Multi-frequency acoustic metasurface for extraordinary reflection and sound focusing

Zhu, Yifan; Fan, Xudong; Liang, Bin; Yang, Jing; Yang, Jun; Yin, Leilei; Cheng, Jianchun

doi:10.1063/1.4968607

Cited by 43 publications

(26 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reproduced under the terms of the Creative Commons Attribution (CC‐BY) license. [ 172 ] Copyright 2016, The Author(s), published by AIP Publishing. d) Ultracompact acoustic lens for near‐field and far‐field focusing.…”

Section: Applications Of Acoustic Metamaterialsmentioning

confidence: 99%

Acoustic Metamaterials: A Review of Theories, Structures, Fabrication Approaches, and Applications

Liao

Luan

Wang

et al. 2021

Adv Materials Technologies

128

View full text Add to dashboard Cite

Acoustic metamaterials (AMs), which are materials composed of subwavelength periodic artificial structures with specific designs, have drawn significant research attention. This is because of the extraordinary abilities of AMs to manipulate acoustic waves compared with those of traditional acoustic materials. In this review, current advances in AM research are comprehensively investigated and summarized. First, major theories regarding AMs, including the acoustic wave equation, crystal lattice and energy band theory, effective medium theory, and general Snell's law, are explained in detail. Existing AM structures are then described and divided into several categories based on their structural characteristics and responses to acoustic waves. Furthermore, to bridge the gap between design and practical application, both conventional and advanced AM manufacturing methods are summarized. The applications of AMs in the fields of acoustic cloaking, acoustic lensing, acoustic absorption, noise reduction, and supernormal sound transmission are particularly delineated. Finally, contemporary challenges, trends, and strategies relevant to AMs are discussed. This review aims to provide a comprehensive collection of AM‐related knowledge, including information regarding physical theories, structures, fabrication approaches, and applications, which will help promote the further development of AMs.

show abstract

Section: Applications Of Acoustic Metamaterialsmentioning

confidence: 99%

Acoustic Metamaterials: A Review of Theories, Structures, Fabrication Approaches, and Applications

Liao

Luan

Wang

et al. 2021

Adv Materials Technologies

128

View full text Add to dashboard Cite

show abstract

“…This class of metasurfaces exploits the so-called Generalized Snell's Law (GSL) 2,3 stating that the classic reflection and refraction angles of an incoming acoustic perturbation impinging on a surface can be modified (almost) at will introducing a graded phase delay over the surface. Previous researches show several practical ways to realize this effect, [4][5][6][7][8][9][10][11] achieving remarkable results in terms of subwavelength thickness and bandwidth of the devices. 12,13 However, if on one hand particular attention has been paid to the development of metasurfaces operating in media at rest, very little has been done to take into account convective effects.…”

Section: Introductionmentioning

confidence: 99%

On the integration of acoustic phase-gradient metasurfaces in aeronautics

Palma

Burghignoli

2020

International Journal of Aeroacoustics

View full text Add to dashboard Cite

Metamaterials might be one of the breakthrough technologies needed from the aeronautic industry to achieve the more and more challenging targets set by the international authorities, especially about noise emissions. In this article, a theoretical link between Transformation Acoustics and Generalized Snell’s Law, two widely used metamaterial models, is demonstrated analytically and applied to case studies. The relevance of the connection in the aeroacoustic field is discussed along with the consequent computational advantages for numerical simulations. This is exploited to perform a simulation-based design optimization of a phase-graded metasurface acoustic lining of a 2 D duct in presence of flow. Results show promising abilities of the optimized device to modify and control the directivity of the noise emitted from the duct by means of unconventional reflections. The noise reduction in the desired direction is obtained through constructive and destructive interference, with no absorption from the boundaries.

show abstract

“…Other approaches have also been successfully adopted to realize metamaterials with interesting properties, such as coiling up space by using labyrinthine structures to introduce local phase delay in sound propagation. The phase shift can be designed in the full 0-2π range to obtain flat surfaces to act as arbitrarily-shaped virtual surfaces [22][23][24], modifying the reflection angle, or it could be random to maximize acoustic diffusion [25,26] (Figure 1). Space-coiling metamaterials can be adopted to obtain lens-like behaviors or even to transform the propagation pattern from spherical to plane waves [27,28].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Metamaterials in Aeronautics

et al. 2018

View full text Add to dashboard Cite

Metamaterials, man-made composites that are scaled smaller than the wavelength, have demonstrated a huge potential for application in acoustics, allowing the production of sub-wavelength acoustic absorbers, acoustic invisibility, perfect acoustic mirrors and acoustic lenses for hyper focusing, and acoustic illusions and enabling new degrees of freedom in the control of the acoustic field. The zero, or even negative, refractive sound index of metamaterials offers possibilities for the control of acoustic patterns and sound at sub-wavelength scales. Despite the tremendous growth in research on acoustic metamaterials during the last decade, the potential of metamaterial-based technologies in aeronautics has still not been fully explored, and its utilization is still in its infancy. Thus, the principal concepts mentioned above could very well provide a means to develop devices that allow the mitigation of the impact of civil aviation noise on the community. This paper gives a review of the most relevant works on acoustic metamaterials, analyzing them for their potential applicability in aeronautics, and, in this process, identifying possible implementation areas and interesting metabehaviors. It also identifies some technical challenges and possible future directions for research with the goal of unveiling the potential of metamaterials technology in aeronautics.

show abstract

Multi-frequency acoustic metasurface for extraordinary reflection and sound focusing

Cited by 43 publications

References 24 publications

Acoustic Metamaterials: A Review of Theories, Structures, Fabrication Approaches, and Applications

Acoustic Metamaterials: A Review of Theories, Structures, Fabrication Approaches, and Applications

On the integration of acoustic phase-gradient metasurfaces in aeronautics

Acoustic Metamaterials in Aeronautics

Contact Info

Product

Resources

About