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
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
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)
Article
Materials Science, Multidisciplinary
Huu Nguyen Bui, Thanh Son Pham, Jong-Wook Lee
Summary: This work presents a time-varying, non-reciprocal, reconfigurable metasurface and demonstrates its active switching control on subwavelength waveguides operating at 13 MHz and 13.5 MHz. The dynamic reconfiguring capability offers versatile practical applications, overcoming the limitations of static passive metamaterials.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Xiaohu Wu, Mahmoud Nafe, Alejandro Alvarez Melcon, Juan Sebastian Gomez-Diaz, Xiaoguang Liu
Summary: This novel frequency reconfigurable microstrip non-reciprocal bandpass filter utilizes time-modulated microstrip λ(g)/2 resonators for frequency tuning. With the wideband isolation scheme, the device can be tuned over a wide frequency range while achieving low insertion loss.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2021)
Article
Physics, Applied
Wen Cheng, Gengkai Hu
Summary: This study demonstrates the extraordinary ability of the Willis material model in characterizing complex acoustic and elastic wave phenomena of metamaterials within non-Hermitian acoustic systems. The findings provide valuable insights for the design and exploration of wave phenomena in these systems.
APPLIED PHYSICS LETTERS
(2022)
Article
Computer Science, Information Systems
Minh Quang Dinh, Minh Thuy Le
Summary: In this work, the authors propose using time-modulation in metallic materials as a coupling mechanism between radiation and surface plasmon polaritons (SPP) without the need for optical components. They demonstrate the coupling through simulations and show that it can be actively controlled via strength and frequency modulation.
Article
Physics, Multidisciplinary
Jin Jiang-Ming, Xie Tian-Wei, Cheng Hao, Xiao Yue-Peng, D. Michael McFarland, Lu Huan-Cai
Summary: This article reports an experimental study of the nonreciprocal transmission of acoustic energy in an experimental system. By using a nonlinear membrane and two acoustic cavities of different sizes, the nonreciprocal transmission of acoustic energy is achieved through the asymmetry of the frequency response function. The experimental results show a significant nonreciprocal quantity and frequency bandwidth in the system.
ACTA PHYSICA SINICA
(2022)
Article
Engineering, Environmental
Bing Wang, Tianwen Xin, Lang Shen, Kun Zhang, Dan Zhang, Hui Zhang, Jisheng Liu, Bing Chen, Wenguo Cui, Yilai Shu
Summary: The GelMA-TA double-cross-linked hydrogel acoustic transmitted electrospun fibrous membrane, constructed with Tannic acid and Gelatin methacryloyl, shows excellent acoustic effects and mechanical properties, promoting tympanic membrane regeneration and facilitating faster healing to form a structure similar to the natural TM. By adjusting the concentration of Tannic acid, the sound response sensitivity can be improved and sound loss reduced.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Xingqiao Chen, Jianfa Zhang, Chunchao Wen, Ken Liu, Zhihong Zhu, Shiqiao Qin, Xiaodong Yuan
Summary: This paper proposed an optical nonlinear metasurface based on monolayer graphene integrated silicon resonant gratings, which can excite high-Q guided mode resonances in the communication band and achieve significant optical Kerr effect. By changing the parameters of the grating, the nonlinear effect can be effectively controlled to realize different applications. Furthermore, remarkable non-reciprocity phenomenon is realized at a certain incident intensity, allowing the implementation of an optical diode.
Article
Multidisciplinary Sciences
Anis Maddi, Come Olivier, Gaelle Poignand, Guillaume Penelet, Vincent Pagneux, Yves Auregan
Summary: The authors present an efficient and nonreciprocal absorber for controlling sound based on thermoacoustic effect, which overcomes the limitations of conventional methods, especially at low frequencies.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Hooman Barati Sedeh, Hediyeh Mohammadi Dinani, Hossein Mosallaei
Summary: This paper demonstrates the possibility of achieving nonreciprocal responses in the near-infrared regime using a combination of time-modulated metasurfaces and static high-Q metasurgeries. The effects of operating wavelength and modulation frequency on power isolation level are investigated, with results showing that the isolation level can reach -30 dB.
