A unidirectional acoustic cloak for multilayered background media with homogeneous metamaterials

Zhu, Jiang; Chen, Tianning; Liang, Qingxuan; Wang, Xiaopeng; Xiong, Jie; Jiang, Ping

doi:10.1088/0022-3727/48/30/305502

Cited by 32 publications

(15 citation statements)

References 28 publications

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“…Alternatively, suspended thin membranes of poly(vinylidene fluoride) 13 or graphene 14 stretched over air cavities have been proposed as microphones to afford a higher sensitivity than PZT 15 , or to detect ultrasound from bats, but these configurations introduce even larger mismatch in acoustic impedance between the device (air) and water. Considering the advances in acoustic metamaterial cloaking 16 17 , which greatly attenuates incoming acoustic signals, thereby concealing submarine bodies from SONAR detection, a ceramic piezoelectric detector or cavity-based microphone, which is necessarily kept outside of this ‘invisibility cloak', remains a strong acoustic reflector.…”

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confidence: 99%

Hydrogel microphones for stealthy underwater listening

et al. 2016

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Exploring the abundant resources in the ocean requires underwater acoustic detectors with a high-sensitivity reception of low-frequency sound from greater distances and zero reflections. Here we address both challenges by integrating an easily deformable network of metal nanoparticles in a hydrogel matrix for use as a cavity-free microphone. Since metal nanoparticles can be densely implanted as inclusions, and can even be arranged in coherent arrays, this microphone can detect static loads and air breezes from different angles, as well as underwater acoustic signals from 20 Hz to 3 kHz at amplitudes as low as 4 Pa. Unlike dielectric capacitors or cavity-based microphones that respond to stimuli by deforming the device in thickness directions, this hydrogel device responds with a transient modulation of electric double layers, resulting in an extraordinary sensitivity (217 nF kPa−1 or 24 μC N−1 at a bias of 1.0 V) without using any signal amplification tools.

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confidence: 99%

Hydrogel microphones for stealthy underwater listening

et al. 2016

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“…Thus, it can be concluded that the designed carpet can cloak the scatter well at 15kHz. Moreover, the cosine similarity (CSI), which can be written as follows [21,43]:…”

Section: Simulation Resultsmentioning

confidence: 99%

Quasi-isotropic underwater acoustic carpet cloak based on latticed pentamode metafluid

Sun

Han

et al. 2019

Applied Physics Letters

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In this work, we present a practical design of quasi isotropic underwater acoustic carpet cloak with pentamode microstructure. The quasi conformal transformation is not only used to obtain the required parameters, but also used to deform the retrieved regular pentamode material structure to the desired carpet, during which the effective parameters can be considered as not being affected too much. The nice and broadband cloak effect shows the success of the design. This work will contribute to the experimental demonstration of pentamode acoustic carpet cloak. Moreover, the technique in this work also can be used to design arbitrarily shaped devices with microstructures.

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“…For example, in airborne acoustics, perforated plastic plates have been applied for 2D 29 and 3D 30 ground plane cloaks and for underwater acoustics, steal strips 31 and brass plates 32 have been proposed. In addition, acoustic unidirectional cloaks were implemented via composites of metals and porous materials for a multi-layered host medium 33 and meta-fluid structured by slab-shape units for air host 34 .…”

Section: Introductionmentioning

confidence: 99%

Non-closed acoustic cloaking devices enabled by sequential-step linear coordinate transformations

Basiri

Fakheri

Abdolali

et al. 2021

Sci Rep

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Hitherto acoustic cloaking devices, which conceal objects externally, depend on objects' characteristics. Despite previous works, we design cloaking devices placed adjacent to an arbitrary object and make it invisible without the need to make it enclosed. Applying sequential linear coordinate transformations leads to a non-closed acoustic cloak with homogeneous materials, creating an open invisible region. Firstly, we propose to design a non-closed carpet cloak to conceal objects on a reflecting plane. Numerical simulations verify the cloaking effect, which is completely independent of the geometry and material properties of the hidden object. Moreover, we extend this idea to achieve a directional acoustic cloak with homogeneous materials that can render arbitrary objects in free space invisible to incident radiation. To demonstrate the feasibility of the realization, a non-resonant meta-atom is utilized which dramatically facilitated the physical realization of our design. Due to the simple acoustic constitutive parameters of the presented structures, this work paves the way toward realization of non-closed acoustic devices, which could find applications in airborne sound manipulation and underwater demands.

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A unidirectional acoustic cloak for multilayered background media with homogeneous metamaterials

Cited by 32 publications

References 28 publications

Hydrogel microphones for stealthy underwater listening

Hydrogel microphones for stealthy underwater listening

Quasi-isotropic underwater acoustic carpet cloak based on latticed pentamode metafluid

Non-closed acoustic cloaking devices enabled by sequential-step linear coordinate transformations

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