Article
Acoustics
Pyung-Sik Ma, Yun-Ho Seo, Hyung Jin Lee
Summary: In this study, space-coiling acoustic metamaterials were used to achieve multiband sound insulation for ventilation acoustic barriers. The effective refractive indices of internally curled channels were tuned to introduce multiple resonances, especially for low-frequency sound. The paper presents an analytical model of the proposed structure and its corresponding band structure, and demonstrates the suppression of acoustic wave transmission through the band-folding effect and local resonance. The effectiveness of the ventilation barrier in a diffuse field was confirmed through numerical simulations.
Article
Physics, Applied
Qiannan Wu, Haohao Chen, Yanyan Cao, Shan Zhu, Baoyin Sun, Yadong Xu
Summary: In this work, we designed and studied a dielectric phase-gradient metagrating (DPGM) with SiGe that enables negative refraction for incident light in the visible band. The wide incident angle range and broadband response from 400 nm to 470 nm are achieved due to tolerances in the metasurface design. An angularly asymmetric transmission phenomenon was observed in the designed DPGM, with the physical mechanism behind the phenomenon revealed. These results pave the way for achieving negative refraction in visible frequencies.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Zhiyuan Zhou, Xiao Wang
Summary: Negative refraction in multilayered metal-dielectric metamaterials can be achieved not only through negative refractive indices or hyperbolic-like isofrequency surfaces, but also by ellipse-like isofrequency surfaces. The phenomenon is theoretically demonstrated and verified through numerical simulation. The energy flow of ellipse-like modes in the layers is investigated and compared with that of hyperbolic-like modes. Moreover, negative double refraction is achieved by combining ellipse-like and hyperbolic-like isofrequency surfaces.
Article
Materials Science, Multidisciplinary
Zheren Cai, Shengdong Zhao, Zhandong Huang, Zheng Li, Meng Su, Zeying Zhang, Zhipeng Zhao, Yanlin Song
Summary: This paper verifies the negative refraction and acoustic imaging capacity of acoustic metamaterials composed of 2D underwater elastic shell encapsulated bubble arrays, and discusses the influence of thermoviscous loss and damping on imaging.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Optics
Yiwei Peng, Jie Sheng, Jianlan Xie, Junzhe Yu, Jianjun Liu
Summary: In this study, an ultratransparent medium with wide-angle negative refraction (NR) index is proposed, and the imaging with its flat lens is discussed through theoretical analysis and simulation verification. The photonic crystal (PC) designed as an instance of the medium can achieve NR within 50° and positive refraction (PR) within 75° with transmittances over 99%, making it an ideal material for multifunctional NR/PR devices with ultra-low loss.
Article
Physics, Multidisciplinary
Martin T. Hill
Summary: This study extends the concept of a compact optical switch based on moving a negative-index media (NIM) load to include waveguides carrying transverse magnetic (TM) modes. Simulations show that switching is possible for TM modes using current metamaterial NIM implementations.
Article
Materials Science, Multidisciplinary
Or Lasri, Lea Sirota
Summary: Negative refraction is a unique wave propagation phenomenon that occurs when a wave crosses a boundary between a regular medium and a medium with negative constitutive parameters at a given frequency. We propose a temporal analogue of this phenomenon by using time-dependent media and creating an artificial temporal boundary. By switching the parameters from constant to dispersive with frequency, we demonstrate both reflection and refraction in positive and negative regimes simultaneously. We show analytically and numerically that the dynamics of this temporal analogue are different from the spatial case, and that the temporal boundary can be made nonreflecting while preserving both positive and negative refraction through targeted dispersion tuning.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Yu Wu, Qiang Sun, Rongsheng Qiu, Zhongwei Yu, Yanyan Huang
Summary: The transmission characteristics of a sandwich composite structure containing hyperbolic metamaterials (HMMs) and graphene were investigated. Numerical results showed that high transmittance (greater than 0.9) within an ultra-wide incident angle range (0 - 68.1 degrees, 0 - 75.7 degrees) could be achieved by optimizing the chemical potential (& mu;c = 0.5, 0.6eV) for both s-polarized and p-polarized waves at a specific incident frequency (30THz). Moreover, appropriate choices of HMM thickness and graphene layers enabled transmission enhancement over a wide incident angle range.
RESULTS IN PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Yi Liu, Chunmei Ouyang, Quan Xu, Xiaoqiang Su, Jiajun Ma, Jing Zhao, Yanfeng Li, Zhen Tian, Jianqiang Gu, Liyuan Liu, Jiaguang Han, Weili Zhang
Summary: Hyperbolic metasurfaces exhibit rich dispersion engineering and topological transitions, enabling multi-directional topological transitions and surface plasmon polariton propagation, with the ability for new types of negative refraction, which will help overcome the diffraction limit.
Article
Physics, Applied
B. Meirbekova, L. Morini, M. Brun, G. Carta
Summary: In this paper, the phenomenon of negative reflection in a mechanical phononic structure is studied. The structure consists of fixed inclusions embedded in a linear elastic matrix. The negative reflection is not due to subwavelength metastructures or materials with negative mechanical properties. Numerical analyses demonstrate that there are frequencies at which most of the incident energy is reflected at negative angles. The effect is symmetric with respect to a line that is not parallel to the normal direction to the grating structure. Simulations and computations show that negative reflection is achievable in a wide range of loading conditions.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Anton Melnikov, Soeren Koeble, Severin Schweiger, Yan Kei Chiang, Steffen Marburg, David A. Powell
Summary: This study proposes a method of manipulating acoustic wavefronts using acoustic metagratings and manufactures microscopic acoustic metamaterials using two-photon polymerization. The impact of thermoviscous effects is considered in the design, and shape optimization techniques are used to develop meta-atoms insensitive to these effects.
