Article
Materials Science, Multidisciplinary
Yongqiang Kang, Jianguo Zhang, Hongmei Liu, Yun He, Jing Zhang
Summary: A tunable dual-band metamaterial absorber consisting of a gold square ring and a metal film separated by a strontium titanate dielectric was investigated. Two resonance peaks with over 99% absorbance were achieved at room temperature. The proposed absorber can be easily manufactured and extended to other frequencies for various applications.
RESULTS IN PHYSICS
(2021)
Article
Multidisciplinary Sciences
Xindong Zhou, Xiaochen Wang, Fengxian Xin
Summary: In this research, an ultrathin acoustic metamaterial composed of space-coiled water channels with a rubber coating is proposed for underwater sound absorption. The proposed metamaterial achieves perfect sound absorption at 181 Hz with a deep subwavelength thickness. The introduction of a rubber coating leads to slow-sound propagation, which is crucial for achieving perfect low-frequency sound absorption.Parametric studies are conducted to investigate the effects of specific structural and material parameters on sound absorption. By tailoring key geometric parameters, an ultra-broadband underwater sound absorber is constructed, paving a new way for designing underwater acoustic metamaterials and controlling underwater acoustic waves.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Applied
Zhenqian Xiao, Penglin Gao, Xiao He, Yegao Qu, Linzhi Wu
Summary: We propose a ventilated soundproof acoustic metamaterial consisting of resonant cavities arranged around a central air passage, achieving strong sound insulation performance. The metamaterial allows for direct control of sound transmission by rotating the opening, providing a new degree of freedom for sound control. The results may inspire further exploration of sound barriers and multifunctional applications in noise reduction and acoustic circuits.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Mechanical
Lea Sirota, Daniel Sabsovich, Yoav Lahini, Roni Ilan, Yair Shokef
Summary: The study introduces the concept of a feedback-based topological acoustic metamaterial for autonomously guiding sound beams along arbitrary curved paths in free two-dimensional space. By creating a desired dispersion profile in closed-loop, the metamaterial can exhibit analogies of quantum topological wave phenomena, enabling unconventional and robust sound beam guiding. The feedback-based design allows for arbitrary physical interactions in the metamaterial, paving the way for unconventional acoustic wave guiding on the same reprogrammable platform.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Acoustics
Zhe Zhang, Xinying Wang, Zhong Yuan Liu, Qiang Fan, Tian Ran Lin
Summary: This paper presents a new design of a perforated plate-type acoustic metamaterial (PAM) that can achieve designated sound insulation while allowing air ventilation and avoiding the influence of membrane pre-tension. The study analyzes the sound insulation mechanism of a typical perforated membrane-type acoustic metamaterial and confirms that the sound transmission loss peaks are due to strong wave interference. An impedance analysis using an electro-acoustic analogy further explores the sound insulation mechanism and validates the strong sound interference as the cause of the peaks. Experimental tests and finite element simulations show that the new perforated PAM design can provide good broadband sound transmission loss at low frequencies, and a practical application in reducing noise propagation from a commercial refrigerator's compressor compartment demonstrates the effectiveness of the design in terms of sound reduction and air ventilation.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
He Xu, Deyi Kong
Summary: Tunable acoustic properties of a wideband thin-film absorber based on acoustic metamaterial theory are achieved. The absorber is composed of a piezoelectric frame and flexible films with attached mass blocks. By establishing a cellular model of local resonance and exploring the properties of negative effective mass, the absorber's acoustic characteristics under alternating voltage excitation are studied using finite element and experimental methods. The results show that the absorber can effectively absorb sound waves through membrane-cavity coupling resonance, and the absorption can be further enhanced by exciting the mass-spring vibration system with an alternating voltage.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Engineering, Mechanical
Weitao Zhang, Xuewei Liu, Fengxian Xin
Summary: This study investigates the sound absorption performance of acoustic labyrinthine porous metamaterials at high temperature. The proposed metamaterial, constructed with metal-fibers-based porous matrix and folded slits, exhibits excellent subwavelength absorption due to the pressure diffusion effect. The theoretical model based on the double porosity theory and temperature-dependent parameters is validated by numerical simulations. The results show that the peak frequency of the metamaterial shifts to higher frequencies and the half-absorption bandwidth becomes wider as the temperature increases. The pressure diffusion effect plays a crucial role in suppressing the propagation of long-wavelength sound waves at high temperature. Moreover, the motion of air particles and energy dissipation density increase as the temperature rises, resulting in enhanced sound absorption. The proposed porous metamaterials show promising applications in low-frequency sound absorption at high temperature.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Mingxin Xu, William S. Harley, Zhichao Ma, Peter V. S. Lee, David J. Collins
Summary: Acoustic metasurfaces with complex 3D structures complicate their fabrication and applicability to higher frequencies, but an ultrathin metasurface approach utilizing planarized micropillars in a discretized phase array is demonstrated here. This subwavelength metasurface can be easily produced via a single-step etching process and is suitable for megahertz-scale applications. The flexibility of this approach is further demonstrated in the production of complex acoustic patterns via acoustic holography. This metasurface approach, combined with predictive models, has broad potential for robust, high-frequency acoustic manipulation in various applications.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Mingyu Duan, Chenlei Yu, Fengxian Xin, Tian Jian Lu
Summary: We propose a deep subwavelength acoustic metamaterial for low-frequency underwater sound absorption. It consists of a perforated facesheet, a fluid-filled square honeycomb core with inside rubber coating, and a fixed backsheet. A theoretical model is established to predict the sound absorption performance of this hybrid metamaterial based on the sound absorption theory and electro-acoustic analogy. The model agrees well with finite element simulation, showing perfect sound absorption at 375 Hz with a thickness of only 1/80 of the sound wavelength.
