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Crystals
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Recent Advances in Phononic Crystals and Acoustic Metamaterials
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Recent Advances in Phononic Crystals and Acoustic Metamaterials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 21608

Special Issue Editors

Prof. Dr. Jin-Chen Hsu

E-Mail Website
Guest Editor
Department of Mechanical Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan
Interests: phononic crystals; acoustic metamaterial; acoustofluidic manipulation; guided waves in piezoelectric materials
Special Issues, Collections and Topics in MDPI journals
Dr. Jia-Hong Sun

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Chang Gung University, Taoyuan City 333, Taiwan
Interests: phononic crystals; acoustic metamaterial; nondestructive testing; wave signal analysis by machine learning and AI
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Phononic crystals and acoustic metamaterials are artificial materials that exhibit extraordinary physical phenomena, functions, and properties in acoustics. Phononic crystals are generally periodic elastic composites or structures designed with local defects for controlling of acoustic wave propagation. Acoustic metamaterials are presented as relatively architectured materials composed of periodic or random distributions of subwavelength resonating units for generating unusual acoustical/physical parameters. Both derive their novel characteristics from the interaction between acoustic waves and designed materials. They have drawn significant attention from both the physics and engineering communities as they lie at the crossroads of vibration and acoustics engineering and condensed matter. This field has also been greatly advanced forward by scientists and researchers during the past decades. The territory involves disciplines from phonon physics in micro- and nanoscale systems, physical acoustics, acoustic wave sensors and devices, sound and noise control to seismic waves and vibration which cover broad applications of the acoustic waves in a variety of frequency ranges. Phononic crystals and acoustic metamaterials have been decidedly demonstrating their potential and promising applications in the acoustic wave spectrum both for now and the future.

In this Special Issue, we would like to invite all contributions related to phononic crystals and acoustic metamaterials. Theoretical, numerical, and experimental studies and investigations on these artificial materials are welcome. This Special Issue aims to publish novel research results but also to provide comprehensive understanding of the physics, mechanisms, materials, analyzing methods, applications, and recent development of phononic crystals and acoustic metamaterials. In light of recent advances, research articles, short communications, and review articles that are related but not limited to the following topics are encouraged to be submitted to this Special Issue.

  • thermal phononic crystals
  • topological phononic crystals
  • phononic/phoxonic sensors
  • phoxonic crystals and acousto-optic coupling
  • functional metamaterials
  • micro and nanoscale phononic crystals
  • acoustic metasurfaces
  • sonic crystals/metamaterials
  • underwater metamaterials (solid–fluid interaction)
  • seismic metamaterials
  • applications and devices with phononic crystals and acoustic metamaterials

Prof. Jin-Chen Hsu
Dr. Jia-Hong Sun
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • elastic wave
  • acoustic wave
  • phononic crystal
  • metamaterial
  • metasurface
  • phonon
  • ultrasound
  • periodic material
  • local resonance
  • vibration
  • band gap

Related Special Issue

Published Papers (6 papers)

