Observation of phononic skyrmions based on hybrid spin of elastic waves

Cao, Liyun; Wan, Sheng; Zeng, Yi; Zhu, Yifan; Assouar, Badreddine

doi:10.1126/sciadv.adf3652

Cited by 17 publications

(4 citation statements)

References 57 publications

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“…Noting that the spinning nature of elastic waves has recently received considerable attention 41 – 48 , our findings can be a promising strategy to efficiently generate various elastic spins. For instance, it may be possible to generate a circularly polarized bulk shear wave from a linearly polarized bulk longitudinal wave by comprehensively utilizing the longitudinal-to-shear mode conversion and the linear-to-circular polarization conversion.…”

Section: Discussionmentioning

confidence: 90%

Perfect circular polarization of elastic waves in solid media

Lee,

Kweun,

Lee

et al. 2024

Nat Commun

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Elastic waves involving mechanical particle motions of solid media can couple volumetric and shear deformations, making their manipulation more difficult than electromagnetic waves. Thereby, circularly polarized waves in the elastic regime have been little explored, unlike their counterparts in the electromagnetic regime, where their practical usage has been evidenced in various applications. Here, we explore generating perfect circular polarization of elastic waves in an isotropic solid medium. We devise a novel strategy for converting a linearly polarized wave into a circularly polarized wave by employing an anisotropic medium, which induces a so-far-unexplored coupled resonance phenomenon; it describes the simultaneous occurrence of the Fabry-Pérot resonance in one diagonal plane and the quarter-wave resonance in another diagonal plane orthogonal to the former with an exact 90° out-of-phase relation. We establish a theory explaining the involved physics and validate it numerically and experimentally. As a potential application of elastic circular polarization, we present simulation results demonstrating that a circularly polarized elastic wave can detect an arbitrarily oriented crack undetectable by a linearly polarized elastic wave.

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Section: Discussionmentioning

confidence: 90%

Perfect circular polarization of elastic waves in solid media

Lee,

Kweun,

Lee

et al. 2024

Nat Commun

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“…The results generalize to arbitrary multilayered structures because the expressions in each layer are similar. Such multilayered structures are beneficial in realizing refractive-index-engineered artificial metamaterials [47,48] and have also been widely studied in fields concerning acoustic waves [49], sound waves [50], and elastic waves [51]. The spin-orbit properties of topological defects are described by the optical Dirac equation [52]:…”

Section: Resultsmentioning

confidence: 99%

Topological state transitions in electromagnetic topological defects

Shi,

Gou,

Zhang

et al. 2023

Preprint

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The recent emergence of electromagnetic topological defects has attracted wide interest in fields from topological photonics to deep-subwavelength light-mater interactions. Previously, much of the research has focused on constructing specific topological defects but the fundamental theory describing the physical mechanisms underlying their formation and transitions is lacking. Here, we present a spin–orbit coupling based theory describing such mechanisms for various configurations of spin topological defects in confined electromagnetic fields. The results reveal that their formation originates from the conservation of total angular momentum and that their transitions are determined by anisotropic spin–orbit couplings. By engineering the spin–orbit couplings, we observe the formation and transitions of Neél-type, twisted-type, and Bloch-type spin topological defects in confined electromagnetic fields. A stable Block-type spin topological defect is reported for the first time. Our theory can also describe the transitions of field topological defects. The findings enrich the portfolio of electromagnetic topological defects, deepen our understanding of conserved laws, spin–orbit couplings and transitions of topological defects in confined electromagnetic systems, and predict applications in high-density optical data transmissions and chiral quantum optics.

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“…Elastic metamaterials that selectively transmit a specific guided wave mode have also been proposed [225][226][227]. There have recently been reports of the formation of a novel hybrid spin of elastic waves by mixing distinct guided wave modes [228][229][230][231][232].…”

Section: Mode Conversionmentioning

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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Observation of phononic skyrmions based on hybrid spin of elastic waves

Cited by 17 publications

References 57 publications

Perfect circular polarization of elastic waves in solid media

Perfect circular polarization of elastic waves in solid media

Topological state transitions in electromagnetic topological defects

Elastic metamaterials for guided waves: from fundamentals to applications

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