Article
Optics
Jose Manuel Luque-Gonzalez, Alejandro Ortega-Monux, Robert Halir, Jens H. Schmid, Pavel Cheben, Inigo Molina-Fernandez, J. Gonzalo Wanguemert-Perez
Summary: Integrated metamaterials are enhancing the performance of silicon photonic chips, but achieving them at telecom wavelengths requires very high fabrication resolution. Proposed subwavelength grating metamaterials show promising control over dispersion and anisotropy, allowing for high-performance on-chip devices like beam-splitters.
LASER & PHOTONICS REVIEWS
(2021)
Article
Acoustics
Golakoti Pavan, Sneha Singh
Summary: This paper presents a new Porous Labyrinthine Acoustic Metamaterial (PLAM) that achieves near-perfect sound absorption at low frequencies through a folded slit labyrinthine structure in a micro-porous matrix. The research provides a new approach for designing labyrinthine metamaterials with broader sound absorption range for aerodynamic noise control applications.
Article
Materials Science, Multidisciplinary
Jun Zhu, Changsong Wu, Yihong Ren
Summary: The study proposed a metamaterial absorber composed of graphene, and demonstrated that dynamic tuning of the absorption range and absorption bandwidth could be achieved by adjusting the Fermi level of the graphene. This has theoretical and engineering significance in the domains of thermal photo-voltaics, solar cells, and sensors.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Khwanchai Tantiwanichapan, Habibe Durmaz
Summary: The article introduces the use of THz plasmonics and subwavelength scale artificial structures to detect residual herbicides/pesticides. Experimental results show that the THz MMA platform can detect herbicides/pesticides down to 5 ppm. This suggests that the THz MMA platform could be an important method for highly sensitive THz applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
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
Physics, Applied
Santosh Dasila, Chitti Venkata Krishnamurthy, V. Subramanian
Summary: A miniaturized, broadband absorber with high absorption rate (> 95%) has been proposed and constructed, using quarter-wavelength resonator tubes as rectangular meta-atoms. The study presents the basic theoretical aspects, numerical simulations, fabrication process, and experimental validation of the absorber. The use of simple, fabrication-friendly meta-atoms allows for greater spatial coverage by tiling over large surfaces.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Zoology
A. Staniewicz, S. Foggett, G. McCabe, M. Holderied
Summary: Threatened crocodilians are difficult to observe in the wild, but a study on the acoustic communication of the rare Tomistoma schlegelii provides insights into their behavior. The species uses underwater acoustic signals during courtship and mating, with little vocal activity outside of those events.
BIOACOUSTICS-THE INTERNATIONAL JOURNAL OF ANIMAL SOUND AND ITS RECORDING
(2022)
Article
Multidisciplinary Sciences
Nikita M. Finger, Marc Holderied, David S. Jacobs
Summary: Low frequency pulses in high duty cycle bats increase detection distance in open environments. Source level has a greater impact on detection distance than frequency.
Article
Multidisciplinary Sciences
Jie Zhang, Xudong Niu, Anthony J. Croxford, Bruce W. Drinkwater
Summary: This paper explores possible strategies for continuous non-destructive monitoring of large-scale structures using a collection of inspection robots. The robots use guided ultrasonic waves to detect and locate defects. Monte Carlo simulations reveal the compromise between the number of robots and defect location accuracy.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Acoustics
Alexander R. K. Towlson, Anthony J. Croxford, Bruce W. Drinkwater
Summary: This article explores the use of a 40-kHz air-coupled ultrasonic array in detecting and imaging blockages and defects in buried pipes with 17-26 wavelengths in diameter at short ranges. The study finds that even low numbers of transducers (<25) are capable of producing accurate contours of blockages, but this restricts the resolving power. Arrays with more transducers ultimately image better by having greater density, resulting in improved contrast. Additionally, the interference between direct reflections and reflections via the pipe wall creates a low-amplitude band in all images of planar objects.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Multidisciplinary Sciences
Jin Li, William D. Jamieson, Pantelitsa Dimitriou, Wen Xu, Paul Rohde, Boris Martinac, Matthew Baker, Bruce W. Drinkwater, Oliver K. Castell, David A. Barrow
Summary: Engineering micro-emulsion is crucial for creating bottom-up synthetic cells. In this study, a droplet laboratory platform using microfluidics and acoustic levitation was developed to control membrane protein gating in functional artificial cells. The platform allows the engineering of complex emulsion-based, multicompartment artificial cells and offers the possibility of non-contact control of membrane protein function.