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Research

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15 pages, 5526 KiB  
Article
Simultaneous Dirac-like Cones at Two Energy States in Tunable Phononic Crystals: An Analytical and Numerical Study
by Mustahseen M. Indaleeb and Sourav Banerjee
Crystals 2021, 11(12), 1528; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11121528 - 07 Dec 2021
Cited by 4 | Viewed by 2671
Abstract
Simultaneous occurrence of Dirac-like cones at the center of the Brillouin zone (Γ) at two different energy states is termed Dual-Dirac-like cones (DDC) in this article. The occurrence of DDC is a rare phenomenon. Thus, the generation of multiple Dirac-like cones at the [...] Read more.
Simultaneous occurrence of Dirac-like cones at the center of the Brillouin zone (Γ) at two different energy states is termed Dual-Dirac-like cones (DDC) in this article. The occurrence of DDC is a rare phenomenon. Thus, the generation of multiple Dirac-like cones at the center of the Brillouin zone is usually non-manipulative and poses a challenge to achieve through traditional accidental degeneracy. However, if predictively created, DDC will have multiple engineering applications with acoustics and vibration. Thus, the possibilities of creating DDC have been identified herein using a simple square periodic array of tunable square phononic crystals (PnCs) in air media. It was found that antisymmetric deaf bands may play critical roles in tracking the DDC. Hence, pivoting on the deaf bands at two different energy states, an optimized tuning parameter was found to achieve Dirac-like cones at two distinct frequency states, simultaneously. Orthogonal wave transport identified as key Dirac phenomena was achieved at two frequencies, herein. It was identified that beyond the Dirac-like cone, the Dirac phenomena remain dominant when a doubly degenerated state created by a top band with positive curvature and a near-flat deaf band are lifted from a bottom band with negative curvature. Utilizing a mechanism of rotating the PnCs near a fixed deaf band, frequencies are tracked to form the DDC, and orthogonal wave transport is demonstrated. Exploiting the dispersion behavior, unique acoustic phenomena, such as ballistic wave transmission, pseudo diffusion and acoustic cloaking are also demonstrated at the Dirac frequencies using numerical simulation. The proposed tunable acoustic PnCs will have important applications in acoustic and ultrasonic imaging, waveguiding and even acoustic computing. Full article
(This article belongs to the Special Issue Recent Advances in Phononic Crystals and Acoustic Metamaterials)
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11 pages, 5841 KiB  
Article
Linking Time-Domain Vibration Behaviors to Spatial-Domain Propagating Waves in a Leaf-like Gradient-Index Phononic Crystal Lens
by Kuo-Chih Chuang, Dan-Feng Wang, Jun-Jie Liu and Chan-Yi Liao
Crystals 2021, 11(12), 1490; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11121490 - 01 Dec 2021
Cited by 1 | Viewed by 1633
Abstract
It is known that a propagating wave at a certain spatial point can be decomposed into plane waves propagating at different angles. In this work, by designing a gradient index phononic crystal lens (GRIN PCL) with transverse-continuous leaf-like unit cells, we theoretically and [...] Read more.
It is known that a propagating wave at a certain spatial point can be decomposed into plane waves propagating at different angles. In this work, by designing a gradient index phononic crystal lens (GRIN PCL) with transverse-continuous leaf-like unit cells, we theoretically and experimentally show that the spatial-domain propagating waves in finite periodic structures can be linked to their time-domain vibration behaviors. The full-field instantaneous focusing behaviors of Lamb waves in the proposed leaf-like GRIN PCL give an example of the wave-vibration linkage in finite periodic structures while allowing a certain complexity. The conclusion in this paper can help one skip iterative time-consuming finite element analysis (e.g., time-stepping solutions) to avoid possible numerical instabilities occurred in calculating transient wave field on practical finite metamaterials or phononic crystals having unit cells with complicated configurations. Full article
(This article belongs to the Special Issue Recent Advances in Phononic Crystals and Acoustic Metamaterials)
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15 pages, 5274 KiB  
Article
Two-Dimensional Composite Acoustic Metamaterials of Rectangular Unit Cell from Pentamode to Band Gap
by Qi Li, Ke Wu and Mingquan Zhang
Crystals 2021, 11(12), 1457; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11121457 - 25 Nov 2021
Cited by 5 | Viewed by 1709
Abstract
Pentamode metamaterials have been receiving an increasing amount of interest due to their water-like properties. In this paper, a two-dimensional composite pentamode metamaterial of rectangular unit cell is proposed. The unit cells can be classified into two groups, one with uniform arms and [...] Read more.
Pentamode metamaterials have been receiving an increasing amount of interest due to their water-like properties. In this paper, a two-dimensional composite pentamode metamaterial of rectangular unit cell is proposed. The unit cells can be classified into two groups, one with uniform arms and the other with non-uniform arms. Phononic band structures of the unit cells were calculated to derive their properties. The unit cells can be pentamode metamaterials that permit acoustic wave travelling or have a total band gap that impedes acoustic wave propagation by varying the structures. The influences of geometric parameters and materials of the composed elements on the effective velocities and anisotropy were analyzed. The metamaterials can be used for acoustic wave control under water. Simulations of materials with different unit cells were conducted to verify the calculated properties of the unit cells. The research provides theoretical support for applications of the pentamode metamaterials. Full article