Article
Optics
Claire Baum, Matt Jaffe, Lukas Palm, Aishwarya Kumar, Jonathan Simon
Summary: Light is an excellent medium for both classical and quantum information transmission due to its speed and manipulability. Space-division multiplexing is gaining attention as a means to increase information transfer rate using infinite-dimensional propagation eigenmodes. In this work, controlling the optical susceptibility of an atomic sample is demonstrated as a powerful tool for manipulating the degrees of freedom of light. Photonic mode conversion between Laguerre-Gaussian modes with high efficiency is achieved by spatiotemporally modulating the optical susceptibility of the atomic sample.
Article
Nanoscience & Nanotechnology
Sajjad Taravati, George Eleftheriades
Summary: This paper discusses the unique functionalities of microwave space-time-modulated metasurfaces, including spatiotemporal decomposition, digital coding, and nonreciprocal transmission, which far exceed the capabilities of traditional metasurfaces.
Article
Multidisciplinary Sciences
Michel Fruchart, Ryo Hanai, Peter B. Littlewood, Vincenzo Vitelli
Summary: The article discusses the impact of non-reciprocity on the collective behavior of multi-body systems in out-of-equilibrium states, indicating that non-reciprocity leads to the emergence of time-dependent phases controlled by exceptional points. The article describes the non-reciprocal generalizations of three archetypal classes of self-organization out of equilibrium, including synchronization, flocking, and pattern formation.
Article
Materials Science, Multidisciplinary
Chen Shen, Charles Rohde, Colby W. W. Cushing, Junfei Li, Zheng Jie Tan, Huifeng Du, Xiuyuan Peng, Preston S. S. Wilson, Michael R. R. Haberman, Nicholas X. X. Fang, Steven A. A. Cummer
Summary: In this paper, a metamaterial with microlattice structures as the building blocks is proposed for underwater operations. By designing the building blocks and assembling them in a layered fashion, anisotropy is embedded in the structure, resulting in different effective sound speeds in orthogonal directions. Experimental results show that the proposed metamaterial performs well and provides an effective means for underwater sound control.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Chaoyu Sun, Ailing Song, Zhijun Liu, Yanxun Xiang, Fu-Zhen Xuan
Summary: The rapid development of topological physics has provided new methods for manipulating classic waves. Fano resonance, caused by the interference of resonance modes with different qualities, can be described by the temporal coupling mode theory. The design of an antisymmetric topological resonance state through the coupling between local resonance and Bragg scattering can reduce the periods of the phononic crystal. The research results have potential applications in non-destructive testing, radio-frequency filters, resonators, and sensors.
Editorial Material
Physics, Multidisciplinary
Taehwa Lee, Chen Shen, Qingbo He
FRONTIERS IN PHYSICS
(2023)
Article
Physics, Applied
Lu Shen, Junfei Tai, Alexandru Crivoi, Junfei Li, Steven Cummer, Zheng Fan
Summary: This paper investigates the mechanism of self-stabilizing, three-dimensional Mie particle manipulation in water via an acoustic tweezer with a single transducer. A carefully designed acoustic lens is attached to the transducer to form an acoustic vortex, which provides angular momentum on the trapped polymer sphere and leads to a fast-spinning motion. The spinning motion of the trapped sphere links the acoustic radiation force and hydrodynamic forces together, so that the sphere can spontaneously achieve new force balance and follow the translational motion of the acoustic tweezer. Non-spherical objects can also be manipulated by this acoustic tweezer.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Xuan-Bo Miao, Hao-Wen Dong, Sheng-Dong Zhao, Shi-Wang Fan, Guoliang Huang, Chen Shen, Yue-Sheng Wang
Summary: Unlike holography technique using active sound source arrays, metasurface-based holography can achieve high-quality holographic images with a single transducer, although it requires individually designed elements with unique modulation capabilities. This paper presents a deep-learning-aided inverse design approach for reconstructing megapixel images using an acoustic metasurface-based hologram with millions of elements. An iterative compensation algorithm is proposed to improve imaging quality by removing interference fringes and unclear details. Experimental validation using a 30x30 three-dimensional printed metasurface shows that sparse arrangement of elements can produce high-quality images even with fewer elements than the targeted image pixels.
