4.7 Review

Emerging topics in nanophononics and elastic, acoustic, and mechanical metamaterials: an overview

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PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES (2021)

Article Multidisciplinary Sciences

Non-Hermitian route to higher-order topology in an acoustic crystal

He Gao et al.

Summary: The study discusses the impact of introducing losses on higher-order topological insulators in an acoustic crystal, demonstrating that losses with non-Hermitian properties can induce the emergence of higher-order topology, paving the way for exploring exotic non-Hermitian-induced topological phases.

NATURE COMMUNICATIONS (2021)

Article Chemistry, Multidisciplinary

Curvature Induced by Deflection in Thick Meta-Plates

Mohammad J. Mirzaali et al.

Summary: This study discusses the use of simple bending of metal plates to achieve various intrinsic curvatures, showing that different unit cell structures can result in plates with different properties. Experimental and numerical results demonstrate that bending along the longitudinal direction of the metal plate induces curvature along the transverse direction, providing a general route for designing advanced functional devices with intrinsically curved geometries.

ADVANCED MATERIALS (2021)

Article Physics, Applied

Dynamic characterization of 3D printed mechanical metamaterials with tunable elastic properties

Mohammad Naghavi Zadeh et al.

Summary: Mechanical metamaterials are advanced engineering materials with tunable elastic properties and a strong influence of Poisson's ratio on damping performance. Geometrical design plays a crucial role in tuning the various types of quasi-static and dynamic properties of such materials.

APPLIED PHYSICS LETTERS (2021)

Article Engineering, Multidisciplinary

Fully decoupling geometry from discretization in the Bloch-Floquet finite element analysis of phononic crystals

S. J. van den Boom et al.

Summary: An immersed enriched finite element method is proposed for analyzing phononic crystals with completely decoupled finite element meshes from geometry. The method effectively transforms non-conforming discretization into an enriched node-to-node periodic discretizations and eliminates the need for generating matching or fitted meshes during the design process. This approach shows the same performance as standard finite element analysis on fitted meshes in analyzing phononic crystals in structured meshes.

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING (2021)

Article Physics, Applied

Nonlinear waves in flexible mechanical metamaterials

B. Deng et al.

Summary: Flexible mechanical metamaterials are compliant structures engineered to achieve unique properties through large deformations of their components. While their static properties have been extensively studied, research on their dynamic properties, especially in the nonlinear regime induced by their high deformability, is still in its early stages. Recent studies have shown that these systems offer new opportunities for controlling large-amplitude elastic waves.

JOURNAL OF APPLIED PHYSICS (2021)

Review Instruments & Instrumentation

Acoustic-elastic metamaterials and phononic crystals for energy harvesting: a review

Guobiao Hu et al.

Summary: Metamaterials and phononic crystals with artificially designed periodic microstructures have unique properties and applications in energy harvesting. The integration design strategy and manipulation of refractive index profile can enhance energy harvesting efficiency.

SMART MATERIALS AND STRUCTURES (2021)

Article Multidisciplinary Sciences

Roton-like acoustical dispersion relations in 3D metamaterials

Yi Chen et al.

Summary: The authors introduce beyond-nearest-neighbour interactions as a mechanism for molding the flow of waves in acoustic metamaterials. They find that for strong third-nearest-neighbour interactions, this mechanism allows for engineering roton-like acoustical dispersion relations under ambient conditions.

NATURE COMMUNICATIONS (2021)

Article Chemistry, Physical

Elasticity Approach to Predict Shape Transformation of Functionally Graded Mechanical Metamaterial under Tension

Mohammad Javad Khoshgoftar et al.

Summary: Re-entrant structures are widely used in mechanical metamaterial design, allowing for simultaneous tuning of elastic properties by changing geometric parameters. A fast and direct design approach using elasticity theory and finite element modeling has been proposed, with applications in predicting complex deformation shapes and creating programmable mechanical metamaterials with shape matching properties for exoskeletal and soft robotic devices.

MATERIALS (2021)

Article Materials Science, Multidisciplinary

Engineering Plasmonic Colloidal Meta-Molecules for Tunable Photonic Supercrystals

Pau Molet et al.

Summary: Ordered arrays of metal nanoparticles can generate surface lattice resonances with higher quality factors, showing great potential for engineering light-matter interactions. The internal architecture of gold-nanoparticle meta-molecules influences the optical response of plasmonic supercrystals.

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Article Physics, Applied

Selective Mode Conversion and Rainbow Trapping via Graded Elastic Waveguides

Jacopo M. De Ponti et al.

Summary: Experimental success in achieving wave-mode conversion and rainbow trapping in an elastic waveguide loaded with an array of resonators. Rainbow trapping induced by spatial wave velocity variation through gently changing consecutive resonator lengths, combined with wave-speed reduction and reflection mechanism for flexural wave mode conversion into torsional waves. Framework may offer opportunities in wave manipulation through structural components with concurrent wave-conversion and energy-trapping capabilities.

PHYSICAL REVIEW APPLIED (2021)

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Arbitrary-curved waveguiding and broadband attenuation in additively manufactured lattice phononic media

Anastasiia O. Krushynska et al.

Summary: The article is authored by The Author(s) in 2021 and published by Elsevier Ltd. It is an open access article under the CC BY license.

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Acoustic tweezer with complex boundary-free trapping and transport channel controlled by shadow waveguides

Junfei Li et al.

Summary: Acoustic tweezers utilize a single pair of sources and a shadow waveguide to achieve complex particle trapping and manipulation in a boundary-free chamber, without the need for interior structures that would interfere with flow or transport.

SCIENCE ADVANCES (2021)

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Ventilated metamaterials for broadband sound insulation and tunable transmission at low frequency

Zhenqian Xiao et al.

Summary: Research on acoustical meta-structures made of metamaterials show promising results in sound insulation, with the ability to open high transmission windows at specific frequencies.

EXTREME MECHANICS LETTERS (2021)

Article Physics, Multidisciplinary

Three dimensional acoustic tweezers with vortex streaming

Junfei Li et al.

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COMMUNICATIONS PHYSICS (2021)

Proceedings Paper Engineering, Electrical & Electronic

Coupling Helmholtz resonators for sound manipulation

R. Sabat et al.

Summary: In this work, the interaction between Helmholtz resonators is discussed using the finite element method. It is shown that coupling between two spheres results in two resonant modes at low frequencies, one being symmetric while the other is anti-symmetric. The behavior of these modes is discussed in relation to geometrical and physical parameters, as well as the effects of the thermo-viscous properties of air on their behavior.

2021 FIFTEENTH INTERNATIONAL CONGRESS ON ARTIFICIAL MATERIALS FOR NOVEL WAVE PHENOMENA (METAMATERIALS) (2021)

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Exploiting localized transition waves to tune sound propagation in soft materials

Audrey A. Watkins et al.

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PHYSICAL REVIEW B (2021)

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Nonreciprocal and even Willis couplings in periodic thermoacoustic amplifiers

Come Olivier et al.

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PHYSICAL REVIEW B (2021)

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Experimental realization of a pillared metasurface for flexural wave focusing

Wan Wang et al.

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APL MATERIALS (2021)

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Templated Colloidal Self-Assembly for Lattice Plasmon Engineering

Leonardo Scarabelli et al.

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ACCOUNTS OF MATERIALS RESEARCH (2021)

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Classification of emerging patterns in self-assembled two-dimensional magnetic lattices

Ehsan Norouzi et al.

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION (2020)

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Proceedings Paper Computer Science, Cybernetics

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