Nonlocal active metamaterial with feedback control for tunable bandgap and broadband nonreciprocity

Gao, Yuqiang; Wang, Lifeng

doi:10.1016/j.ijmecsci.2022.107131

Cited by 15 publications

(5 citation statements)

References 59 publications

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“…In this perspective, starting from electromagnetics and acoustics, we mainly focused on the up-to-date progress of non-Hermitian elastic meta-structures with a review of their extraordinary elastic-wave manipulations. The corresponding studies also highlighted this crucial component of non-Hermitian modulation, such as the phase break of PT-symmetric (Fang et al, 2021a;Cao et al, 2022), non-reciprocal feedback (Lau and Clerk, 2018;Clerk, 2022;Gao and Wang, 2022), etc. Furthermore, non-Hermitian elastic metastructures offer an ideal platform for the exploration of innovative wave phenomena within the domains of disorder, nonlinearity, and active control.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, hybrid couplings between phase-broken PT-symmetric structures, non-local feedback mechanisms, and the utilization of high-order diffraction hold significant promise Figure 14. Vision for non-Hermitian system in elastic waves (Fu and Xu, 2017;Nunes et al, 2017;Lau and Clerk, 2018;Gao and Wang, 2022;Gu et al, 2022;Liu et al, 2022;Zhang et al, 2023).…”

Section: Discussionmentioning

confidence: 99%

“…More spectacularly, an increasing number of researchers find that the investigations into skin effects have wider relevance for elastic-wave control in meta-structures. Thus, several works (Scheibner et al, 2020;Gao and Wang, 2022;Zhou et al, 2023) have started to explore a wealth of strategies for the coupling between the skin effect and meta-structures and suggest potential possibilities for specific applications.…”

Section: Skin Effect Of Non-hermitian System With Elastic-wave Modula...mentioning

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: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Skin Effect Of Non-hermitian System With Elastic-wave Modula...mentioning

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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“…By employing the sensing-actuation strategy, it becomes feasible to design active intelligent MMs capable of achieving more peculiar wave phenomena. Indeed, researchers have conducted experiments to demonstrate the ability of intelligent MMs equipped with digital circuits to realize wave directionality, [82] wave localization, [141] unidirectional non-reciprocal wave blocking, [142] cavity cloaking through the programming of MM cell arrays, [143] and controllable amplitude and phase of reflected and transmitted waves in a Willis meta-layer. [144]…”

Section: The Second Category Of Active Piezoelectric Mmsmentioning

confidence: 99%

Wave Manipulation in Intelligent Metamaterials: Recent Progress and Prospects

Wu,

Jiang,

Jiang

et al. 2024

Adv Funct Materials

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Metamaterials (MMs), which include phononic crystals (PCs) as a particular type, exhibit anomalous wave propagation properties through artificial design of topologies or lattice forms of unit‐cells. Recent advancements in MMs signify an ascendant research trend, providing promising design ideas and means for unprecedented wave propagation properties. The imperative for on‐demand, real‐time active control of wave propagation underscores the significance of tunable manipulation of acoustic/elastic waves, promoting the design and development of tunable MMs. Furthermore, the versatility of intelligent materials and their ongoing development and innovation contribute significantly to the emergence of diverse intelligent MMs. This comprehensive survey provides an overview of recent advancements and current research trends in the interdisciplinary field of intelligent MMs with electro‐/magneto‐mechanical couplings. The primary objective of the review is to emphasize significant progress in agile manipulation of acoustic/elastic waves in electro‐/magneto‐mechanical coupled MMs, followed by an in‐depth exploration of intelligent metasurfaces, topological MMs, non‐Hermitian parity‐time symmetric wave systems, odd elastic MMs, and spatiotemporally modulated MMs. Special emphasis is given to multi‐field coupling effects. The review concludes with a summary and outlines potential prospects, offering a timely and informative guide for future studies on actively tunable PCs and MMs in practical engineering applications.

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“…Hence, the control and attenuation of mechanical vibrations have always been of primary importance, especially, in structural engineering. For instance, base-isolation techniques [4][5] as well as passive [6][7], active [8][9], and semi-active [10][11] solutions have widely been used to mitigate excessive vibrations. Recent developments in this direction imply the use of metamaterialsartificially generated arrays of precisely engineered unit cells allowing to manipulation of the overall mechanical properties by changing the unit cell design [12][13].…”

Section: Introductionmentioning

confidence: 99%

Widely tunable magnetorheological metamaterials with nonlinear amplification mechanism

Xue,

Li,

Wang

et al. 2024

International Journal of Mechanical Sciences

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Nonlocal active metamaterial with feedback control for tunable bandgap and broadband nonreciprocity

Cited by 15 publications

References 59 publications

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

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

Wave Manipulation in Intelligent Metamaterials: Recent Progress and Prospects

Widely tunable magnetorheological metamaterials with nonlinear amplification mechanism

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