Article
Materials Science, Multidisciplinary
Yu Huang, Xiaoming Zhou
Summary: This study demonstrates non-reciprocal sound transmission in an electro-acoustic system using time-modulated circuits, which can create asymmetric transmission in multiple frequency bands. The ability to tune circuit parameters for non-reciprocal behavior provides a platform for designing compact and efficient noise control devices.
ACTA MECHANICA SOLIDA SINICA
(2022)
Article
Physics, Multidisciplinary
Xinhua Wen, Xinghong Zhu, Alvin Fan, Wing Yim Tam, Jie Zhu, Hong Wei Wu, Fabrice Lemoult, Mathias Fink, Jensen Li
Summary: This study demonstrates the achievement of unidirectional amplification in a non-Hermitian system through the control of space-time varying metamaterials. By dynamically varying the gain and loss and introducing modulation phase delay, the efficiency of frequency conversion is increased. This experimental realization provides further opportunities to study non-Hermitian topological physics in dynamic and nonreciprocal systems.
COMMUNICATIONS PHYSICS
(2022)
Article
Multidisciplinary Sciences
Lianchao Wang, Julio A. Iglesias Martinez, Gwenn Ulliac, Bing Wang, Vincent Laude, Muamer Kadic
Summary: In this paper, a model for non-reciprocal and non-Newtonian mechanical metamaterials is demonstrated by combining the concept of local resonances and fixing boundaries. Via computational models and impact experiments, the authors show that stiffness substantially changes as a function of the loading velocity.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Zhiling Zhou, Sibo Huang, Dongting Li, Jie Zhu, Yong Li
Summary: Utilizing nonlocality between subunits, ultrathin acoustic metamaterials achieve broadband sound absorption and desired impedance profiles. The over-damped recipe and the reduced excessive response recipe are employed for impedance matching and broadband near-perfect absorption.
NATIONAL SCIENCE REVIEW
(2022)
Article
Multidisciplinary Sciences
Quansen Wang, Zhiling Zhou, Dongmei Liu, Hua Ding, Min Gu, Yong Li
Summary: This paper introduces a method to achieve nonreciprocal control of the TC beam in the acoustic system by introducing the rotational Doppler effect, demonstrating isolated and propagating states of the vortex beam can be realized by controlling the rotation direction, representing nonreciprocal propagation.
Article
Biochemistry & Molecular Biology
Michael Forsthofer, Michael Schutte, Harald Luksch, Tobias Kohl, Lutz Wiegrebe, Boris P. Chagnaud
Summary: The rattlesnakes generate acoustic signals by clashing keratinous segments at the tip of their tails, creating a continuous signal recognized by other animals. As a potential threat approaches, the rattlesnakes increase their rattling rate, similar to sensors while parking a car, before abruptly switching to a higher rate. This change in rattling rate affects distance judgments by humans and acts as an interspecies communication signal.
Article
Physics, Applied
Chen Shao, Yuanzhou Zhu, Houyou Long, Chen Liu, Ying Cheng, Xiaojun Liu
Summary: In this paper, we propose a design methodology for an ultra-broadband sound absorber based on coupled-mode theory, and experimentally demonstrate its sound absorption performance. This has significant implications for acoustic engineering.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Yun Zhou, Prabhakar R. Bandaru, Daniel F. Sievenpiper
Summary: The study introduces a subwavelength sound channel formed at the interface of two metamaterials using a Helmholtz resonator-based approach for sound confinement. Experimental results show that the sound confinement is robust to frequency and spatial disorder, indicating the possibility of confining sound to a point.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Mingxin Xu, Jizhen Wang, William S. S. Harley, Peter V. S. Lee, David J. J. Collins
Summary: Acoustic holography enables the generation of designed acoustic fields for manipulating microscale objects. However, the limitations of static 3D printed acoustic holographic phase plates or large aperture sizes prevent rapid alteration of the generated fields. In this study, a programmable acoustic holography approach is demonstrated, allowing for the creation of multiple discrete or continuously variable acoustic targets. By modifying the sound speed of an intervening fluid media, the desired acoustic fields can be produced. This approach has the advantages of flexibility in generating various acoustic patterns and has broad potential in areas such as microfluidics, cell/tissue engineering, real-time sensing, and medical ultrasound.
Article
Physics, Applied
Janghoon Kang, Michael R. Haberman
Summary: This article investigates the spatiotemporal modulation of the surface acoustic admittance of a metasurface diffuser to improve sound diffusion. By using mathematical and finite element models, it demonstrates that the effects of spatial periodicity can be mitigated without introducing aperiodic spacing, thus reducing diffuser thickness and improving the diffusivity of the backscattered field.
APPLIED PHYSICS LETTERS
(2022)
Article
Acoustics
A. Dell, A. Krynkin, K. V. Horoshenkov, G. Sailor
Summary: This paper presents new evidence, both experimental and numerical, that demonstrates the creation of a low-frequency bandgap in a pipe wall due to perforations, where sound waves attenuate rapidly. The perforations are modelled as an acoustically soft boundary condition, leading to the formation of a low-frequency bandgap starting from 0 Hz. The upper limit of the bandgap is determined by the dimensions and separation of the perforations. An analytical model based on the transfer matrix method is proposed and validated against numerical predictions and experimental evidence.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Materials Science, Multidisciplinary
Qian Wu, Hui Chen, Hussein Nassar, Guoliang Huang
Summary: The research investigates non-reciprocal Rayleigh wave propagation in a continuous two-dimensional medium, utilizing a modulated array of spring-mass oscillators to break time-reversal symmetry and reciprocity. Analytical study and numerical simulation are conducted to characterize the propagation and validate dispersion-engineered bandgaps, providing insights for versatile control of Rayleigh wave propagation.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Physics, Applied
Sheng Wan, Liyun Cao, Yi Zeng, Tong Guo, Mourad Oudich, Badreddine Assouar
Summary: This letter introduces a compact low-frequency non-reciprocal metamaterial design for flexural waves. The non-reciprocal wave propagation is achieved by modulating the stiffness of the resonators and introducing a phase shift.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Jinying Fan, Lingzhi Li, Jiejun Zhang, Xinhuan Feng, Bai-Ou Guan, Jianping Yao
Summary: This paper introduces a PT-symmetric optoelectronic oscillator based on non-reciprocal electro-optic modulation, where two mutually coupled optoelectronic loops with gain and loss are implemented through copropagating and counterpropagating modulation to achieve PT symmetry. Experimental results demonstrate the generation of a microwave signal with low phase noise through single-mode oscillation once the gain/loss coefficient exceeds the coupling coefficient. The proposed OEO provides a new solution to overcome the mode selection problem in long-cavity OEOs and has a simpler architecture compared to existing PT-symmetric OEOs.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Danilo Karlicic, Milan Cajic, Stepa Paunovic, Aleksandar Obradovic, Sondipon Adhikari, Johan Christensen
Summary: Non-reciprocal wave propagation has attracted much attention in recent years, and researchers have explored breaking reciprocity using space-and/or time-dependent constitutive material properties to overcome the limitations of conventional mechanical lattices. This study investigates non-reciprocity in elastic locally resonant and phononic-like one-dimensional lattices with time-modulated mass and stiffness properties. The frequency-band structures and asymmetric band gaps are determined for each configuration, and the technique is extended to study more complex two-dimensional lattices.
APPLIED MATHEMATICAL MODELLING
(2023)
