Article
Physics, Applied
Aibibula Abudula, Zhijun Sun
Summary: This report presents a metallic grating-incorporated Fabry-Perot cavity structure that exhibits asymmetric optical transmission (AOT) regardless of transmission modes. The asymmetric transmission is mainly attributed to the asymmetric coupling and decoupling of resonant surface plasmons (SPs) on both sides of the metallic grating with asymmetric media of different refractive indices. Additionally, by coupling the SP mode with the anti-resonance mode of the F-P cavity in orthogonal directions, the transmission characteristics of the structure for asymmetric transmission are further optimized, leading to a high contrast AOT achieved by locating the SP resonance position at the center of the anti-resonance band of the F-P cavity.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Acoustics
Ahmad Yusuf Ismail, Jisan Kim, Se-Myong Chang, Bonyong Koo
Summary: This paper presents a study on the impact of Helmholtz resonator-based acoustic metasurface on sound transmission loss. By optimizing the design variables of the metasurface, such as the number of cells, thickness, and multilayering, the noise reduction performance of the system can be improved. Experimental validation and numerical results demonstrate the effectiveness of the proposed design.
Article
Acoustics
Mingyang Zheng, Chao Chen, Xiaodong Li
Summary: Restricted by resonance principle, Helmholtz resonators can only effectively absorb noise near the resonance frequency. Coupling multiple resonators is an effective way to broaden the absorption band. In this study, numerical simulations and experiments are conducted to investigate the influence of grazing flow and sound incident direction on the acoustic performance. The results show that grazing flow weakens noise suppression ability and alters the acoustic characteristics of the system, while changing the sound incidence direction can mitigate the negative impact.
Article
Mathematics, Applied
Jianli Xiang, Guanghui Hu
Summary: We investigate the inverse diffraction problems for penetrable gratings in a piecewise constant medium. In the TE polarization case, we prove that the rectangular grating profile and the refractive index beneath it can be uniquely determined by the near-field observation data incited by a single plane wave and measured on a line segment above the grating. Our approach relies on the expansion of solutions to the Helmholtz equation and the corner singularity analysis of solutions to the inhomogeneous Laplace equation with a piecewise continuous source term in a sector. Furthermore, this paper contributes to corner scattering theory for the Helmholtz equation in a special non-convex domain.
Article
Acoustics
Xiao-Ling Gai, Xi-Wen Guan, Ze-Nong Cai, Xian-Hui Li, Wen-Cheng Hu, Tuo Xing, Fang Wang
Summary: This paper proposes a honeycomb-like sandwich acoustic metamaterial that can effectively control low-frequency noise. By establishing finite element models and analyzing the effects of different parameters, the role of Helmholtz resonators in transmission loss is studied. Experimental results confirm the excellent sound insulation performance of this acoustic metamaterial.
Article
Acoustics
F. Langfeldt, A. J. Khatokar, W. Gleine
Summary: This paper investigates a new approach for improving the bandwidth of plate-type acoustic metamaterials (PAM) by using Helmholtz resonators. By adding Helmholtz resonators to PAM, the bandwidth of sound transmission loss can be increased without significant reductions in sound transmission loss.
Article
Engineering, Electrical & Electronic
Shereena Joseph, Swagato Sarkar, Joby Joseph
Summary: Resonant modes in a low contrast grating-waveguide structure exhibit unique characteristics and high sensitivity, with potential applications in environmental index monitoring. Experimental observations show that the cavity mode in particular is remarkably sensitive, while the guided mode is negligibly sensitive and can serve as a reference line for sensing experiments.
IEEE SENSORS JOURNAL
(2022)
Article
Physics, Applied
Guanghua Wu, Zhaoyu Li, Meng Tao
Summary: A new strategy for enhancing sound transmission in a waveguide with a narrow slit is proposed using near-zero metamaterials to manipulate the air's effective mass density. The results from simulations and experiments demonstrate the effectiveness and robustness of this strategy. Additionally, Fabry-Perot-like resonances in the metamaterials-slit system lead to a gain effect for sound transmission, suggesting potential applications in acoustic sensing and cloaking.
