Ultrathin skin cloaks with metasurfaces for audible sound

Zhai, Shilong; Chen, Huaijun; Ding, Changlin; Li, Linlin; Shen, Fangliang; Luo, Chunrong; Zhao, Xiaopeng

doi:10.1088/0022-3727/49/22/225302

Cited by 44 publications

(42 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, we also obtained the reflected ratios of these eight units, as shown with the black dots in Figure 2. Based on [24], the reflected ratio of the metamaterial with membrane is also low at the resonant frequency, but the reflected ratio will be very high once the frequency is away from the resonant frequency. Therefore, the resonant frequencies of the structural units in this work are not at the designed working frequency (i.e., 570 Hz).…”

Section: Design Of the Modelmentioning

confidence: 99%

“…Good agreements can be found between the simulated results and the calculated results. Although these eight units possessing strict /4 phase shifts are designed for the working frequency of 570 Hz, based on [24] we can know that the shifts between adjacent units still maintain approximately /4 even when the frequency changes near the working frequency. Therefore, the phenomenon of abnormal reflection can still be found, but the effect of abnormal reflection may slightly decline in quality.…”

Section: Abnormal Reflection Of the Metasurfacementioning

confidence: 99%

“…In the field of optics, the metasurfaces have developed to realize many remarkable functions, such as light beam steering [14], ultrathin optical skin cloak [15], and holograms [16]. As the wavelengths of sound waves are much larger than that of light wave, the acoustic metasurfaces [17][18][19][20][21][22][23][24] are especially important for acoustic devices. Faure et al realized an acoustic carpet cloaking by using a metasurface made of graded Helmholtz resonators [18].…”

Section: Introductionmentioning

confidence: 99%

“…Esfahlani et al designed a space-coiled cylindrical unit and generated acoustic vortices based on this passive acoustic metasurface [27]. Zhai et al [24] and Esfahlani et al [28], respectively, proposed an acoustic metasurface carpet cloak based on membrane-capped cavities. However, the proposed metasurfaces still face the limits of complicated structures, large dimensions, and high working frequencies.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Anomalous Reflection of Acoustic Waves in Air with Metasurfaces at Low Frequency

Chen

2018

Advances in Condensed Matter Physics

Self Cite

View full text Add to dashboard Cite

An acoustic metasurface made of a composite structure of cavity and membrane is proposed and numerically investigated. The target frequency is in the low frequency regime (570 Hz). The unit cells, which provide precise local phase modulation, are rather thin with thickness in the order around 1/5 of the working wavelength. The numerical simulations show that the designed metasurface can steer the reflected waves at will. By taking the advantage of this metasurface, an ultrathin planar acoustic axicon, acoustic lens, and acoustic nondiffracting Airy beam generator are realized. Our design method provides a new approach for the revolution of future acoustic devices.

show abstract

Section: Design Of the Modelmentioning

confidence: 99%

Section: Abnormal Reflection Of the Metasurfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Anomalous Reflection of Acoustic Waves in Air with Metasurfaces at Low Frequency

Chen

2018

Advances in Condensed Matter Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…22 Another type of acoustic metasurface is formed by membranes decorated with masses, which were used to realize simultaneous negative density and bulk modulus 23 and an acoustic perfect absorber. 24 A thin acoustic cloak was also proposed theoretically using membrane type metasurfaces 25,26 and was demonstrated by Helmholtz resonators with varying cavity volumes. 27 Up to date, the design of metasurfaces is typically assuming a continuous phase profile.…”

mentioning

confidence: 99%

A thin and conformal metasurface for illusion acoustics of rapidly changing profiles

Dubois

Shi

Wang

et al. 2017

Applied Physics Letters

View full text Add to dashboard Cite

Recently developed metasurfaces have been used for surface engineering applications. However, the ability to cloak or mimic reflective surfaces with a large in-plane phase gradient remains unexplored. One major challenge is that even with a small incidence angle, the strong acoustic impedance variation induced by the random height profile creates additional scattering and increases the complexity of the analysis and design of the metasurface. Here, we introduce an acoustic metasurface with 1/12 wavelength thickness to realize an acoustic carpet cloak for a randomly rapid-change surface and a virtual acoustic diffuser from a flat surface using a set of Helmholtz resonators. The limitation of the metasurface for large phase gradient application is explored based on a nonlocal model that considers the contributions from neighboring surface profiles. This study extends the integration of smart acoustic surface and may find applications of surface engineering such as in architectural acoustics.

show abstract

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

Liao

Luan

Wang

et al. 2021

Adv Materials Technologies

115

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

Ultrathin skin cloaks with metasurfaces for audible sound

Cited by 44 publications

References 33 publications

Anomalous Reflection of Acoustic Waves in Air with Metasurfaces at Low Frequency

Anomalous Reflection of Acoustic Waves in Air with Metasurfaces at Low Frequency

A thin and conformal metasurface for illusion acoustics of rapidly changing profiles

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

Contact Info

Product

Resources

About