Dual Dirac cones in elastic Lieb-like lattice metamaterials

Li, Bing; Li, Zheng; Christensen, Johan; Tan, K. T.

doi:10.1063/1.5085782

Cited by 17 publications

(6 citation statements)

References 45 publications

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“…First, we consider the case when the effective mass density and elastic compliance (which is the reciprocal of the modulus of elasticity) are simultaneously near zero [113][114][115][116][117][118][119]. In this case, the corresponding phase velocity takes on near-infinity (implying that the refractive index is near-zero) because the phase velocity is inversely proportional to the square root of the mass density and elastic compliance.…”

Section: Near-zero and Near-infinity Materials Propertiesmentioning

confidence: 99%

Elastic metamaterials for guided waves: from fundamentals to applications

Lee,

Kim

2023

Smart Mater. Struct.

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Guided waves, elastic waves propagating through bounded structures, play a pivotal role in various applications, including ultrasonic non-destructive testing and structural health monitoring. Recently, elastic metamaterials artificially engineered to exhibit physical properties not typically seen in nature have emerged as a ground-breaking approach, heralding a new era in guided wave-based technologies. These metamaterials offer innovative solutions to overcome the inherent constraints of traditional guided wave-based technology. This paper comprehensively reviews elastic metamaterials from their fundamental principles to diverse applications, focusing on their transformative impact in guided wave manipulation.

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Section: Near-zero and Near-infinity Materials Propertiesmentioning

confidence: 99%

Elastic metamaterials for guided waves: from fundamentals to applications

Lee,

Kim

2023

Smart Mater. Struct.

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“…Phononic metamaterials with flat or nearly-flat bands have been investigated previously [30][31][32][33], mainly in the context of modifying refraction properties. More broadly, flat bands provide a setting for exotic strongly-correlated phenomena in electron systems [34] and a means to control signal speed and diffraction in photonics [35].…”

Section: < L a T E X I T S H A 1 _ B A S E 6 4 = " / U S T F Z H D B ...mentioning

confidence: 99%

Stopping and reversing sound via dynamic dispersion tuning in a phononic metamaterial

Karki,

Paulose

2020

Preprint

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Slowing down, stopping, and reversing a signal is a core functionality for information processing. Here, we show that this functionality can be realized by tuning the dispersion of a periodic system through a dispersionless, or flat, band. Specifically, we propose a new class of phononic metamaterials based on plate resonators, in which the phonon band dispersion can be changed from an acoustic to an optical character by modulating a uniform prestress. The switch is enabled by the change in sign of an effective coupling between fundamental modes, which generically leads to a nearly dispersion-free band at the transition point. We demonstrate how adiabatic tuning of the band dispersion can immobilize and reverse the propagation of a sound pulse in simulations of a one-dimensional resonator chain. Our study relies on the basic principles of thin-plate elasticity independently of any specific material, making our results applicable across varied length scales and experimental platforms. More broadly, our approach could be replicated for signal manipulation in photonic metamaterials and electronic heterostructures.

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“…In contrast, our review focuses on the fundamental physics of DCZIMs, comparison of DCZIM with zero-index materials based on volume plasmon, fishnet metamaterials and doped ENZ medium, classification of DCZIMs, demonstration of optical DCZIMs, and promising potential applications of DCZIMs. In addition to photonic metamaterials, the concept of DCZIMs has already been adopted by other kinds of metamaterials including acoustic [36][37][38][39][40][41][42][43][44][45][46][47] and elastic metamaterials 48,49 .…”

Section: Introductionmentioning

confidence: 99%

Dirac-like cone-based electromagnetic zero-index metamaterials

Chan

Mazur

2021

Light Sci Appl

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Metamaterials with a Dirac-like cone dispersion at the center of the Brillouin zone behave like an isotropic and impedance-matched zero refractive index material at the Dirac-point frequency. Such metamaterials can be realized in the form of either bulk metamaterials with efficient coupling to free-space light or on-chip metamaterials that are efficiently coupled to integrated photonic circuits. These materials enable the interactions of a spatially uniform electromagnetic mode with matter over a large area in arbitrary shapes. This unique optical property paves the way for many applications, including arbitrarily shaped high-transmission waveguides, nonlinear enhancement, and phase mismatch-free nonlinear signal generation, and collective emission of many emitters. This review summarizes the Dirac-like cone-based zero-index metamaterials’ fundamental physics, design, experimental realizations, and potential applications.

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Dual Dirac cones in elastic Lieb-like lattice metamaterials

Cited by 17 publications

References 45 publications

Elastic metamaterials for guided waves: from fundamentals to applications

Elastic metamaterials for guided waves: from fundamentals to applications

Stopping and reversing sound via dynamic dispersion tuning in a phononic metamaterial

Dirac-like cone-based electromagnetic zero-index metamaterials

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