APPLIED PHYSICS REVIEWS
(2023)
Review
Materials Science, Multidisciplinary
Ali Zabihi, Chadi Ellouzi, Chen Shen
Summary: The advent of acoustic metasurfaces (AMs) has enabled wave manipulation using thin structures with versatile capabilities such as steering, focusing, and absorption. This paper reviews recent developments in AMs and summarizes the approaches for achieving tunable control, including mechanical tuning, active control, and the use of field-responsive materials. The review provides an overview of basic concepts in each category, discusses their applications and performance, and concludes with future directions in this exciting field.
FRONTIERS IN MATERIALS
(2023)
Article
Acoustics
Jun Ji, Junfei Li, Steven A. Cummer, Yun Jing
Summary: There is a trade-off between the sparseness and sound absorption of an absorber array due to wave physics. This study demonstrates near-perfect absorption (99% absorption) when the spatial period of monopole-dipole resonators is close to one working wavelength (95% of the wavelength). Perfect absorption is achieved by making the monopole-dipole resonators critically coupled. Frequency domain simulations, eigenfrequency simulations, and coupled mode theory are used to explain the acoustic performances and underlying physics. The sparse-resonator-based sound absorber has the potential to greatly improve noise control with air flow and may also have implications for electromagnetic wave absorbers.
JASA EXPRESS LETTERS
(2023)
Article
Physics, Applied
Xiuyuan Peng, Junfei Li, Steven A. A. Cummer
Summary: In this study, we propose an ultra-broadband AEH and a highly efficient AEH that can convert sound energy into usable electrical power. Our broadband device is capable of converting 7.6% to 15.1% of total incident sound energy from 50 to 228 Hz, while the highly efficient AEH can achieve an energy conversion rate of 67% by replacing the loudspeaker surround with a lower-loss material. These designs offer cost-effective and scalable solutions for noise reduction and power generation.
APPLIED PHYSICS LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Jeffrey M. Chaffin, Yunjiao Pu, David M. Smith, Steve Cummer, Michael Splitt
Summary: We provide an updated analysis of a terrestrial gamma ray flash (TGF) detected by the Fermi Gamma ray Burst Monitor. The analysis confirms that the gamma ray signature is consistent with previous observations of upward-directed TGF events, suggesting that the observed gamma rays are actually the result of a reverse positron beam. The analysis also determines a lower limit on the luminosity of the downward TGF, making it detectable by the Fermi Gamma ray Burst Monitor.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Materials Science, Multidisciplinary
Olugbenga Gbidi, Chen Shen
Summary: Bound states in the continuum (BICs) are wave modes that remain localized and nonradiating in the continuous spectrum. This study demonstrates the manipulation of quasi-bound states (QBICs) in open resonators by introducing embedded scatters. Using microwave cavities and dielectric scatters, the quality factor of QBICs can be tuned, and selective excitation and suppression of specific QBIC modes can be achieved.
Article
Computer Science, Information Systems
Joshua S. Lloyd, Cole G. Ludwikowski, Cyrus Malik, Chen Shen
Summary: Voice assistants are widely used in audio consumer electronic products to facilitate human-machine interactions. However, they are vulnerable to inaudible attacks in the ultrasound range. This study demonstrates that a specially designed acoustic metamaterial filter can effectively mitigate such attacks by modulating the received signals. The filter, made of rigid plates with individual holes, exhibits local resonance phenomena to suppress incoming waves at specific frequencies. Experiments confirm the effectiveness of the filter in distorting attack signals and protecting smart speakers, without affecting normal audible signals. The small size and easy installation of the metamaterial filter make it suitable for various audio products, significantly enhancing the security of voice assistant devices.
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)
