Non-Hermitian metagrating for perfect absorption of elastic waves

Cheng, Jiali; Hu, Yabin; Li, Bing

doi:10.1039/d3mh01866k

Cited by 3 publications

(3 citation statements)

References 45 publications

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“…In stark contrast to the prevailing research paradigm rooted in Hermitian physics, a recent work embarks on an exploration of the uncharted territory of non-Hermitian elastic metamaterials, thus ushering in new frontiers within open quantum and classical systems characterized by gain or loss. As Figure 9(a) shows (Cheng et al, 2024), this paradigm shift hinges on the introduction of non-Hermitian modulation, as embodied by the creation of the non-Hermitian metagrating (NHMG). The NHMG, characterized by its single type of subwavelength unit cell, exhibits remarkable characteristics under specific low-loss conditions, epitomizing the realization of perfect wave absorption (Figure 9(b)) and culminating in the establishment of a versatile design framework for NHMG materials, accommodating irregular and arbitrary shapes.…”

Section: Non-hermitian Elastic Metasurfacesmentioning

confidence: 99%

“…The structure of this elastic metasurface is shown in Figure 9(e) (Stojanoska and Shen, 2022). The non-Hermitian degree can (Cheng et al, 2024). (e) Schematic of the piezoelectric non-Hermitian metasurface.…”

Section: Non-hermitian Elastic Metasurfacesmentioning

confidence: 99%

“…(c) The energy field distributions corresponding to NPU-shaped defects. (d) Experimental setup and experimental model(Cheng et al, 2024). (e) Schematic of the piezoelectric non-Hermitian metasurface.…”

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confidence: 99%

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Perspectives for extraordinary elastic-wave control in non-Hermitian meta-structures

Ren,

Hu,

et al. 2024

Program. mater.

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Meta-structures, including metamaterials and metasurfaces, possess remarkable physical properties beyond those observed in natural materials and thus have exhibited unique wave manipulation abilities ranging from quantum to classical transports. The past decades have witnessed the explosive development and numerous implications of meta-structures in elastic-wave control under the Hermitian condition. However, more notably, a lot of recent research has been made to show that non-Hermitian meta-structures offer novel means for wave manipulation. Non-Hermiticity has enhanced both the accuracy and efficiency of wave steering capabilities. To this end, starting from electromagnetics and acoustics, we mainly review the up-to-date progress of non-Hermitian elastic meta-structures with a focus on their extraordinary elastic-wave control. A variety of promising scenarios realized by non-Hermitian elastic metamaterials and metasurfaces, such as the parity-time-symmetric system and the skin effect, are summarized. Furthermore, the perspectives and challenges of non-Hermitian elastic meta-structures for future key opportunities are outlined.

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Section: Non-hermitian Elastic Metasurfacesmentioning

confidence: 99%

Section: Non-hermitian Elastic Metasurfacesmentioning

confidence: 99%

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Perspectives for extraordinary elastic-wave control in non-Hermitian meta-structures

Ren,

Hu,

et al. 2024

Program. mater.

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Anomalous wavefront control of Lamb wave with metasurfaces via superposed prism resonance

Guan,

Zhou,

Wang

et al. 2024

Mechanics of Advanced Materials and Structures

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Refraction of flexural wave in the valley topological interface

Sheng,

Zhou

2024

Phys. Scr.

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The transport behavior of valley kink states has attracted significant research interest due to its potential prospects in energy harvesting vibration mitigation and elastic wave imaging In this work we extensively investigate the topological refraction in valley elastic topological insulators (TIs) when the topological edge states (TES) transport from the interface termination into the bare plate We show that the refraction pattern (negative or positive refraction) depends on the type of valleys from which the edge state is projected and the refraction angles can be tuned by the Dirac frequency Thus we can realize the conversion of the refracted wave into the evanescent wave resulting in no refraction beams in the bare plate which provides a new perspective for vibration isolation and mitigation We then construct a new layered TI by alternately arranging two unit cells with opposite topological phases The dispersion relation of the layered TI shows a negative band and a positive band in the bulk band gap corresponding to two different edge modes In the edge states the wave energy would transfer toward the negative (positive) direction of the wave vector along the interface when an incident wave couples to this TI resulting in a negative (positive) shift parallel to the interface We selectively achieve negative (positive) refraction by exciting only one desired edge mode In particular the presence of the impedance mismatch between the layered TIs and the bare plate leads to the relatively low energy amplitude of the refracted beam Our research results provide new insights into manipulating the refraction wave in plates and facilitate potential applications in vibration mitigation beam splitting and negative refraction images

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Non-Hermitian metagrating for perfect absorption of elastic waves

Abstract: Beyond the fashion of Hermitian physics, non-Hermiticity has inspired, most recently, a surge of nontrivial principles and significant applications in both open quantum and classical systems with gain or loss....

Cited by 3 publications

References 45 publications

Perspectives for extraordinary elastic-wave control in non-Hermitian meta-structures

Perspectives for extraordinary elastic-wave control in non-Hermitian meta-structures

Anomalous wavefront control of Lamb wave with metasurfaces via superposed prism resonance

Refraction of flexural wave in the valley topological interface

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