Article
Physics, Applied
Yu-jing Lu, Hong-yu Zou, Jiao Qian, Yin Wang, Yong Ge, Shou-qi Yuan, Hong-xiang Sun, Xiao-jun Liu
Summary: Acoustic metagratings provide various sound modulation approaches through high-efficiency diffractions, with the extension of the generalized Snell's law promoting the design of metagratings with aperiodic phase profiles; however, realizing reflected aperiodic metagratings and their multifunctional devices remains a challenge. The study theoretically designs and experimentally demonstrates a class of reflected aperiodic metagratings and multifunctional acoustic lenses, overcoming the limitations of the generalized Snell's law and experimentally validating theoretical predictions of sound reflections created by aperiodic metagratings with arbitrary phase gradients. The research paves the way for modulating sound reflections and designing reflected multifunctional devices with promising applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Xiao Li, Daxing Dong, Jiaqing Liu, Youwen Liu, Yangyang Fu
Summary: In this work, an acoustic metagrating (MG) with perfect retroreflection is realized using an inverse-design scheme, improving upon the limited efficiency of previous designs. The study also highlights the importance of evanescent guided modes in achieving perfect retroreflection, and identifies an orthogonal relationship between the contribution ratios of odd and even guided modes.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Xin-di Feng, Yin Wang, Li-juan Shi, Hong-yu Zou, Yu-jing Lu, Ding Jia, Yong Ge, Yi-jun Guan, Shou-qi Yuan, Hong-xiang Sun, Xiao-jun Liu
Summary: Recently, acoustic vortices with orbital angular momentum (OAM) have attracted attention due to their extensive applications. However, there are challenges in modulating vortex beams and designing advanced sound devices due to restrictions on metasurface structures and critical order of propagating vortex beams.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Acoustics
Long-Sheng Zeng, Ya-Xi Shen, Xin-Sheng Fang, Yong Li, Xue-Feng Zhu
Summary: This study introduces a prototype of retroreflection tweezer based on metagratings, enabling particle levitation and contactless movement. Unlike traditional tweezers, this retroreflection tweezer is designed for oblique incidence, providing more degrees of freedom for real-time observation.
Article
Physics, Applied
Chuanjie Hu, Yadong Xu, Shan Zhu, Huanyang Chen
Summary: Phase-gradient metagratings, integrating homogeneous dielectric materials with gradient thickness into periodical metallic slits, have shown unconventional abilities to manipulate electromagnetic waves, with nearly perfect broadband transmission achieved in a passive phased metagrating based on mode conversion. The effectiveness of the scheme is validated by theoretically designing anomalous scattering and planar metalenses with excellent efficiency, proving the potential application of this structure in other physical fields such as acoustics and water waves.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Hao Ge, Shuai Liu, Xiang-Yuan Xu, Zi-Wei Long, Yuan Tian, Xiao-Ping Liu, Ming-Hui Lu, Yan-Feng Chen
Summary: The recent discovery of optical spatiotemporal (ST) vortex beams with transverse orbital angular momentum (OAM) has attracted attention and is expected to have practical applications in various fields. This study focuses on the development of ST vortex beams in acoustics and demonstrates the generation of Bessel-type ST acoustic vortex beams. The study provides a comprehensive characterization of the ST vortex beams and explores their versatility in controlling wave phenomena.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Fluids & Plasmas
G. N. Koutsokostas, G. Theocharis, T. P. Horikis, P. G. Kevrekidis, D. J. Frantzeskakis
Summary: The study investigates the transverse instability and dynamics of bright soliton stripes in two-dimensional nonlocal nonlinear media. It is found that the soliton shape experiences exponential growth in time due to the transverse instability, with the characteristic timescale depending on the square root of the nonlocality parameter. The nonlocality-induced suppression of the transverse instability is highlighted in the results, which are supported by both analytical predictions and numerical simulations.
