Broadband Tunable Acoustic Asymmetric Focusing Lens from Dual-Layer Metasurfaces

Xia, Jianping; Zhang, Xiao-ting; Sun, Hong-xiang; Yuan, Shouqi; Qian, J.; Ge, Yong

doi:10.1103/physrevapplied.10.014016

Cited by 112 publications

(83 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Fig. 1a, the unit cell (with length l = λ /2 and width w = λ /10) consists of two symmetric Helmholtz resonator arrays and a straight channel 50 with a tunable width w 1 , where λ is the wavelength. The cavity width w 2 is determined by w 1 , and the other parameters l 1 = 0.03 l , l 2 = 0.225 l , w 3 = 0.05 w and w 2 = w − w 1 − 4 w 3 .…”

Section: Resultsmentioning

confidence: 99%

Binary-phase acoustic passive logic gates

Wang

Xia

Sun

et al. 2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

The recent rapid development of acoustic logic devices has opened up the possibilities of sound computing and information processing. However, simultaneous realization of acoustic logic devices with subwavelength size, broad bandwidth and passive structure still poses a great challenge. To overcome it, we propose a subwavelength acoustic logic gate which consists of binary-phase passive unit cells placed into a multi-port waveguide. Based on the phase manipulations of the unit cells, we experimentally and numerically realize three basic logic gates OR, NOT and AND, and a composite logic gate XOR with a uniform threshold of 0.4 Pa based on linear acoustic interferences. More importantly, We also design a composite logic gate XNOR by a four-port waveguide, and composite logic gates NOR and NAND and a logic operation A⊙(B+C) based on two logic gates. We demonstrate a 0.6λ-length, 0.3 λ- width, and 0.2-fractional bandwidth acoustic logic gate constructed by passive structures, which may lead to important advances in various applications, such as acoustic computing, acoustic information processing and integrated acoustics.

show abstract

Section: Resultsmentioning

confidence: 99%

Binary-phase acoustic passive logic gates

Wang

Xia

Sun

et al. 2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Typically, the design of a metasurface for anomalous reflection/refraction is based on the choice of an operating wavelength λ = λ 0 , that allows to define the constructive parameters of the surface itself, and the resulting effective bandwidth is typically narrow. Some authors investigated so far the off-design performance of their metadevices in the attempt to obtain broadband effectiveness [21][22][23] and explored also different design strategies, such as the use of pentamode metamaterials for modifying the local speed of sound [24], even with remarkable results. However, their advancements are not transferable to the design of a space-coiling broadband acoustic metasurface.…”

Section: Introductionmentioning

confidence: 99%

Steering of Acoustic Reflection from Metasurfaces through Numerical Optimization

Palma

Centracchio

Burghignoli

et al. 2019

25th AIAA/CEAS Aeroacoustics Conference

View full text Add to dashboard Cite

Space-coiling metamaterials that exploit the so-called generalized Snell's law are suitable for the subwavelength manipulation of acoustic waves, leading to extraordinary refracting and reflecting metasurfaces. Typically, space-coiling metasurfaces are characterized by a narrow operating range in frequency due to the intrinsic connection between the design wavelength and the characteristic dimensions of the metasurface. The main goal of the present work is to design a broadband and modular space-coiling based metasurface, extending the range of frequency where the effective metabehaviour is achieved. The metasurface building set is composed by eight different unit cells, each introducing a tailored phase shift in the field, that can be combined side by side to produce the desired acoustic effect. The design parameters of each cell are selected as the result of an optimization process that minimizes the dependency on the operating frequency of the metabehaviour, keeping the overall thickness below a quarter of the design wavelength. Significant results are obtained for benchmark problems.

show abstract

“…ese metamaterials provide a way to control low-frequency sound waves with small-scale structures, but most of the above metamaterials only can achieve improved sound insulation within a single resonant frequency range, which thus provides only narrowband insulation. Researchers have adopted methods based on introduction of multiple coupled resonance units to broaden the insulation bandwidth [15][16][17][18][19][20][21][22][23]; however, most of these methods mainly broadened only their initial bandgaps. If a structure with multiple resonance modes can be developed to form multiple bandgaps, it will provide a promising basis for achievement of broadband sound insulation.…”

Section: Introductionmentioning

confidence: 99%

Fractal Acoustic Metamaterials with Subwavelength and Broadband Sound Insulation

Liu

Chen

et al. 2019

Shock and Vibration

View full text Add to dashboard Cite

We construct new fractal acoustic metamaterials by coiling up space, which can allow subwavelength-scale and broadband sound insulation to be achieved. Using the finite element method and the S-parameter retrieval method, the band structures, the effective parameters, and the transmission losses of these acoustic metamaterials with different fractal orders are researched individually. e results illustrate that it is easy to form low-frequency bandgaps using these materials and thus achieve subwavelength-scale sound control. As the number of fractal orders increase, more bandgaps appear. In particular, in the ΓX direction of the acoustic metamaterial lattice, more of these wide bandgaps appear in different frequency ranges, thus providing broadband sound insulation and showing promise for use in engineering applications.

show abstract

Broadband Tunable Acoustic Asymmetric Focusing Lens from Dual-Layer Metasurfaces

Cited by 112 publications

References 38 publications

Binary-phase acoustic passive logic gates

Binary-phase acoustic passive logic gates

Steering of Acoustic Reflection from Metasurfaces through Numerical Optimization

Fractal Acoustic Metamaterials with Subwavelength and Broadband Sound Insulation

Contact Info

Product

Resources

About