic density could be achieved by natural materials with current fabrication technology.…”

Section: Experiments Of Transformation Wave Dynamicsmentioning

confidence: 99%

Transformation Metamaterials

Chen

2021

Advanced Materials

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Based on the form‐invariance of Maxwell's equations under coordinate transformations, mathematically smooth deformation of space can be physically equivalent to inhomogeneous and anisotropic electromagnetic (EM) medium (called a transformation medium). It provides a geometric recipe to control EM waves at will. A series of examples of achieving transformation media by artificially structured units from conventional materials is summarized here. Such concepts are firstly implemented for EM waves, and then extended to other wave dynamics, such as elastic waves, acoustic waves, surface water waves, and even stationary fields. These shall be cataloged as transformation metamaterials. In addition, it might be conceptually attractive and practically useful to control diverse waves for multi‐physics designs.

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“…Furthermore, the thickness L of MAS is less than wavelength, differing from previous acoustic switching arrays based on Bragg scattering [21][22][23][24]. We compare the on and off performance of MAS with that of the Bragg scattering structure, as shown in Fig.…”

Section: (A)mentioning

confidence: 99%

Switching Acoustic Propagation via Underwater Metasurface

Cao

Zhang

et al. 2020

Phys. Rev. Applied

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Switching on and off acoustic waves through metamaterials has potential in noise canceling, underwater detection, and communication. However, traditional acoustic designs are challenging in manipulating underwater acoustic waves when the device thickness is less than wavelength. Here we report an alternative design of an underwater metasurface-based acoustic switcher to achieve this goal. The switching mechanism is revealed by combing acoustic diffraction of grating with mode conversion of double-layer PMMA plates. The device is tuned to control wave transmission by changing grating angle. Furthermore, we experimentally fabricate the metasurface acoustic switcher. The broadband-switching performance is realized to control underwater target detection and to produce binary digital encoding for acoustic waves. The proposed metasurface acoustic switcher offers the advantages of broadband performance and thin structure, which promises the opportunity for designing next-generation broadband-switching devices in underwater acoustic detection and communication.

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Bioinspired Conformal Transformation Acoustics

Cited by 11 publications

References 35 publications

Underwater acoustic metamaterials

Underwater acoustic metamaterials

Transformation Metamaterials

Switching Acoustic Propagation via Underwater Metasurface

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