Article
Physics, Applied
Zhixiang Li, Yi Lei, Kai Guo, Zhongyi Guo
Summary: This paper proposes a double-layer acoustic metasurface (DAM) composed of a fixed lower acoustic metasurface (LAM) and a rotatable upper acoustic metasurface (UAM) for the generation of mode-reconfigurable acoustic orbital angular momentum (OAM). By rotating the UAM, the incident acoustic plane wave can be efficiently converted into vortex acoustic waves with distinguishable purity. The influences of parameters on the purity of the generated topological charges have been investigated and discussed.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Kim Pham, Agnes Maurel
Summary: This paper analyzes the propagation of acoustic waves in a space-time modulated grating moving in air. The authors derive a homogenized nonreciprocal model in the subwavelength regime and characterize the properties of the modulated metagratings in terms of scattering properties and guided wave dispersion. They demonstrate the effect of the space-time modulation on the dispersion relation, Brewster angle, Fabry-Perot resonances, and the potential for achieving negative refraction or perfect transparency.
Article
Acoustics
Xuebin Zhang, Lin Li, Kangling Li, Tao Liu, Jun Zhang, Ning Hu
Summary: Wave splitting, an important application in wavefront modulation, has significant significance in practical engineering and academia. However, the available techniques for wave splitting are scarce aside from conventional metasurfaces governed by the generalized Snell's law. In this study, based on the newly proposed high-order diffraction theory, we design a simply structured elastic metagrating for the splitting of flexural waves in plate-like structures. Theoretical models, numerical simulations, and experiments are conducted to validate the effectiveness of our designs. This study provides a general method for designing wave splitters.
Article
Instruments & Instrumentation
Kemeng Gong, Xin Zhou, Jiliang Mo
Summary: In this study, a continuously tunable acoustic metasurface is designed and fabricated to produce transmitted acoustic vortices with multiple orders. The proposed metasurface shows promising applications in real-time acoustic rotational manipulations such as acoustic microfluidics, cell manipulation, acoustic tweezers, and acoustic communication.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Physics, Applied
Shifang Guo, Zhen Ya, Pengying Wu, Yan Li, Shukuan Lu, Lei Zhang, Mingxi Wan
Summary: This study compared the thermal ablation induced by conventional focused ultrasound (cFUS), split-focus ultrasound (sFUS), and acoustic vortex (AV) in tissue phantoms containing phase-change nanodroplets and mouse tumors. The results showed that AV significantly enhanced the thermal ablation efficiency compared with cFUS, attributed to its larger focal region. The proposed method may solve the general issue of low efficiency often observed in cFUS ablation and further promote the development of other ultrasound treatments.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Lijuan Fan, Jun Mei
Summary: This article presents a new design approach for acoustic metagratings that can achieve different and switchable transmission and reflection functionalities of sound waves. Through a systematic design method, simultaneous and high-efficiency control over both reflected and transmitted waves is achieved, allowing for switching between different functionalities by changing operation frequency or incident angles, leading to robust and perfect wave-front manipulation effects.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Applied
Xinsheng Fang, Nengyin Wang, Wenwei Wu, Weibo Wang, Xuewen Yin, Xu Wang, Yong Li
Summary: Metagratings, which are characterized by scattering matrices, show promise for efficient and anomalous wave-diffraction control. In this study, we focus on the degenerated states of scattering matrices induced by non-Hermiticity, which encode unique scattering behaviors. We investigate the exotic degeneracies, exceptional points (EPs), and diabolic points (DPs) in these scattering systems both theoretically and experimentally. We demonstrate the distinct response strength induced by EP and DP, with extremely asymmetrical reflection occurring on the EP state in a metagrating, offering opportunities for microvariable detection and external perturbation monitoring. In contrast, a stable dual-angle absorber is proposed on the DP state, which is almost unaffected by external perturbations. Our work may pave the way for extreme wave manipulation via non-Hermitian metagratings on degenerated states.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Nathan Geib, Aritra Sasmal, Zhuzhu Wang, Yuxin Zhai, Bogdan-Ioan Popa, Karl Grosh
Summary: This paper introduces a new nonlocal active metamaterial architecture that utilizes a purely active approach to tailor the acoustic field. The analytical closed-form equations describing the acoustic properties allow for engineering extremely nonreciprocal wave transmission. The system's remarkable flexibility is demonstrated through electronic tuning of acoustic isolation characteristics, highlighting the expansive design space uncovered by this approach.
