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Articles de revues sur le sujet « Phononic Properties »

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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Khurgin, Jacob B. « Relative merits of phononics vs. plasmonics : the energy balance approach ». Nanophotonics 7, no 1 (1 janvier 2018) : 305–16. http://dx.doi.org/10.1515/nanoph-2017-0048.

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AbstractThe common feature of various plasmonic schemes is their ability to confine optical fields of surface plasmon polaritons (SPPs) into subwavelength volumes and thus achieve a large enhancement of linear and nonlinear optical properties. This ability, however, is severely limited by the large ohmic loss inherent to even the best of metals. However, in the mid- and far-infrared ranges of the spectrum, there exists a viable alternative to metals – polar dielectrics and semiconductors, in which dielectric permittivity (the real part) turns negative in the Reststrahlen region. This feature engenders the so-called surface phonon polaritons, capable of confining the field in a way akin to their plasmonic analogs, the SPPs. Since the damping rate of polar phonons is substantially less than that of free electrons, it is not unreasonable to expect that phononic devices may outperform their plasmonic counterparts. Yet a more rigorous analysis of the comparative merits of phononics and plasmonics reveals a more nuanced answer, namely, that while phononic schemes do exhibit narrower resonances and can achieve a very high degree of energy concentration, most of the energy is contained in the form of lattice vibrations so that enhancement of the electric field and, hence, the Purcell factor is rather small compared to what can be achieved with metal nanoantennas. Still, the sheer narrowness of phononic resonances is expected to make phononics viable in applications where frequency selectivity is important.
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2

Cui, Hong, Yunjian Chen, Qin Kang, Pengyue Shan, Tie Yang et Peng Wang. « Coincident Nodal Line and Nodal Surface Phonon States in Ternary Phosphide Compound BaLiP ». Crystals 12, no 10 (18 octobre 2022) : 1478. http://dx.doi.org/10.3390/cryst12101478.

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With the continuous development of topological properties in condensed matter systems, the current research focus has been expanded into phononic bosonic states. Compared with the conventional electronic fermions, topological phonons exhibit very distinct features. In this study, based on density functional calculations, we have systematically investigated the topological phonons in the ternary phosphide compound BaLiP. Coincident nodal line and nodal surface states are revealed in the middle part of the phononic spectrum and they are formed by the same two phonon bands. Detailed band structure mechanism and symmetry operation formalism are provided. More importantly, evident surface states are observed from the entire nodal line and they are all well separated from the bulk state projection, very beneficial and preferable for future experimental investigation. Lastly, the mechanical properties are also examined and several important parameters are provided, which can be very useful for the practical application. Considering the multiple advantages of the topological nodal states in this material, the corresponding experimental study can be immediately inspired.
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3

Tanaka, Y., S. Tamura, A. V. Akimov, A. B. Pevtsov, S. F. Kaplan, A. A. Dukin, V. G. Golubev, D. R. Yakovlev et M. Bayer. « Phononic properties of opals ». Journal of Physics : Conference Series 92 (1 décembre 2007) : 012107. http://dx.doi.org/10.1088/1742-6596/92/1/012107.

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4

Garus, Sebastian, et Michal Szota. « Band GAP Frequency Response in Regular Phononic Crystals ». Revista de Chimie 69, no 12 (15 janvier 2019) : 3372–75. http://dx.doi.org/10.37358/rc.18.12.6752.

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The study investigated the propagation of a mechanical wave in a two-dimensional phononic structure. The influence of material from which metaatom rods were made on the phononical properties of the structure was investigated. Rods made of amorphous Zr55Cu30Ni5Al10 and polypropylenes were compared. The Finite Difference Time Domain (FDTD) algorithm was used to carry out the simulation. Next, theoretical and experimental analysis of the intensity of the mechanical wave was carried out. Frequency response of a regular phononic structure was also analyzed.
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5

Chakraborty, Srija, et Santanu K. Maiti. « Localization phenomena in a one-dimensional phononic lattice with finite mass modulation : Beyond nearest-neighbor interaction ». Journal of Physics : Conference Series 2349, no 1 (1 septembre 2022) : 012009. http://dx.doi.org/10.1088/1742-6596/2349/1/012009.

