Efficient nonreciprocal mode transitions in spatiotemporally modulated acoustic metamaterials DOI Creative Commons
Zhaoxian Chen, Yu‐Gui Peng, Haoxiang Li

et al.

Science Advances, Journal Year: 2021, Volume and Issue: 7(45)

Published: Nov. 3, 2021

In linear, lossless, time-invariant, and nonbiased acoustic systems, mode transitions are time reversible, consistent with Lorentz reciprocity implying a strict symmetry in space-time for sound manipulation. Here, we overcome this fundamental limitation by implementing spatiotemporally modulated metamaterials that support nonreciprocal steering. Our mechanism relies on the coupling between an ultrathin membrane external biasing electromagnetic fields, realizing programmable dynamic control of impedance over motionless noiseless platform. The fast flexible modulation our metamaterial imparts effective unidirectional momentum to realize k-ω space different diffraction modes. On basis these principles, demonstrate efficient steering, showcasing evanescent wave conversion upconversion focusing. More generally, platform offers opportunities generation Bloch waves extension other domains, such as non-Hermitian topological parity-time symmetric acoustics.

Language: Английский

Non-reciprocal phase transitions DOI

Michel Fruchart,

Ryo Hanai, P. B. Littlewood

et al.

Nature, Journal Year: 2021, Volume and Issue: 592(7854), P. 363 - 369

Published: April 14, 2021

Language: Английский

Citations

395

Interfacial thermal resistance: Past, present, and future DOI
Jie Chen, Xiangfan Xu, Jun Zhou

et al.

Reviews of Modern Physics, Journal Year: 2022, Volume and Issue: 94(2)

Published: April 22, 2022

As devices and circuits scale to ever smaller sizes thermal management in them becomes more important, heat transport across their interfaces plays a crucial role development. While the study of interfacial resistance goes back almost 90 years, its increasing importance has led significant recent progress theory, experiment, simulation. This review chronicles this for solid-solid, solid-liquid, solid-gas interfaces, discusses how tailor minimize resistance, mentions some remaining challenges.

Language: Английский

Citations

364

Topological acoustics DOI
Haoran Xue, Yihao Yang, Baile Zhang

et al.

Nature Reviews Materials, Journal Year: 2022, Volume and Issue: 7(12), P. 974 - 990

Published: Aug. 23, 2022

Language: Английский

Citations

271

Topological active matter DOI
Suraj Shankar, Anton Souslov, Mark J. Bowick

et al.

Nature Reviews Physics, Journal Year: 2022, Volume and Issue: 4(6), P. 380 - 398

Published: May 6, 2022

Language: Английский

Citations

258

Non-Hermitian morphing of topological modes DOI
Wei Wang, Xulong Wang, Guancong Ma

et al.

Nature, Journal Year: 2022, Volume and Issue: 608(7921), P. 50 - 55

Published: Aug. 3, 2022

Language: Английский

Citations

166

Odd Viscosity and Odd Elasticity DOI Creative Commons

Michel Fruchart,

Colin Scheibner, Vincenzo Vitelli

et al.

Annual Review of Condensed Matter Physics, Journal Year: 2023, Volume and Issue: 14(1), P. 471 - 510

Published: March 10, 2023

Elasticity typically refers to a material's ability store energy, while viscosity tendency dissipate it. In this review, we discuss fluids and solids for which is not the case. These materials display additional linear response coefficients known as odd elasticity. We first introduce elasticity from continuum perspective, with an emphasis on their rich phenomenology, including transverse responses, modified dislocation dynamics, topological waves. then provide overview of systems that range quantum fluids, astrophysical gasses, active driven matter. Finally, comment microscopic mechanisms by arise.

Language: Английский

Citations

134

Physics of surface vibrational resonances: pillared phononic crystals, metamaterials, and metasurfaces DOI
Yabin Jin, Yan Pennec, Bernard Bonello

et al.

Reports on Progress in Physics, Journal Year: 2021, Volume and Issue: 84(8), P. 086502 - 086502

Published: Jan. 14, 2021

The introduction of engineered resonance phenomena on surfaces has opened a new frontier in surface science and technology. Pillared phononic crystals, metamaterials, metasurfaces are an emerging class artificial structured media, featuring that consist pillars—or branching substructures—standing plate or substrate. A pillared crystal exhibits Bragg band gaps, while metamaterial may feature both gaps local hybridization gaps. These two band-gap phenomena, along with other unique wave dispersion characteristics, have been exploited for variety applications spanning range length scales covering multiple disciplines applied physics engineering, particularly elastodynamics acoustics. intrinsic placement pillars semi-infinite surface—yielding metasurface—has similarly provided avenues the control manipulation propagation. Classical waves admitted including Lamb plates Rayleigh Love substrates, ranging frequency from hertz to several gigahertz. With presence pillars, these couple resonances richly creating properties subwavelength regime some at higher frequencies as well. At nanoscale, it was shown atomic-scale resonances—stemming nanopillars—alter fundamental nature conductive thermal transport by reducing group velocities generating mode localizations across entire spectrum constituent material well into terahertz regime. In this article, we first overview history development materials, then provide detailed synopsis selection key research topics involve utilization similar substructures different contexts. Finally, conclude providing short summary perspectives state field its promise further future development.

Language: Английский

Citations

133

From Photonic Crystals to Seismic Metamaterials: A Review via Phononic Crystals and Acoustic Metamaterials DOI

Muhammad Gulzari,

C.W. Lim

Archives of Computational Methods in Engineering, Journal Year: 2021, Volume and Issue: 29(2), P. 1137 - 1198

Published: June 15, 2021

Language: Английский

Citations

132

Realization of active metamaterials with odd micropolar elasticity DOI Creative Commons
Yangyang Chen, Xiaopeng Li, Colin Scheibner

et al.

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: Oct. 12, 2021

Materials made from active, living, or robotic components can display emergent properties arising local sensing and computation. Here, we realize a freestanding active metabeam with piezoelectric elements electronic feed-forward control that gives rise to an odd micropolar elasticity absent in energy-conserving media. The non-reciprocal modulus enables bending shearing cycles convert electrical energy into mechanical work, vice versa. sign of this elastic is linked non-Hermitian topological index determines the localization vibrational modes sample boundaries. At finite frequency, also tune phase angle produce direction-dependent properties. Our continuum approach, built on symmetries conservation laws, could be exploited design others systems such as synthetic biofilaments membranes loops.

Language: Английский

Citations

106

Achromatic metasurfaces by dispersion customization for ultra-broadband acoustic beam engineering DOI Creative Commons
Hao‐Wen Dong, Chen Shen, Shengdong Zhao

et al.

National Science Review, Journal Year: 2022, Volume and Issue: 9(12)

Published: Feb. 21, 2022

Metasurfaces, the ultrathin media with extraordinary wavefront modulation ability, have shown versatile potential in manipulating waves. However, existing acoustic metasurfaces are limited by their narrow-band frequency-dependent capability, which severely hinders real-world applications that usually require customized dispersion. To address this bottlenecking challenge, we report ultra-broadband achromatic capable of delivering arbitrary and frequency-independent wave properties bottom-up topology optimization. We successively demonstrate three functionalities, including beam steering, focusing levitation, featuring record-breaking relative bandwidths 93.3%, 120% 118.9%, respectively. All metasurface elements show novel asymmetric geometries containing multiple scatters, curved air channels local cavities. Moreover, reveal inversely designed can support integrated internal resonances, bi-anisotropy scattering, collectively form mechanism underpinning Our study opens new horizons for high-efficiency functional devices on demand, promising extension to optical elastic metamaterials.

Language: Английский

Citations

88