Article
Acoustics
Tianyu Gu, Zhihui Wen, Liangshu He, Minle Yu, Yong Li, Yan Li, Yabin Jin
Summary: We study a lightweight metastructure that can simultaneously reduce vibration and noise in a broad low-frequency range through theoretical, numerical, and experimental methods. By introducing spiral slits and micro-perforations in the panel and core plate, respectively, we achieve broadband low-frequency sound absorption and vibration isolation. This multifunctional metastructure provides a new route to design lightweight load-bearing structures with noise and vibration reduction performance for potential applications in aerospace engineering and transportation vehicles.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Botao Liu, Sibo Huang, Bo Zheng, Xuefeng Chen, Jia Zhao, Xinrui Qi, Yong Li, Shengchun Liu
Summary: This study proposes an underwater sound-absorbing composite lattice with low-frequency and ultra-broadband characteristics. The lattice cells convert incident longitudinal waves into transverse waves through multiple local resonance coupling and multiple scattering. The proposed composite lattice provides a practical approach to designing ultrathin low-frequency and ultra-broadband acoustic absorption coating for underwater noise suppression.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Xiao Pan, Longsheng Zeng, Yong Li, Xuefeng Zhu, Yabin Jin
Summary: This study numerically and experimentally analyzes FZP lenses around 5 MHz and achieves stable subwavelength underwater sound focusing. The relationship between focal spot size and the ratio of focal length to lens diameter, as well as the relationship between focal length and working frequency, is explored.
Article
Physics, Applied
Yihuan Zhu, Ruizhi Dong, Dongxing Mao, Xu Wang, Yong Li
Summary: Nonlocal metasurfaces, harnessing nonlocality, have demonstrated unmatched abilities in wave-front manipulation efficiency. In this study, we show that nonlocality can serve as a powerful tool to achieve significant enhancement in working bandwidth, demonstrated by an acoustic open metasurface that allows airflow while blocking sound transmission.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Zhiling Zhou, Bin Jia, Nengyin Wang, Xu Wang, Yong Li
Summary: In this study, we demonstrate the concept of extreme chirality based on orbital angular momentum (OAM) helicity modulation, achieved by a mirror-symmetry-broken metasurface. This opens up new possibilities for exploring chirality with unlimited states.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Xinsheng Fang, Nengyin Wang, Wenwei Wu, Weibo Wang, Xuewen Yin, Xu Wang, Yong Li
Summary: Metagratings, which are characterized by scattering matrices, show promise for efficient and anomalous wave-diffraction control. In this study, we focus on the degenerated states of scattering matrices induced by non-Hermiticity, which encode unique scattering behaviors. We investigate the exotic degeneracies, exceptional points (EPs), and diabolic points (DPs) in these scattering systems both theoretically and experimentally. We demonstrate the distinct response strength induced by EP and DP, with extremely asymmetrical reflection occurring on the EP state in a metagrating, offering opportunities for microvariable detection and external perturbation monitoring. In contrast, a stable dual-angle absorber is proposed on the DP state, which is almost unaffected by external perturbations. Our work may pave the way for extreme wave manipulation via non-Hermitian metagratings on degenerated states.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Manufacturing
Nengyin Wang, Chengcheng Zhou, Sheng Qiu, Sibo Huang, Bin Jia, Shanshan Liu, Junmei Cao, Zhiling Zhou, Hua Ding, Jie Zhu, Yong Li
Summary: In this study, a meta-silencer with intensive mode density is proposed to effectively suppress resonance dispersion and achieve designable timbre. The design enables high-efficiency sound attenuation in a broadband frequency range, with controllable sound attenuation and designable timbre characteristics. This research opens a new pathway for timbre manipulation using passive resonances-controlled acoustic metamaterials, inspiring the development of innovative multifunctional devices in noise-control engineering, impedance engineering, and architectural acoustics.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2023)
Article
Computer Science, Interdisciplinary Applications
Tengjiao He, Shiqi Mo, Erzheng Fang, Xinyu Liu, Yong Li
Summary: This paper presents ESM-FLOW, a meshless, wave-based method for modeling sound propagation in 3D axisymmetric lined ducts. ESM-FLOW combines the numerical efficiency and accuracy of typical BIF methods while overcoming the limitations imposed by uniform media. It is highly applicable to the acoustic design of engines and ventilation systems.
