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Recent Advances in Phononic Crystals and Acoustic Metamaterials (Volume II)

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

Deadline for manuscript submissions: closed (30 April 2023) | Viewed by 4382

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Special Issue Editors

Prof. Dr. Jin-Chen Hsu

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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

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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 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 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 of 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 a 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 related but not limited to the following topics are encouraged for submission 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. Dr. 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

Recent Advances in Phononic Crystals and Acoustic Metamaterials in Crystals (6 articles)

Published Papers (3 papers)

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Research

19 pages, 9053 KiB

Open AccessEditor’s ChoiceArticle

Reflections of High-Frequency Pulsed Ultrasound by Underwater Acoustic Metasurfaces Composed of Subwavelength Phase-Gradient Slits

by Jin-Chen Hsu, Herwandi Alwi, Chun-Hao Wei, Kai-Li Liao and Che-Ting Huang

Crystals 2023, 13(5), 846; https://doi.org/10.3390/cryst13050846 - 20 May 2023

Cited by 3 | Viewed by 1284

Abstract

We numerically and experimentally investigated the behavior of high-frequency underwater ultrasounds reflected by gradient acoustic metasurfaces. Metasurfaces were fabricated with a periodic array of gradient slits along the surface of a steel specimen. The finite element method was adopted for the acoustics–structure interaction problem to design the metasurfaces and simulate the reflected fields of the incident ultrasound. Our metasurfaces yielded anomalous reflection, specular reflection, apparent negative reflection, and radiation of surface-bounded modes for ultrasonic waves impinging on the metasurfaces at different incident angles. The occurrence of these reflection behaviors could be explained by the generalized Snell’s law for a gradient metasurface with periodic supercells. We showed that at some incident angles, strong anomalous reflection could be generated, which could lead to strong retroreflection at specific incident angles. Furthermore, we characterized the time evolution of the reflections using pulsed ultrasound. The simulated transient process revealed the formation of propagating reflected ultrasound fields. The experimentally measured reflected ultrasound signals verified the distinct reflection behaviors of the metasurfaces; strong anomalous reflection steering the ultrasound pulse and causing retroreflection was observed. This study paves the way for designing underwater acoustic metasurfaces for ultrasound imaging and caustic engineering applications using pulsed ultrasound in the high-frequency regime. Full article

(This article belongs to the Special Issue Recent Advances in Phononic Crystals and Acoustic Metamaterials (Volume II))

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11 pages, 2163 KiB

Open AccessArticle

High-Q Slow Sound Mode in a Phononic Fishbone Nanobeam Using an Acoustic Potential Well Cavity

by Ying-Pin Tsai, Bor-Shyh Lin and Fu-Li Hsiao

Crystals 2023, 13(1), 95; https://doi.org/10.3390/cryst13010095 - 4 Jan 2023

Cited by 1 | Viewed by 1194

Abstract

Phononic crystals and phononic metamaterials are popular structures for manipulating acoustic waves with artificially arranged units that have different elastic constants. These structures are also used in acousto-optic coupling and optomechanical structures. In such research, a 1-D nanobeam containing a cavity region sandwiched by two mirror regions is one of the most common designs. However, searching bandgaps for suitable operation modes and the need for the mirror region are limitations in the device design. Therefore, we introduce the slow sound mode as the operating acoustic mode and use an acoustic potential well to further trap the phonons in the cavity. Three types of structures are introduced to investigate the effect of the potential well. The products of the mode frequencies and the quality factors of the modes are used to demonstrate the performance of the structures. The displacement field and the strain field show the concentrated slow sound modes of the potential wells and produce high quality factors. Full article

(This article belongs to the Special Issue Recent Advances in Phononic Crystals and Acoustic Metamaterials (Volume II))

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19 pages, 2943 KiB

Open AccessArticle

Tunable Topological Acoustic Tamm States in Comblike Structures Based on Band Inversion around Flat Bands

by Soufyane Khattou, Yamina Rezzouk, Madiha Amrani, Mohamed El Ghafiani, El Houssaine El Boudouti, Abdelkrim Talbi and Bahram Djafari-Rouhani

Crystals 2022, 12(12), 1685; https://doi.org/10.3390/cryst12121685 - 22 Nov 2022

Cited by 2 | Viewed by 1365

Abstract

We investigate the existence of acoustic Tamm states at the interface between two one-dimensional (1D) comblike phononic crystals (PnCs) based on slender tubes and discuss their topological or trivial character. The PnCs consist of stubs grafted periodically along a waveguide and the two crystals differ by their geometrical parameters (period and length of the stubs). We use several approaches to discuss the existence of Tamm states and their topology when connecting two half-crystals. First, we derive a necessary and sufficient condition on the existence of interface states based on the analysis of the bulk band structure and the symmetry of the band edge states. This approach is equivalent to an analysis of the Zak phases of the bulk bands in the two crystals. Indeed, a topological interface state should necessarily exist in any common bandgap of the two PnCs for which the lower (upper) band edges have opposite symmetries. A novelty of our structure consists in the fact that the symmetry inversion results from a band closure (flat band) rather than from a gap closure, in contrast to previous works. Then, such interface states are revealed through different physical quantities, namely: (i) the local density of states (LDOS), which exhibits a high localization around the interface; (ii) sharp peaks in the transmission spectra in the common bandgap when two finite crystals are connected together; (iii) the phases of the reflection coefficients at the boundary of each PnC with a waveguide, which have a direct relationship with the Zak phases. In addition, we show that the interface states can transform to bound states in the continuum (BICs). These BICs are induced by the cavity separating both PnCs and they remain robust to any geometrical disorder induced by the stubs and segments around this cavity. Finally, we show the impossibility of interface states between two connected PnCs with different stub lengths and similar periods. The sensitivity of these states to interface perturbations can find many practical applications in PnC sensors. Full article

(This article belongs to the Special Issue Recent Advances in Phononic Crystals and Acoustic Metamaterials (Volume II))

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