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One-dimensional phononic systems beyond conventional nearest-neighbor interaction have not been well explored, to the best of our knowledge. In this work, we critically investigate the localization properties of a 1D phononic lattice in presence of second-neighbor interaction along with the nearest-neighbor one. A finite modulation in masses is incorporated following the well known Aubry-Andre-Harper (AAH) form to make the system a correlated disordered one. Solving the motion equations we determine the phonon frequency spectrum, and characterize the localization properties of the individual phononic states by calculating inverse participation ratio (IPR). The key aspect of our analysis is that, in the presence of second-neighbor interaction, the phonon eigenstates exhibit frequency dependent transition from sliding to the pinned phase upon the variation of the modulation strength, exhibiting a mobility edge. This is completely in contrast to the nearest-neighbor interaction case, where all the states get localized beyond a particular modulation strength, and thus, no mobility edge appears. Our analysis can be utilized in many aspects to regulate phonon transmission through similar kind of aperiodic lattices that are described beyond the usual nearest-neighbor interaction.
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6

PANG, XIAO-FENG. « CHANGES IN THE PHYSICAL PROPERTIES OF NONADIABATICALLY COUPLED ELECTRON–PHONON SYSTEMS ARISING FROM SQUEEZING–ANTISQUEEZING EFFECT ». International Journal of Modern Physics B 17, no 31n32 (30 décembre 2003) : 6031–56. http://dx.doi.org/10.1142/s0217979203023471.

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Changes in the physical properties such as the ground state properties, charge density wave ordering, binding energy and energy bandwidth of polaron and quantum fluctuation, and minimum uncertainty relation of phonons and nonadiabatically coupled electron–phonon systems with spin-1/2 have been investigated by our new state ansatz which can account for correlation among the phononic displacement, squeezing and polaron effects using variational method in one-dimensional Holstein model. The investigation here shows that the squeezing–antisqueezing effect (correlated) results in a decrease of the ground state energy, an increase of the binding energy of polarons, the reduction of the uncertainty and quantum fluctuation of the phonons, a decrease of polaron narrowing of electron bandwidth, an increase of tunneling effect of the polarons and an increase of CDW ordering and phonon staggered ordering when compared with the uncorrelated case. Therefore, this shows that the ground state determined by the new state ansatz is the most stable. The new ansatz which include the squeezing–antisqueezing (correlated) effect is very relevant for the coupled electron–phonon systems, especially in strongly coupled and highly squeezed cases.
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7

He, Yuyang, et Xiaoxiong Jin. « Vibration Properties of a Steel-PMMA Composite Beam ». Shock and Vibration 2015 (2015) : 1–7. http://dx.doi.org/10.1155/2015/639164.

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A steel-polymethyl methacrylate (steel-PMMA) beam was fabricated to investigate the vibration properties of a one-dimensional phononic crystal structure. The experimental system included an excitation system, a signal acquisition system, and a data analysis and processing system. When an excitation signal was exerted on one end of the beam, the signals of six response points were collected with acceleration sensors. Subsequent signal analysis showed that the beam was attenuated in certain frequency ranges. The lumped mass method was then used to calculate the bandgap of the phononic crystal beam to analyze the vibration properties of a beam made of two different materials. The finite element method was also employed to simulate the vibration of the phononic crystal beam, and the simulation results were consistent with theoretical calculations. The existence of the bandgap was confirmed experimentally and theoretically, which allows for the potential applications of phononic crystals, including wave guiding and filtering, in integrated structures.
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8

Chen, Luyun, Yong Liu et Hui Kong. « Acoustic Tunneling Study for Hexachiral Phononic Crystals Based on Dirac-Cone Dispersion Properties ». Crystals 11, no 12 (17 décembre 2021) : 1577. http://dx.doi.org/10.3390/cryst11121577.

