Acoustic impurity shielding induced by a pair of metasurfaces respecting 
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 symmetry

Zhang, Haixiao; Zhang, Yiwei; Liu, Xiaoli; Bao, Yu; Zhao, Jinyu

doi:10.1103/physrevb.106.094101

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…Moreover, unidirectional transparency stemming from non-Hermitian acoustic systems can also be utilized to realize an acoustic directional cloak [104,110]. In a similar way, such unidirectional transparency can be utilized to suppress the scattering from impurity, realized by a design combing zero-index and PT -symmetry [111,169,170].…”

Section: Non-hermitian Acoustics In Waveguides (1d)mentioning

confidence: 99%

“…By leveraging loss modulations, non-Hermitian metasurfaces show not only asymmetric refraction with respect to the surface normal [175,177,178], but also with respect to the surface tangential (space above and below the metasurface) [179,180]. Moreover, transmission-type non-Hermitian metasurfaces show intriguing capabilities including, but not limited to reflection immunity (significantly enhanced transmission efficiency by suppressing the back scattering through impurity-embedded [181] or impedance-mismatched lossy [169] media) as well as negative refractions [160,182].…”

Section: Non-hermitian Acoustics In Metasurfaces (2d)mentioning

confidence: 99%

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Non-local and non-Hermitian acoustic metasurfaces

Wang,

Dong,

et al. 2023

Rep. Prog. Phys.

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Acoustic metasurfaces are at the frontier of acoustic functional material research owing to their advanced capabilities of wave manipulation at an acoustically vanishing size. Despite significant progress in the last decade, conventional acoustic metasurfaces are still fundamentally limited by their underlying physics and design principles. First, conventional metasurfaces assume that unit cells are decoupled and therefore treat them individually during the design process. Owing to diffraction, however, the non-locality of the wave field could strongly affect the efficiency and even alter the behavior of acoustic metasurfaces. Additionally, conventional acoustic metasurfaces operate by modulating the phase and are typically treated as lossless systems. Due to the narrow regions in acoustic metasurfaces' subwavelength unit cells, however, losses are naturally present and could compromise the performance of acoustic metasurfaces. While the conventional wisdom is to minimize these effects, a counter-intuitive way of thinking has emerged, which is to harness the non-locality as well as loss for enhanced acoustic metasurface functionality. This has led to a new generation of acoustic metasurface design paradigm that is empowered by non-locality and non-Hermicity, providing new routes for controlling sound using the acoustic version of 2D materials.This review details the progress of non-local and non-Hermitian acoustic metasurfaces, providing an overview of the recent acoustic metasurface designs and discussing the critical role of non-locality and loss in acoustic metasurfaces. We further outline the synergy between non-locality and non-Hermiticity, and delineate the potential of using non-local and non-Hermitian acoustic metasurfaces as a new platform for investigating exceptional points (EPs), the hallmark of non-Hermitian physics. Finally, the current challenges and future outlook for this burgeoning field are discussed.

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Section: Non-hermitian Acoustics In Waveguides (1d)mentioning

confidence: 99%

Section: Non-hermitian Acoustics In Metasurfaces (2d)mentioning

confidence: 99%

Non-local and non-Hermitian acoustic metasurfaces

Wang,

Dong,

et al. 2023

Rep. Prog. Phys.

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“…[13,[16][17][18][19][20]30] It is noteworthy that this type of asymmetric behavior corresponds to reflected waves and does not respond to transmitted waves, since the system still maintains its reciprocity. After the extension from optics to acoustics, the progress in designing and realizing PT -symmetric acoustic systems has resulted in many nontrivial asymmetric effects such as unidirectional sound wave-vector manipulation, [31][32][33][34][35] unidirectional invisibility, [2,[36][37][38] and asymmetric reflection and diffraction. [39][40][41][42][43][44] Negative refraction as a special wave behavior has been realized by acoustic metamaterials where the effective density (𝜌) and bulk modulus (𝐵) are simultaneously negative.…”

mentioning

confidence: 99%

Unidirectional Negative Refraction at an Exceptional Point of Acoustic PT-Symmetric Systems

Liu 刘,

Lan 蓝,

Gu 顾

et al. 2023

Chinese Phys. Lett.

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In this work, we demonstrate a method to realize the unidirectional negative refraction in an acoustic parity-time (PT)-symmetric system, which is composed of a pair of metasurfaces sandwiching an air gap. The pair of metasurfaces possesses loss and gain modulations, respectively. The unidirectional negative refraction, which is strictly limited to the case of incident wave imposing on the lossy end of the metasurface, is demonstrated at the exception point (EP) in this PT-symmetric system, while the incidence from the other side will lead to strong reflection. Based on the rigorous calculations, we explicitly show the underlying mechanism of this model to achieve unidirectional wave scatterings around the EP in the parametric space. In addition, the perfect imaging of a point source in the three-dimensional space, as a signature of negative refraction, is simulated to provide a verification of our work. We envision that this work may sharpen the understanding of PT-symmetric structures and inspire more acoustic functional devices.

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Rabi‐Like Splitting in Acoustic Cavity Coupled with Membrane‐Type Metasurface

Sun,

Fan,

Chen

et al. 2024

Adv Eng Mater

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Rabi‐like splitting effect in acoustics is demonstrated in a hybrid metasurface. The hybrid metasurface is composed of a membrane‐type acoustic metasurface and a Fabry‐Perot (F‐P) cavity. It is found that the transmission resonance of the F‐P cavity is modulated to spectrum with two peaks around the resonant frequencies. The transmission valley in the middle of the two transmission peaks caused by the anti‐resonance effect, the phenomenon is similar to the Rabi splitting effect in quantum physics. The results are promising for utilization in designing acoustic wave devices like filtering and acoustic sensors with new mechanisms in hybrid metasurfaces.This article is protected by copyright. All rights reserved.

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Acoustic impurity shielding induced by a pair of metasurfaces respecting PT symmetry

Cited by 6 publications

References 42 publications

Non-local and non-Hermitian acoustic metasurfaces

Non-local and non-Hermitian acoustic metasurfaces

Unidirectional Negative Refraction at an Exceptional Point of Acoustic PT-Symmetric Systems

Rabi‐Like Splitting in Acoustic Cavity Coupled with Membrane‐Type Metasurface

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