Article
Materials Science, Multidisciplinary
Ya-jun Xin, Rui-ning Huang, Peng Li, Quan Qian, Qun Yan, Yong-tao Sun, Qian Ding, Yu-jie Huang, Shu-liang Cheng
Summary: This study focuses on the design of labyrinthine acoustic metamaterials and their potential applications in sound insulation and noise reduction. The physical mechanisms behind the transmission valleys and acoustic isolation peaks are analyzed, and an ultra-sparse distribution hypersurface is designed to achieve effective acoustic isolation and noise reduction at a specific frequency.
RESULTS IN PHYSICS
(2023)
Article
Engineering, Mechanical
Yufeng Zhou
Summary: This study simulates the acoustic and structural properties of labyrinthine acoustic metamaterials in a cascade configuration and finds that the separating distance and visco-thermal effects have significant impacts on the acoustic performance and absorption.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Li-Mei Xue, Yue-Jiao Wang, Xian-Jun Liu, Zhen-Jun Yang
Summary: In this study, the propagation characteristics of adjustable abnormal hollow beams in gradient negative refractive index material are investigated theoretically and numerically. The results show that the intensity pattern, beam width, and axial intensity of AAH beams can undergo various changes during propagation, and different transmission types can be observed.
RESULTS IN PHYSICS
(2022)
Article
Engineering, Marine
R. Porter, C. Marangos
Summary: This paper examines the propagation of plane incident waves over a long submerged uniform rectangular structured ridge protruding from the sea bed. It shows that negative refraction of obliquely-incident waves is possible if the barriers are sufficiently close to the surface. Additionally, it is found that the modulus of reflection and transmission coefficients are symmetric functions of the incident wave heading and the barrier orientation.
Article
Materials Science, Multidisciplinary
Chunyu Ren
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2015)
Article
Physics, Multidisciplinary
Qu Zhao-Liang, Ren Chun-Yu, Pei Yong-Mao, Fang Dai-Ning
Article
Physics, Applied
Weipeng Tang, Chunyu Ren, Shuaishuai Tong, Zixiang Zhou
APPLIED PHYSICS EXPRESS
(2018)
Article
Physics, Applied
Shuaishuai Tong, Chunyu Ren, Weipeng Tang
APPLIED PHYSICS EXPRESS
(2018)
Article
Physics, Applied
Weipeng Tang, Chunyu Ren, Shuaishuai Tong, Xichun Huang
APPLIED PHYSICS LETTERS
(2019)
Article
Physics, Applied
Shuaishuai Tong, Chunyu Ren, Jun Tao, Weipeng Tang
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Physics, Applied
Shuaishuai Tong, Chunyu Ren
APPLIED PHYSICS LETTERS
(2020)
Article
Physics, Applied
Shuaishuai Tong, Chunyu Ren, Weipeng Tang
Summary: An asymmetric sandwich-like material element is proposed for designing bianisotropic metasurface with full-angle high-efficiency anomalous refractive manipulation. Analytical demonstration shows that the sandwich-like structures can exhibit bianisotropic response and meet the impedance matching condition, and the design concept can be realized via space-coiling structures.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
Jun Tao, Shuaishuai Tong, Chunyu Ren
Summary: A design of enhanced directional emission (EDE) based on anisotropic metamaterial (MM) has been proposed in this study, which can achieve zero components of the effective density tensor and adjust the beam aperture by modifying the device shape. This proposed MM may have potential applications in acoustic antenna, acoustic cloak and noise control by discussing the influences of geometric parameters of microstructures on the working frequency.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
Shuaishuai Tong, Chunyu Ren, Jun Tao
Summary: This study proposes a specially designed acoustic waveguide that utilizes topological interface states to achieve enhanced directional radiation. By employing a leaky-wave design, the radiation resistance and efficiency of a point source can be improved. Experimental results demonstrate significant enhancement in acoustic directional radiation with more than ten times energy enhancement. This proposed strategy shows potential for subwavelength wave manipulation and has applications in acoustic communication, nondestructive evaluation, and biomedical imaging.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Shuaishuai Tong, Chunyu Ren, Jun Tao, Lixun Jiang
Summary: This paper presents a method for designing, realizing, and measuring a flattened focal surface underwater acoustic Luneburg lens. The lens is designed using the quasi-conformal transformation technique and constructed with metamaterials based on air-filled photosensitive resin. Numerical simulations and experimental studies demonstrate that the flattened lens has excellent focusing performance over a broad frequency band and can potentially be applied in biomedical imaging, underwater acoustic sensing, and communication.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Applied
Shuaishuai Tong, Chunyu Ren
Summary: This study presents the practical implementation of a 3D Luneburg lens for underwater sound by designing and fabricating 3D gradient face-centered-cubic phononic crystals using 3D printing. The experimental results demonstrate that the lens can achieve omnidirectional imaging of underwater sound. This 3D underwater acoustic Luneburg lens may have potential applications in underwater acoustic wide-angle retroreflectors, sonars, and biomedical imaging devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Weipeng Tang, Chunyu Ren
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2017)
Article
Physics, Applied
Weipeng Tang, Chunyu Ren
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2017)