Asymmetric transmission of acoustic waves in a waveguide via gradient index metamaterials

Cao, Wen Kang; Wu, Li; Zhang, Cheng; Ke, Jun Chen; Cheng, Qiang; Cui, Tie Jun; Jing, Yun

doi:10.1016/j.scib.2019.01.002

Cited by 37 publications

(16 citation statements)

References 29 publications

(32 reference statements)

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“…[22] A combination of CNC, additive manufacturing, manual methods, and/or assembly is an efficient approach to the fabrication of AMs. [46,72,[141][142][143] For example, to enhance sound transmission loss, Lee et al [144,145] assembled a membranetype AM composed of two Mylar films and inner and outer frames printed via FDM using PLA (Figure 10h). Wang et al, [75] on the other hand, fabricated a double-zero, membrane-type metamaterial using circular steel disks, fiberglass wool, and polycarbonate film via machining and assembly.…”

Section: Miscellaneous Fabrication Approachesmentioning

confidence: 99%

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

Liao

Luan

Wang

et al. 2021

Adv Materials Technologies

111

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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.

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Section: Miscellaneous Fabrication Approachesmentioning

confidence: 99%

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

Liao

Luan

Wang

et al. 2021

Adv Materials Technologies

111

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“…Rectangular waveguides filled with inhomogeneous dielectrics are the most fundamental guided wave structures [1] to realize various functional microwave devices, such as filters [2]; couplers [3]; dividers [4]; and substrate integrated waveguides (SIWs) [5,6]. e overall performances of such devices strongly depend on the guided wave propagation properties of the waveguides.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Semianalytical Modal Analysis of Rectangular Waveguides Containing Metamaterials with Graded Inhomogeneity

Weng

Lin

Wu³

2021

International Journal of Antennas and Propagation

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Rectangular waveguides containing inhomogeneous metamaterials with graded refractive-index profiles have potential applications in bending waveguides and radiation-enhanced antennas, and accurate eigenvalue solutions are prerequisite. Commonly used commercial electromagnetic solvers such as HFSS, COMSOL, and CST could not efficiently calculate the eigenvalues of waveguides containing graded refractive-index dielectrics. In this paper, an accurate and efficient semianalytical method based on the modal expansion has been proposed to solve these waveguides. The proposed method has been employed to calculate the eigenvalues, including the cutoff wavenumbers and dispersion relations, for metamaterials with various graded refractive-index profiles. Calculated results are then validated by comparison, using commercial solver HFSS, which indicates the superiority of the proposed method in accuracy and efficiency. Below-cutoff backward wave propagation is observed in waveguides filled with graded refractive-index metamaterials, which provides a new approach for waveguide miniaturization.

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“…Microscopic phenomena, such as molecular spontaneous emission 11 and bound states in the continuum 12 , can also be manipulated by metamaterials. After years of development, metamaterials have been fully developed in various morphologies, from acoustic waves 13 to light 14 . A metasurface is a two-dimensional morphology of metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Multichannel direct transmissions of near-field information

et al. 2019

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A digital-coding programmable metasurface (DCPM) is a type of functional system that is composed of subwavelength-scale digital coding elements with opposite phase responses. By configuring the digital coding elements, a DCPM can construct dynamic near-field image patterns in which the intensity of each pixel of the image can be dynamically and independently modulated. Thus, a DCPM can perform both spatial and temporal modulations. Here, this advantage is used to realize multichannel direct transmissions of near-field information. Three points are selected in the near-field region to form three independent channels. By applying various digital phase codes on the DCPM, independent binary digital symbols defined by amplitude codes (namely, weak and strong amplitudes) are transmitted through the three channels. The measured near-field distributions and temporal transmissions of the system agree with numerical calculations. Compared with the conventional multichannel transmission, the proposed mechanism achieves simultaneous spatial and temporal modulations by treating DCPM as an energy radiator and information modulator, thereby enduing DCPM with high potential in near-field information processing and communications.

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Asymmetric transmission of acoustic waves in a waveguide via gradient index metamaterials

Cited by 37 publications

References 29 publications

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

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

An Efficient Semianalytical Modal Analysis of Rectangular Waveguides Containing Metamaterials with Graded Inhomogeneity

Multichannel direct transmissions of near-field information

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