(This article belongs to the Special Issue Recent Advances in Phononic Crystals and Acoustic Metamaterials)
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17 pages, 4267 KiB  
Article
Study on Lamb Waves in a Composite Phononic Crystal Plate
by Lili Yuan, Peng Zhao, Yong Ding, Benjie Ding, Jianke Du, Tingfeng Ma and Ji Wang
Crystals 2020, 10(9), 799; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst10090799 - 09 Sep 2020
Cited by 8 | Viewed by 2224
Abstract
In the paper, a phononic crystal plate composed of a magnetorheological elastomer with adjustable band gaps in the low frequency range is constructed. The dispersion relations of Lamb waves are studied by the supercell plane wave expansion method. The transmission responses as well [...] Read more.
In the paper, a phononic crystal plate composed of a magnetorheological elastomer with adjustable band gaps in the low frequency range is constructed. The dispersion relations of Lamb waves are studied by the supercell plane wave expansion method. The transmission responses as well as the displacement fields of Lamb waves are calculated by the finite element method. The influence of geometric parameters on the band gaps, the regulation effect of the volume ratio of Fe particles and the bias magnetic field on the band gaps are analyzed. Based on the numerical results, we find that the volume ratio of Fe particles and the magnetic field affect the band gap effectively. The location and width of the band gaps can be adjusted within a broad frequency range by varying the geometric parameters and magnetic field. We can control the band gap, achieve an appropriate and wide low band gap by selecting proper geometric parameters and applying an external contactless magnetic field to deal with complicated and changeable engineering environment. The results are useful for understanding and optimizing the design of composite vibration isolation plates. Full article
(This article belongs to the Special Issue Recent Advances in Phononic Crystals and Acoustic Metamaterials)
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10 pages, 1379 KiB  
Communication
Solving Noise Pollution Issue Using Plenum Window with Perforated Thin Box
by Hsiao Mun Lee, Andi Haris, Kian Meng Lim, Jinlong Xie and Heow Pueh Lee
Crystals 2020, 10(7), 614; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst10070614 - 14 Jul 2020
Cited by 3 | Viewed by 2837
Abstract
In the present study, a conventional plenum window was incorporated with perforated thin box in order to enhance its performance at frequency range which centralized at 1000 Hz as most of the common noise sources at city nowadays are centralizing around this frequency. [...] Read more.
In the present study, a conventional plenum window was incorporated with perforated thin box in order to enhance its performance at frequency range which centralized at 1000 Hz as most of the common noise sources at city nowadays are centralizing around this frequency. The entire studies were conducted in a reverberation room. The effectiveness of jagged flap on mitigating diffracted sound was also studied. Three types of noises were examined in the current study—white noise, traffic noise and construction noises. The experimental results showed that the plenum window with perforated thin box could reduce 8.4 dBA, 8.7 dBA and 6.9 dBA of white, traffic and construction noises, respectively. The jagged flaps did not have significant effect on the plenum window’s noise mitigation performance. When frequencies were ranging from 800 Hz to 1250 Hz, when compared with the case of without perforated thin box, it was found that the perforated thin box had good acoustic performance where it was able to reduce additional 1.6 dBA, 1.6 dBA and 1.2 dBA of white, construction and traffic noises, respectively. Full article
(This article belongs to the Special Issue Recent Advances in Phononic Crystals and Acoustic Metamaterials)
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Review

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22 pages, 6047 KiB  
Review
Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances
by Sanjay Kumar and Heow Pueh Lee
Crystals 2020, 10(8), 686; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst10080686 - 07 Aug 2020
Cited by 42 | Viewed by 8838
Abstract
In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials. The acoustic metamaterials have demonstrated excellent acoustical characteristics that paved a new pathway for researchers to develop [...] Read more.
In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials. The acoustic metamaterials have demonstrated excellent acoustical characteristics that paved a new pathway for researchers to develop effective solutions for a wide variety of multifunctional applications, such as low-frequency sound attenuation, sound wave manipulation, energy harvesting, acoustic focusing, acoustic cloaking, biomedical acoustics, and topological acoustics. This review provides an update on the acoustic metamaterials’ recent progress for simultaneous sound attenuation and air ventilation performances. Several variants of acoustic metamaterials, such as locally resonant structures, space-coiling, holey and labyrinthine metamaterials, and Fano resonant materials, are discussed briefly. Finally, the current challenges and future outlook in this emerging field are discussed as well. Full article
(This article belongs to the Special Issue Recent Advances in Phononic Crystals and Acoustic Metamaterials)
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