Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials

Zhang, Lingling; Liu, Xiaojun

doi:10.3390/app12125962

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…Acoustic metamaterials [14] are artificial materials with special acoustic properties. Unlike traditional materials, acoustic metamaterials have unconventional acoustic properties such as negative refraction [77,78], negative resistance [79,80] , negative sound velocity [81,82], etc. It is usually composed of periodically arranged unit structures, which can be a combination of solids, gases or liquids.…”

Section: Acoustic Metamaterialsmentioning

confidence: 99%

Research progress of noise reduction of composite structures of porous materials and acoustic metamaterials

Huang,

Yang,

Talukder

et al. 2024

Phys. Scr.

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Noise pollution is an important problem affecting people's lives and work quality. In the current noise reduction materials, the porous sound absorption materials usually only haveagood sound absorption effect for medium and high -frequency sound waves, and the sound absorption effect for low -frequency sound waves is relatively weak. However, in recent years, the research on acoustic metamaterials has made a breakthrough which can effectively absorb or isolate low-frequency sound waves. Therefore, researchers propose to combine porous sound-absorbing materials with acoustic metamaterials to form a composite structure, that broadens the frequency range of noise reduction, so as to achieve the goal of full-frequency domain noise reduction. This paper first introduces the research progress of porous materials and acoustic metamaterials, and then introduces the research progress of composite structures that are made of porous materials and acoustic metamaterials. Finally, the application prospect of the composite field of porous sound-absorbing materials and acoustic metamaterials are summarized.

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Section: Acoustic Metamaterialsmentioning

confidence: 99%

Research progress of noise reduction of composite structures of porous materials and acoustic metamaterials

Huang,

Yang,

Talukder

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

show abstract

Bidirectional Acoustic Negative Refraction Based on a Pair of Identical Purely Imaginary Metamaterials Slabs

et al. 2022

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Acoustic purely imaginary metamaterials (PIMs) slabs can support the coexistence of coherent perfect absorption and laser modes and are used to achieve negative refraction. Previous works have focused on a pair of different PIM slabs, one operating in CPA mode and the other in laser mode. However, this structure has restrictions on the incident wave direction, specifically the wave can only be incident from the CPA side. In this paper, we derive the analytical expressions for the parameters required for the coexistence of CPA and laser modes in acoustic PIM slabs. Numerical simulation results show that such PIM slab can freely switch states between the coherent complete absorber and the laser depending on the incidence direction. On this basis, by using a pair of identical PIM slabs, bidirectional negative refraction and planar focusing can be achieved. In addition, the parameters in the appropriate range can be found by adjusting the mode order, which facilitates the experimental verification. So far, the required acoustic purely imaginary metamaterials (PIMs) have not been experimentally demonstrated, and the results presented in the manuscript are theoretical speculations on their existence, so practical applications may require more sophisticated design and engineering.

show abstract

Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials

Cited by 2 publications

References 33 publications

Research progress of noise reduction of composite structures of porous materials and acoustic metamaterials

Research progress of noise reduction of composite structures of porous materials and acoustic metamaterials

Bidirectional Acoustic Negative Refraction Based on a Pair of Identical Purely Imaginary Metamaterials Slabs

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