APPLIED PHYSICS EXPRESS
(2022)
Article
Chemistry, Multidisciplinary
Wei Zhao, Yuting Liu, Xiandong Liu, Yingchun Shan, Xiaojun Hu
Summary: This study examines the impact of tire acoustic cavity resonance on vehicle interior noise, analyzes the influence of wheel design on vibration energy transmission characteristics, and constructs finite element models to verify modal properties through experimental tests. A sound pressure load model for the rim arising from tire acoustic cavity resonance is introduced. The power flow method is used to investigate resonance energy distribution and transmission characteristics, as well as analyzing structure intensity distribution, energy transmission efficiency, material structure damping, and the number of wheel spokes on energy transmission.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Hyeonbin Ryoo, Wonju Jeon
Summary: A thin acoustic metasurface is proposed for broadband absorption of low-frequency sound using hybrid resonances at multiple target frequencies, achieving lower Q-factors compared to existing absorbing structures. The design procedures allow for perfect sound absorption at multiple target frequencies, opening possibilities for practical applications in noise mitigation of various mechanical systems.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Multidisciplinary
Tinggui Chen, Wenting Li, Dejie Yu
Summary: This paper proposes a graded reflection acoustic grating metamaterials (GRAGM) to broaden the working bandwidth and reduce device volume. By changing the slit width, GRAGM combines multiple resonant bands to broaden the working band. It is capable of working in a deep subwavelength scale and has strong directional response for sound source localization. These properties offer potential applications in sound source localization, condition monitoring, and remote whispering.
Article
Acoustics
Yue Bao, Xiandong Liu, Wei Zhao, Jintao Luo, Yingchun Shan, Tian He
Summary: This paper adopts the reduction method of installing Helmholtz resonator (HR) group inside a lightweight aluminum alloy wheel to effectively reduce the Tire Acoustic Cavity Resonance (TACR) noise generated by rotating tires. The frequency bands of TACR noise are determined through theoretical analysis and experimental validation, and HR group consisting of 5 different sizes is designed and tested. The results show a remarkable reduction in TACR noise at the peak and specified frequency range, and the performance of the assembly is stable and reliable under various road and speed conditions. This study provides a comprehensive and feasible process strategy for the development of noise-reducing wheels.
Article
Optics
Zizheng Li, Lei Fan, Hongchao Zhao, Yong Yan, Jinbo Gao
Summary: This paper proposes a new type of metal-insulator-metal (MIM) hybrid cavity compound grating micro-structure array that achieves dual narrowband super-absorption in the near-infrared window. The study explores the modulation of optical characteristics through the coupling and hybridization effects of surface plasmon polaritons. Furthermore, it investigates the unique properties and applications of the structure, providing insights for the development and usage of surface plasmon superabsorbers.
Article
Acoustics
Liangfen Du, Abhishek Saini, Zeqing Sun, Jian Chen, Zheng Fan
Summary: Acoustic focusing has broad applications, but traditional structures have fabrication difficulties and energy transmission limitations. This study proposes a double layered acoustic grating (DLAG) to achieve high energy transmission efficiency through optimized geometry for acoustic focusing.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
Colin Gough
Summary: This article describes the use of internal cavity sound measurements to characterize the acoustic properties of any hollow-bodied string instrument, using the violin family as an example. It illustrates how excited vibrations of the body shell can excite a rich spectrum of internal cavity resonances, which are strongly correlated with radiated sound, particularly in the lower frequency ranges.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Physics, Applied
Xue-Yi Zhu, Ye-Long Xu, Yi Zou, Xiao-Chen Sun, Cheng He, Ming-Hui Lu, Xiao-Ping Liu, Yan-Feng Chen
APPLIED PHYSICS LETTERS
(2016)
Article
Physics, Applied
Cheng He, Zheng Li, Xu Ni, Xiao-Chen Sun, Si-Yuan Yu, Ming-Hui Lu, Xiao-Ping Liu, Yan-Feng Chen
