High-efficiency anomalous reflection of acoustic waves with a passive-lossless metasurface

2019 ◽  
Vol 12 (4) ◽  
pp. 047003 ◽  
Author(s):  
Xing-Feng Zhu ◽  
Da-Jian Wu ◽  
Siu-Kit Lau ◽  
Xiao-Jun Liu
Keyword(s):  
Acoustic Waves ◽  
High Efficiency ◽  
Anomalous Reflection

Diffraction in phase gradient acoustic metagratings: multiple reflection and integer parity design

2021 ◽  
Vol 263 (3) ◽  
pp. 3167-3175
Author(s):  
Mohammad Uzair ◽  
Xiao Li ◽  
Yangyang Fu ◽  
Chen Shen
Keyword(s):  
Acoustic Waves ◽  
High Efficiency ◽  
Periodic Structures ◽  
Dominant Role ◽  
Underlying Mechanism ◽  
Multiple Reflections ◽  
Phase Gradient ◽  
Anomalous Reflection ◽  
Unit Cells ◽  
Diffraction Patterns

Diffraction occurs when acoustic waves are incident on periodic structures such as graded metasurfaces. While numerous interesting diffraction phenomena have been observed and demonstrated, the underlying mechanism of diffraction in these structures is often overlooked. Here we provide a generic explanation of diffraction in phase gradient acoustic metagratings and relate high-order diffractions to multiple reflections in the unit cells. As such, we reveal that the number of unit cells within the metagrating plays a dominant role in determining the diffraction patterns. It is also found that the integer parity of the metagrating leads to anomalous reflection and refraction with high efficiency. The theory is verified by numerical simulations and experiments on planar metagratings and provides a powerful mechanism to manipulate acoustic waves. We further extend the theory to cylindrical waveguides for the control of sound vortices via topological charge in azimuthal metagratings. The relevance of the theory in achieving asymmetric wave control and high absorption is also discussed and verified both numerically and experimentally.

Broadband, High‐Efficiency and Wide‐Incident‐Angle Anomalous Reflection in Groove Metagratings

2021 ◽  
pp. 2100149
Author(s):  
Chuanbao Liu ◽  
Jingjin He ◽  
Ji Zhou ◽  
Jianchun Xu ◽  
Ke Bi ◽  
...  
Keyword(s):  
High Efficiency ◽  
Incident Angle ◽  
Anomalous Reflection

High-efficiency generation of circularly polarized light via symmetry-induced anomalous reflection

2015 ◽  
Vol 91 (12) ◽  
Author(s):  
Shang-Chi Jiang ◽  
Xiang Xiong ◽  
Yuan-Sheng Hu ◽  
Sheng-Wei Jiang ◽  
Yu-Hui Hu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Anomalous Reflection

Rapid additive-free bacteria lysis using traveling surface acoustic waves in microfluidic channels

Lab on a Chip ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 4064-4070 ◽  
Author(s):  
Haiwei Lu ◽  
Kirk Mutafopulos ◽  
John A. Heyman ◽  
Pascal Spink ◽  
Liang Shen ◽  
...  
Keyword(s):  
Microfluidic Device ◽  
Acoustic Waves ◽  
High Efficiency ◽  
Surface Acoustic Waves ◽  
Microfluidic Channels ◽  
Wide Range

We introduce a microfluidic device that uses traveling surface acoustic waves to lyse bacteria with high efficiency. This lysis method should be applicable to a wide range of bacteria species and can be modified to analyze individual bacteria cells.

High-Efficiency Broadband Anomalous Reflection by Gradient Meta-Surfaces

Nano Letters ◽  
2012 ◽  
Vol 12 (12) ◽  
pp. 6223-6229 ◽  
Author(s):  
Shulin Sun ◽  
Kuang-Yu Yang ◽  
Chih-Ming Wang ◽  
Ta-Ko Juan ◽  
Wei Ting Chen ◽  
...  
Keyword(s):  
High Efficiency ◽  
Anomalous Reflection

scholarly journals Visible-Frequency Metasurfaces for Broadband Anomalous Reflection and High-Efficiency Spectrum Splitting

Nano Letters ◽  
2015 ◽  
Vol 15 (3) ◽  
pp. 1615-1621 ◽  
Author(s):  
Zhongyang Li ◽  
Edgar Palacios ◽  
Serkan Butun ◽  
Koray Aydin
Keyword(s):  
High Efficiency ◽  
Spectrum Splitting ◽  
Anomalous Reflection ◽  
Visible Frequency

scholarly journals Coiling-Up Space Metasurface for High-Efficient and Wide-angle Acoustic Wavefront Steering

2021 ◽  
Vol 8 ◽  
Author(s):  
Shuang Chen ◽  
Yuancheng Fan ◽  
Fan Yang ◽  
Kangyao Sun ◽  
Quanhong Fu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Structural Parameters ◽  
Space Structures ◽  
Destructive Interference ◽  
Diffraction Mode ◽  
Anomalous Reflection ◽  
Wide Range ◽  
High Efficient ◽  
Scattering Field ◽  
3D Printed

The recent advent of acoustic metasurface displays tremendous potential with their unique and flexible capabilities of wavefront manipulations. In this paper, we propose an acoustic metagrating made of binary coiling-up space structures to coherently control the acoustic wavefront steering. The acoustic wave steering is based on the in-plane coherent modulation of waves in different diffraction channels. The acoustic metagrating structure with a subwavelength thickness is realized with 3D printed two coiling-up space metaunits. By adjusting structural parameters of the metaunits, the −1st-order diffraction mode can be retained, and the rest of the diffraction orders are eliminated as much as possible through destructive interference, forming a high-efficiency anomalous reflection in the scattering field. The anomalous reflection performance of the designed metagrating is achieved over a wide range of incident angles with high efficiency.

Broadband low-frequency acoustic absorber based on a metaporous composite

2022 ◽  
Author(s):  
Jia-Hao Xu ◽  
Xing-Feng Zhu ◽  
Di-Chao Chen ◽  
Qi Wei ◽  
Da-Jian Wu
Keyword(s):  
Acoustic Waves ◽  
High Efficiency ◽  
Low Frequency ◽  
Frequency Noise ◽  
Sound Waves ◽  
Broadband Absorption ◽  
Trapped Mode ◽  
Potential Applications ◽  
Simulation And Experiment ◽  
Interest In Research

Abstract Broadband absorption of low-frequency sound waves via a deep subwavelength structure is of great and ongoing interest in research and engineering. Here, we numerically and experimentally present a design of a broadband low-frequency absorber based on an acoustic metaporous composite (AMC). The AMC absorber is constructed by embedding a single metamaterial resonator into a porous layer. The finite element simulations show that a high absorption (absorptance A > 0.8) can be achieved within a broad frequency range (from 290 Hz to 1074 Hz), while the thickness of AMC is 1/13 of the corresponding wavelength at 290 Hz. The broadband and high-efficiency performances of the absorber are attributed to the coupling between the two resonant absorptions and the trapped mode. A good agreement between the numerical simulation and experiment is obtained. Moreover, the high broadband absorption can be maintained under random incident acoustic waves. The proposed absorber provides potential applications in low-frequency noise reduction especially when limited space is demanded.

Sign in / Sign up

Export Citation Format

Share Document