Perfect Undetectable Acoustic Device from Fabry-Pérot Resonances

Chen, Huanyang; Zhou, Yangyang; Zhou, Mengying; Xu, Lin; Liu, Qing

doi:10.1103/physrevapplied.9.024014

Cited by 10 publications

(7 citation statements)

References 16 publications

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“…The Fabry-Pérot resonance [20][21] is a good candidate as it can maintain the phase constant while keeping perfect transmission.…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Omnidirectional Acoustic Illusion

Yin²,

Chen³

2022

Phys. Rev. Applied

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Acoustic waves are ubiquitous in human everyday experience, therefore, precise control over the deformation of acoustic waves is always extremely desirable, which can be used, for example, to transform or hide objects from incident waves. Acoustic illusion devices are generally implemented by transformation acoustics, which can deceive ears or sonar systems. Challenges remain, the complexed and extreme material parameters prescribed by coordinate transformation theory make the implementations particularly difficult, even with the help of acoustic metamaterials. Here, a novel method based on Fabry-Perot resonances offers a feasible solution for achieve three-dimensional (3D) omnidirectional passive acoustic illusion. We theoretically demonstrated perfect 3D acoustic illusion via Mie theory, reduced version is further designed numerically and implemented experimentally. In the future, our work opens new possibilities for the implementation of modern acoustic illusion devices, such as camouflage for anti-sonar detection.

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“…The Fabry-Pérot resonance [20][21] is a good candidate as it can maintain the phase constant while keeping perfect transmission.…”

Section: Introductionmentioning

confidence: 99%

“…Our approach requires neither the bulk metamaterials with negative indices nor ground, yet allows us to demonstrate a series of omnidirectional acoustic illusion effects. K and 0 ρ are the bulk modulus and density of the background [20]. Here, the inner and outer radii of the cloak are a and b, respectively.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Omnidirectional Acoustic Illusion

Yin²,

Chen³

2022

Phys. Rev. Applied

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“…In turn, different sophisticated sound manipulation effects may be expected from given PT -dipole arrangements; for instance, Fig. 1(b) is intended to archive strong concentrations of sound, which have also been proposed in the field of transformation optics/acoustics [23][24][25]. The last part of the work proposes oriented PTsymmetric HR dipole structures.…”

Section: Introductionmentioning

confidence: 99%

PT -symmetric Helmholtz resonator dipoles for sound directivity

et al. 2021

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Parity-time (PT )-symmetric or, more generally, non-Hermitian systems have opened a new area for unconventional management of waves, with significant applications, especially in optics. However, fewer proposals are found in acoustics, possibly due to the lack of a simple mechanism for coherent gain. In this paper, we propose a composite non-Hermitian system in acoustics consisting of assemblies of PT -symmetric Helmholtz resonator (HR) dipoles. Like meta-atoms are used as building elements in metamaterials, we propose PTsymmetric dipoles to design non-Hermitian systems intended to engineer complicated directivity fields. We theoretically analyze, numerically confirm, and experimentally show the symmetry breaking in a twodimensional space of non-Hermitian dipoles consisting of a pair of Helmholtz resonators with different levels of gain and loss. In particular, we explore, as an application, a metastructure to concentrate the sound pressure inside the circular array formed by PT -symmetric dipoles. The proposed HR dipoles may be a convenient composite element for smart control of sound.

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“…In the present paper, instead of manipulating acoustic signals in the frequency domain, we modify as little as possible the material parameters (mass density or bulk modulus) in the wave vector domain to change the acoustic scattering potential for acoustic illusions. There are also some other illusion and cloaking methods for acoustic waves, such as scattering cancellation [34][35][36] and Fabry-Pérot resonance [37]. A new way to artificially manipulate electromagnetic waves has been proposed in 2015 by using spatial Kramers-Kronig (KK) media [38], followed by some experimental demonstration [39,40] to show a perfect absorber.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Illusion Using Materials with Isotropic and Positive Parameters

Liu

2018

Phys. Rev. Applied

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Acoustic illusion devices are usually designed using transformation optics. In this article, a new method is proposed to achieve acoustic illusions without external devices by elaborately manipulating the acoustic scattering potential of an object. The proposed method in this article is more of a "cosmetic operation" for an object, which modifies the scattered acoustic pressure distribution of the object to mimic another object by exchanging their scattering potentials in two symmetrical areas in the wave vector domain. The advantage of this method is the simplicity of material parameters: only positive isotropic mass density and bulk modulus are required, which is impossible in the conventional method of using transformation optics due to the complex material requirements (anisotropic and negative index parameters).

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Perfect Undetectable Acoustic Device from Fabry-Pérot Resonances

Cited by 10 publications

References 16 publications

Three-Dimensional Omnidirectional Acoustic Illusion

Three-Dimensional Omnidirectional Acoustic Illusion

PT -symmetric Helmholtz resonator dipoles for sound directivity

Acoustic Illusion Using Materials with Isotropic and Positive Parameters

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