Topology‐Optimized Bound States in the Continuum with High‐Q Acoustic Field Enhancement

Advanced Science, Год журнала: 2025, Номер unknown

Опубликована: Март 27, 2025

Achieving high-quality (high-Q) acoustic resonances remains a critical goal in device design, given their exceptional sound manipulation capabilities. However, enhancing Q-factors is often hindered by energy dissipation and material losses, except for leveraging bound states the continuum (BICs). This paper introduces methodology utilizing topology optimization to achieve high-Q based on concept of BICs, which effectively confine waves minimizing leakage. method explores entirely new classes through single unit cell embedded within periodic arrays. By engineering quasi-BIC modes experimentally validating sharp pressure field enhancements, robust technique that enables precise tuning resonance frequencies improves resilience against external perturbations, challenging conventional parameter-tuning approach presented. These findings show promise advancing wave-confining applications, such as harvesting filtering, while pushing performance boundaries devices.

Язык: Английский

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Higher-order topological SAW devices towards topological signal filtering and processing

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Апрель 1, 2025

Topological crystals provide a transformative platform for chip-scale signal processing, offering exceptional robustness, precise wave manipulation, and ultra-compact integration. However, their extension to phononics, particularly controlling surface acoustic (SAW), has thus far been limited lower-order topological states. This restriction confines functionality primarily protected transport while lacking essential features such as frequency-domain tunability, multifunctionality—key challenges that severely hinder adaptability potential revolutionize processing devices. To fill this gap, we experimentally demonstrate higher-order SAW device capable of both time-domain processing. By leveraging coupling effects, achieve multimode coordination significantly enhance enabling control over leakage suppression, blocking, selective conduction within an footprint. More importantly, our system exhibits order-of-magnitude improvement in stability compared conventional phononic crystals, with minimal resonance shifts (~ 0.1%) even under 6% structural deformation. Our work establishes crucial bridge between fundamental physics practical devices, paving the way processors advancing circuits, acoustoelectric integration, AI-driven technologies.

Язык: Английский

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Force-field-induced energy-based design method for arbitrary prescribed modes in elastic metamaterials

Journal of the Mechanics and Physics of Solids, Год журнала: 2025, Номер unknown, С. 106144 - 106144

Опубликована: Апрель 1, 2025

Язык: Английский

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Cementitious metamaterials for low-frequency vibration suppression: Inverse design and performance analysis

Construction and Building Materials, Год журнала: 2025, Номер 476, С. 141308 - 141308

Опубликована: Апрель 15, 2025

Язык: Английский

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Giant Shear-vertical Wave Bandgaps Induced by Diffuse Domain-walls in Ferroelectrics

International Journal of Mechanical Sciences, Год журнала: 2025, Номер 294, С. 110239 - 110239

Опубликована: Апрель 16, 2025

Язык: Английский

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Progressive DNN-metaheuristics for programmable broadband mechanical metamaterial absorbers design

International Journal of Mechanical Sciences, Год журнала: 2025, Номер unknown, С. 110297 - 110297

Опубликована: Апрель 1, 2025

Язык: Английский

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GHz Love-mode TF-SAW phononic crystals based on LiNbO3-on-SiC substrate

Applied Physics Letters, Год журнала: 2025, Номер 126(16)

Опубликована: Апрель 21, 2025

We demonstrate thin-film surface acoustic wave (TF-SAW) phononic crystals (PnCs) by etching a square lattice array of micropores into 300 nm LiNbO3-on-SiC substrate, harnessing the remarkable properties Love modes. Our design enables tailorable bandgaps from 2.026 to 2.347 GHz (approximately 15% bandwidth) along Γ-X, extending up 3.167 Γ-M, with experimental measurements confirming mode attenuation 40 dB. By precisely engineering micropore geometry and layer configuration, we effectively tune both position width bandgaps. These TF-SAW PnCs offer powerful manipulation capabilities scalability, opening horizons for high-throughput communication, sensing, microfluidics, emerging quantum acoustics technologies.

Язык: Английский

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Sound and mechanical impedance behaviors observed in multifunctional modular bio-inspired lattice metamaterials

Materials & Design, Год журнала: 2025, Номер unknown, С. 113987 - 113987

Опубликована: Апрель 1, 2025

Язык: Английский

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Chiral multi-curved shell metamaterials integrating compression-torsion and buckling mechanisms for ideal energy absorption

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Апрель 23, 2025

Metamaterials with compression-torsion or buckling mechanism have demonstrated significant potential for energy absorption through the efficient material utilization. However, metamaterials easily trigger deformation, resulting in low load-bearing capacity, and ones high peak load but fluctuations, accompanying severe localized deformations. Here, we propose chiral multi-curved shell (CMCS) that synergistically couple mechanisms, achieving smooth curves maximizing absorption. The enables to convert compressive deformation into torsional preventing abrupt changes local geometry. Simultaneously, synergy of curved ensures following provides capacity also avoids deformation. This coupled compression-torsion-bending mode achieve its ideal strain storage capacity. Characterized by extensive tests, proposed CMCS exhibit excellent designability. Compared traditional ones, metamaterial achieves a 20-fold increase specific (SEA) higher plateau force 50% efficiency (EEA) due gentler phase, respectively. Multiple drop tests demonstrate their superior impact protection reusability. outstanding performance novel concept lightweight high-strength protective structures materials.

Язык: Английский

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Temperature-Controlled Defective Phononic Crystals with Shape Memory Alloys for Tunable Ultrasonic Sensors

Crystals, Год журнала: 2025, Номер 15(5), С. 412 - 412

Опубликована: Апрель 28, 2025

Phononic crystals (PnCs) have garnered significant interest owing to their ability manipulate wave propagation, particularly through phononic band gaps and defect modes. However, conventional defective PnCs are limited by fixed defect-band frequencies, which restricts adaptability dynamic environments. This study introduces a novel approach for temperature-controlled tunability of integrating shape memory alloys (SMAs) into regions. The reversible phase transformations SMAs, driven temperature variations, induce changes in mechanical properties, enabling real-time adjustment frequencies. An analytical model is developed predict the relationship between temperature-modulated material properties shifts, validated numerical simulations. results demonstrate that frequencies can be dynamically controlled within specified range, thereby enhancing operational bandwidth ultrasonic sensors. Additionally, sensing-performance analysis confirms while shift with temperature, output voltage sensors remains stable, ensuring reliable sensitivity across varying conditions. represents advancement tunable PnC technology, paving way next-generation enhanced reliability complex

Язык: Английский

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