NATURE COMMUNICATIONS
(2022)
Article
Acoustics
Andrew Di Battista, Adam Price, Rob Malkin, Bruce W. Drinkwater, Paula Kuberka, Christopher Jarrold
Summary: This study examined the effects of short-term exposure to high-intensity airborne ultrasound on cognitive function. The results indicated that ultrasound exposure had no detectable impact on performance in the cognitive tasks.
Article
Clinical Neurology
Benjamin Clennell, Tom G. J. Steward, Kaliya Hanman, Tom Needham, Janette Benachour, Mark Jepson, Meg Elley, Nathan Halford, Kate Heesom, Eunju Shin, Elek Molnar, Bruce W. Drinkwater, Daniel J. Whitcomb
Summary: This study reveals the regulation of neuronal excitability and synaptic function by ultrasound stimulation. Ultrasound stimulation can increase whole-cell potassium currents and excitatory synaptic transmission. Activation of ionotropic glutamate receptors is required for ultrasound-induced modulation of neuronal potassium currents. These findings have important implications for the application of ultrasound stimulation in experimental and therapeutic settings, but further research is needed to understand the underlying molecular mechanisms.
Article
Zoology
Isabella Mandl, Naina Rabemananjara, Marc Holderied, Christoph Schwitzer
Summary: The fragmentation of forest habitat leads to an increase in edge areas, which affects the habitat use and behavior of animals living in the edge areas and core forests. However, this study found that edge effects have little impact on the Sahamalaza sportive lemur, as long as the vegetation structure remains unaffected.
INTERNATIONAL JOURNAL OF PRIMATOLOGY
(2023)
Article
Materials Science, Characterization & Testing
Xudong Niu, Jie Zhang, Anthony Croxford, Bruce Drinkwater
Summary: This study explores how to accurately simulate the elastodynamic scattering behavior of an arbitrary defect using finite element analysis. The method involves measuring the scattered wave field and decomposing it into multi-modal far-field scattering amplitudes to determine the angular order of scattering. The results show that this approach allows for more efficient modeling of guided wave scattering and contributes to a better understanding of experimental defect characterization.
NONDESTRUCTIVE TESTING AND EVALUATION
(2023)
Article
Zoology
Daniel Hending, Heriniaina Randrianarison, Niaina Nirina Mahefa Andriamavosoloarisoa, Christina Ranohatra-Hending, James Sedera Solofondranohatra, Haja Roger Tongasoa, Daniel Hending, Heriniaina Randrianarison, Niaina Nirina Mahefa Andriamavosoloarisoa, Christina Ranohatra-Hending, James Sedera Solofondranohatra, Haja Roger Tongasoa, Herinirina Tahina Ranarison, Victoria Gehrke, Natacha Andrianirina, Marc Holderied, Grainne McCabe, Sam Cotton
Summary: The encounter rates of dwarf lemurs in northwest Madagascar vary between wet and dry seasons, with higher rates during the wet season and lower rates from May to August. These findings provide some insight into the hibernation patterns of dwarf lemurs in Sahamalaza-Iles Radama National Park.
INTERNATIONAL JOURNAL OF PRIMATOLOGY
(2023)
Correction
Zoology
Daniel Hending, Heriniaina Randrianarison, Niaina Nirina Mahefa Andriamavosoloarisoa, Christina Ranohatra-Hending, James Sedera Solofondranohatra, Haja Roger Tongasoa, Herinirina Tahina Ranarison, Victoria Gehrke, Natacha Andrianirina, Marc Holderied, Grainne McCabe, Sam Cotton
INTERNATIONAL JOURNAL OF PRIMATOLOGY
(2023)
Review
Chemistry, Multidisciplinary
Chengying Yin, Xingyu Jiang, Stephen Mann, Liangfei Tian, Bruce W. Drinkwater
Summary: The high throughput deposition of microscale objects with precise spatial arrangement is crucial in microfabrication technology. The utilization of dynamic acoustic fields offers a contactless approach to real-time reconfigurable miniaturized systems, with potential applications in various fields. This article discusses the physical interactions of microscale objects in an acoustic pressure field, the fabrication of acoustic trapping devices, methods to tune the spatial arrangement, and potential applications in different disciplines.
Article
Acoustics
Zubeir M. Ebrahim Saib, Anthony J. Croxford, Bruce W. Drinkwater
Summary: This paper proposes a numerical model using FDTD scheme to solve the nonlinear elastic bulk wave equations, aiming to better understand nonlinear ultrasonic techniques. The model considers material and geometrical nonlinearities and uses a stress-type boundary condition for excitation. Simulation and experimental results validate the effectiveness of the model.
Article
Acoustics
Zubeir M. Ebrahim Saib, Anthony J. Croxford, Bruce W. Drinkwater
Summary: This paper investigates the effect of the excitation envelope on the generated nonlinear resonant signal for shear and longitudinal wave collinear wave mixing. It explores how to accurately extract the absolute material nonlinearity from any enveloped sinusoidal excitation signal. Experimental results show that Hanning windowed tone burst inputs have lower variance and are suitable for measuring the absolute nonlinearity parameter.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