APPLIED PHYSICS LETTERS
(2016)
Review
Engineering, Electrical & Electronic
Xiao-Chen Sun, Cheng He, Xiao-Ping Liu, Ming-Hui Lu, Shi-Ning Zhu, Yan-Feng Chen
PROGRESS IN QUANTUM ELECTRONICS
(2017)
Article
Optics
Xue-Yi Zhu, Samit Kumar Gupta, Xiao-Chen Sun, Cheng He, Gui-Xin Li, Jian-Hua Jiang, Xiao-Ping Liu, Ming-Hui Lu, Yan-Feng Chen
Article
Multidisciplinary Sciences
Si-Yuan Yu, Cheng He, Zhen Wang, Fu-Kang Liu, Xiao-Chen Sun, Zheng Li, Hai-Zhou Lu, Ming-Hui Lu, Xiao-Ping Liu, Yan-Feng Chen
NATURE COMMUNICATIONS
(2018)
Article
Multidisciplinary Sciences
Cheng He, Si-Yuan Yu, Hao Ge, Huaiqiang Wang, Yuan Tian, Haijun Zhang, Xiao-Chen Sun, Y. B. Chen, Jian Zhou, Ming-Hui Lu, Yan-Feng Chen
NATURE COMMUNICATIONS
(2018)
Article
Crystallography
Xiao-Chen Sun, Cheng He, Xiao-Ping Liu, Yi Zou, Ming-Hui Lu, Xiao Hu, Yan-Feng Chen
Article
Physics, Multidisciplinary
Cheng He, Si-Yuan Yu, Huaiqiang Wang, Hao Ge, Jiawei Ruan, Haijun Zhang, Ming-Hui Lu, Yan-Feng Chen
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
Cheng He, Hua-Shan Lai, Bo He, Si-Yuan Yu, Xiangyuan Xu, Ming-Hui Lu, Yan-Feng Chen
NATURE COMMUNICATIONS
(2020)
Article
Nanoscience & Nanotechnology
Hua-Shan Lai, Hao Chen, Bo He, Cheng He, Yan-Feng Chen
Article
Physics, Multidisciplinary
Chu-Hao Xia, Hua-Shan Lai, Xiao-Chen Sun, Cheng He, Yan-Feng Chen
Summary: In this study, higher-order hinge states in an acoustic topological Dirac semimetal were experimentally investigated, revealing the existence of robust nontrivial hinge arcs in addition to removable trivial surface states. The work also showed that a pair of hinges possess arcs located in complementary momentum regions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Ji-Qian Wang, Zi-Dong Zhang, Si-Yuan Yu, Hao Ge, Kang-Fu Liu, Tao Wu, Xiao-Chen Sun, Le Liu, Hua-Yang Chen, Cheng He, Ming-Hui Lu, Yan-Feng Chen
Summary: The authors provide experimental evidence for extended topological valley-locked states and propose their application in acoustics devices. By combining Dirac semimetals and topological insulators, they demonstrate reduced backscattering and improved matching of surface acoustic waves (SAWs) with interdigital transducers. Through the design and manufacturing of miniaturized phononic crystals on a semi-infinite substrate, they successfully realize valley-locked edge transport for SAWs. This work has important implications for future acoustic information processing, sensing, and manipulation.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Fei Liang, Cheng He, Dazhi Lu, Qiannan Fang, Yu Fu, Haohai Yu, Huaijin Zhang, Yan-Feng Chen
Summary: In this study, lasers far beyond the fluorescence spectrum were realized in Yb-doped YCa4O(BO3)(3) crystals. Selective amplification of three- to eight-phonon processes and suppression of fewer-phonon ones resulted in an overall spectral tunability of 1,110-1,465 nm. The enhancement of the weak electron-phonon-photon interaction holds significance and opens up new possibilities for on-demand lasers operating outside the fluorescence spectrum.
Article
Physics, Applied
Bo-Wen Li, Xiao-Chen Sun, Cheng He, Yan-Feng Chen
Summary: This study proposes a method to realize acoustic graphyne by introducing negative coupling to simulate the carbon-carbon triple bond, resulting in the transition from trivial to higher-order topological phases characterized by real Chern numbers. These topologically protected corner states are achieved in a finite-size sample, and the conditions for their existence are discussed. This research extends the concept of real Chern insulators and provides a platform for studying the topological properties of graphene-like structural compounds.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Yan-Chen Zhou, Hua-Shan Lai, Jian-Lan Xie, Xiao-Chen Sun, Cheng He, Yan-Feng Chen
Summary: Recently, higher-order states have been discovered, enriching the study of topological phases. These states allow for manipulation of wave propagation or localization in dimensions lower than the bulk. In a two-dimensional honeycomb lattice gyromagnetic photonic crystal, magnetic corner states have been realized by breaking time-reversal and parity symmetries. These states arise from the hybridization of two Wannier centers and can be controlled solely by adding or removing magnetic fields at the corner sites.