ENGINEERING WITH COMPUTERS
(2023)
Article
Engineering, Mechanical
Qiang Li, Ruizhi Dong, Dongxing Mao, Xu Wang, Yong Li
Summary: Due to the strong wave-matter interaction at resonance, meta-absorbers have the potential to effectively eliminate low-frequency sound even at small thicknesses. A traditional approach to achieving broadband low-frequency absorption is to use a graded bank of tuned resonators, but this leads to a large size. In this study, a compact broadband absorber is presented using detuned resonators. The absorber has a reduced thickness and a compact surface area due to the twisting arrangement of the elements. Simulations and experiments show that the absorber has an effective absorption band from 299 to 623 Hz with a thickness of just 52 mm, offering a compact solution for customizable noise absorption.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Acoustics
Runcheng Cai, Yabin Jin, Yong Li, Jie Zhu, Hehua Zhu, Timon Rabczuk, Xiaoying Zhuang
Summary: In this study, we investigate the Parity-Time (PT) symmetric metaplate with balanced loss and gain, and achieve coherent perfect absorption and lasing effects for flexural waves. We also explore the exceptional points (EP) as thresholds of phase transitions and realize unidirectional reflectionless behavior for incident waves by adjusting circuit parameters. Our study provides insights into the origins and sensitivities of non-Hermitian exceptional points for elastic waves.
JOURNAL OF SOUND AND VIBRATION
(2023)
Review
Physics, Multidisciplinary
Xu Wang, Ruizhi Dong, Yong Li, Yun Jing
Summary: Acoustic metasurfaces, with their advanced capabilities of wave manipulation at a small size, are at the forefront of acoustic material research. However, conventional metasurfaces are limited by their underlying physics and design principles. Recent research has shown that harnessing non-locality and losses can enhance the functionality of acoustic metasurfaces, leading to a new design paradigm. This review summarizes the progress of non-local and non-Hermitian acoustic metasurfaces, discusses their critical role, and explores their potential and challenges.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Haiyan Zhang, Shanshan Liu, Zhiwei Guo, Shengyu Hu, Yuguang Chen, Yunhui Li, Yong Li, Hong Chen
Summary: In this work, we propose theoretically and demonstrate experimentally unidirectional perfect absorption in a non-Hermitian acoustic system with the help of the topological bound state in the continuum (BIC). The system exhibits extreme asymmetry, with acoustic perfect absorption at the left incidence and near-total reflection at the right incidence. This study bridges the gap between scattering characteristics of non-Hermitian acoustic systems and topological scattering singularities, contributing to the research of novel non-Hermitian physics and practical applications of advanced absorbers and sensors.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Physics, Applied
Shanshan Liu, Sibo Huang, Zhiling Zhou, Pei Qian, Bin Jia, Hua Ding, Nengyin Wang, Yong Li, Jie Chen
Summary: We report the theoretical and experimental observation of a Friedrich-Wintgen BIC with bridging near-field coupling in an asymmetric two-state acoustic system. By tuning the diameter and position of the bridging tube, we can effectively modulate the near-field coupling effect of the presented system and achieve a Friedrich-Wintgen BIC, as well as a quasi-BIC-based high Q-factor perfect absorption.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Mechanical
Xinsheng Fang, Xuewen Yin, Jian Wu, Yongsheng Li, Hongyun Li, Weibo Wang, Yong Li, Wenwei Wu
Summary: In this study, a metagrating is constructed with a single layer viscoelastic medium, periodic cylindrical cavities, and a steel plate, and demonstrated as a tunable quasi-perfect absorber in low frequency. By utilizing effective medium approximation and genetic algorithm optimization, tunable absorbers with deep subwavelength thicknesses can be achieved. Broadband absorption underwater is further improved by using multi-layer metagratings and converting longitudinal waves efficiently into shear waves through local resonance coupling and multiple scattering effects. The adoption of a metagrating comprising multi-layer voids with random periods enables precise modulation of surface impedance in the target spectrum, leading to quasi-perfect absorption performance in broadband. These findings will contribute to the design of lightweight underwater absorbers to enhance the stealth performance of vehicles.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Review
Physics, Applied
Lujun Huang, Sibo Huang, Chen Shen, Simon Yves, Artem S. Pilipchuk, Xiang Ni, Seunghwi Kim, Yan Kei Chiang, David A. Powell, Jie Zhu, Ya Cheng, Yong Li, Almas F. Sadreev, Andrea Alu, Andrey E. Miroshnichenko
Summary: Acoustic resonances in open systems, characterized by complex eigenfrequencies, play a fundamental role in manipulating acoustic wave radiation and propagation. Recent advances in non-Hermitian open systems have led to exciting applications in sound manipulation and acoustic wave-based devices.
NATURE REVIEWS PHYSICS
(2023)
