Functional Acoustic Metamaterials

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: 20 December 2025 | Viewed by 859

Special Issue Editor


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Guest Editor
Graduate School of Science and Engineering, Kagoshima University, Korimoto 1, Kagoshima-shi, Kagoshima 890-0065, Japan
Interests: acoustic metamaterials; anisotropic media; circuit simulation; electromagnetic metamaterials; optical metamaterials
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Special Issue Information

Dear Colleagues,

Following the invention of metamaterials, research trends have spread from electromagnetic waves to other waves, including acoustic waves. Metamaterials can behave quite differently from the perspective of directivity, which can be partly realized by its anisotropy. We can expect both academic analysis and engineering applications when we focus on anisotropy.

We invite researchers and engineers to contribute to this Special Issue on functional acoustic metamaterials, which is intended to serve as a unique multidisciplinary forum covering broad aspects of physics, engineering, and applications of acoustic metamaterials and metasurfaces.

Potential topics include, but are not limited to, the following:

  • Physical analysis of anisotropic acoustic metamaterials;
  • Structural proposal of anisotropic acoustic metamaterials;
  • Design and simulation methods of anisotropic acoustic metamaterials;
  • Demonstrations of anisotropic acoustic metamaterials;
  • Cloak and stealth phenomena using anisotropic acoustic metamaterials;
  • New applications of anisotropic acoustic metamaterials;
  • Anisotropic supersonic metamaterials.

The metamaterials described above include metasurfaces.

Prof. Dr. Seiji Fukushima
Guest Editor

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Keywords

  • anisotropy
  • acoustic(s)
  • metamaterial
  • metasurface
  • cloak, stealth
  • supersonic(s)
  • ultrasonic(s)
  • off-diagonal element

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Published Papers (1 paper)

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Research

14 pages, 3923 KB  
Article
Low-Frequency Band Gap Expansion of Acoustic Metamaterials Based on Multi-Mode Coupling Effect
by Yudong Wu, Zhiyuan Wu, Wang Yan, Shiqi Deng, Fangjun Zuo, Mingliang Yang and Weiping Ding
Crystals 2025, 15(9), 764; https://doi.org/10.3390/cryst15090764 - 27 Aug 2025
Viewed by 611
Abstract
To address the problem of low-frequency broadband vibration and noise encountered in engineering, a method for expanding the low-frequency band gap of locally resonant acoustic metamaterials is proposed based on the multi-mode coupling effect. A computational method for the band gap characteristics of [...] Read more.
To address the problem of low-frequency broadband vibration and noise encountered in engineering, a method for expanding the low-frequency band gap of locally resonant acoustic metamaterials is proposed based on the multi-mode coupling effect. A computational method for the band gap characteristics of second-order multi-mode acoustic metamaterials has been derived. By incorporating the vibrational modes obtained from band structure calculations, a systematic investigation of the formation mechanisms of multiple band gaps was conducted, revealing that the emergence of these multiple band gaps stems from the coupled resonance between elastic waves and distinct vibrational modes of the local resonator units. Furthermore, the influence of design parameter variations on the bandgap was investigated, and the strategy of realizing low-frequency multi-order bandgaps by increasing the order of local resonance units was examined. Finally, vibration tests were conducted on the second-, third-, and fourth-order multi-mode coupled acoustic metamaterials. The results demonstrated that these materials exhibit an expanded vibration band gap within the low-frequency range, and the measured frequency response aligns closely with the theoretical calculations. This type of acoustic metamaterial offers viable applicability for controlling low-frequency broadband vibrations. Full article
(This article belongs to the Special Issue Functional Acoustic Metamaterials)
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