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Acoustic tunneling is an essential property for phononic crystals in a Dirac-cone state. By analyzing the linear dispersion relations for the accidental degeneracy of Bloch eigenstates, the influence of geometric parameters on opening the Dirac-cone state and the directional band gaps’ widths are investigated. For two-dimensional hexachiral phononic crystals, for example, the four-fold accidental degenerate Dirac point emerges at the center of the irreducible Brillouin zone (IBZ). The Dirac cone properties and the band structure inversion problem are discussed. Finally, to verify acoustic transmission properties near the double-Dirac-cone frequency region, the numerical calculation of the finite-width phononic crystal structure is carried out, and the acoustic transmission tunneling effect is proved. The results enrich and expand the manipulating method in the topological insulator problem for hexachiral phononic crystals.
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9

Spadoni, Alessandro, Massimo Ruzzene, Stefano Gonella et Fabrizio Scarpa. « Phononic properties of hexagonal chiral lattices ». Wave Motion 46, no 7 (novembre 2009) : 435–50. http://dx.doi.org/10.1016/j.wavemoti.2009.04.002.

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10

Ghachi, Ratiba F., Wael I. Alnahhal, A. B. M. Tahidul Haque, Jong Min Shim et Amjad Aref. « Flexural Vibration Attenuation Properties of Phononic Crystals ». Key Engineering Materials 821 (septembre 2019) : 414–18. http://dx.doi.org/10.4028/www.scientific.net/kem.821.414.

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Phononic crystals (PCs) have the ability to have phononic bandgaps dependent on the acoustic properties of its constituent materials (i.e., mass, elasticity). Forming a 1D periodic variation using a viscoelastic material allow the PC to have more wave vibration attenuation in the longitudinal direction. In this study, the low transmission zones and the vibration attenuation properties of a one-dimensional PC subjected to flexural vibration was evaluated experimentally. Results were presented in the form of frequency response functions and showed the flexural low-frequency zones starting at 500 Hz with three zones in the 16kHz range.
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11

He, Juxing, Honglang Li, Yahui Tian, Qiaozhen Zhang, Zixiao Lu et Jianyu Lan. « Numerical Analysis of Viscous Dissipation in Microchannel Sensor Based on Phononic Crystal ». Micromachines 12, no 8 (21 août 2021) : 994. http://dx.doi.org/10.3390/mi12080994.

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Phononic crystals with phononic band gaps varying in different parameters represent a promising structure for sensing. Equipping microchannel sensors with phononic crystals has also become a great area of interest in research. For building a microchannels system compatible with conventional micro-electro-mechanical system (MEMS) technology, SU-8 is an optimal choice, because it has been used in both fields for a long time. However, its mechanical properties are greatly affected by temperature, as this affects the phononic bands of the phononic crystal. With this in mind, the viscous dissipation in microchannels of flowing liquid is required for application. To solve the problem of viscous dissipation, this article proposes a simulation model that considers the heat transfer between fluid and microchannel and analyzes the frequency domain properties of phononic crystals. The results show that when the channel length reaches 1 mm, the frequency shift caused by viscous dissipation will significantly affect detecting accuracy. Furthermore, the temperature gradient also introduces some weak passbands into the band gap. This article proves that viscous dissipation does influence the band gap of phononic crystal chemical sensors and highlights the necessity of temperature compensation in calibration. This work may promote the application of microchannel chemical sensors in the future.
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12

Weng, Rui, Yun Zhang, Ze-Kun Yang, Yu-Jie Liu, Bao-Liang Ma et Hong-Wei Yang. « Study on the transmission properties of periodical and quasi-periodical phononic crystal in elastic wave ». Modern Physics Letters B 29, no 34 (20 décembre 2015) : 1550229. http://dx.doi.org/10.1142/s0217984915502292.

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The propagation of the elastic wave in phononic crystal is different from the normal uniformity medium. The finite-difference time-domain (FDTD) method is irrelevant to structure model and used widely. Moreover, when the numerical stability of FDTD iterations is satisfied, the elastic waves’ transmission property through periodical and quasi-periodical phononic crystal can be achieved. In this paper, the transmission coefficients of elastic wave through two systems are numerically calculated and the results of band gaps are analyzed. The results are helpful to study phononic crystal.
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13

He, Feiyang, Zhiyu Shi, Denghui Qian, Y. K. Lu, Yujia Xiang et Xuelei Feng. « Flexural wave bandgap properties of phononic crystal beams with interval parameters ». Applied Mathematics and Mechanics 44, no 2 (23 janvier 2023) : 173–88. http://dx.doi.org/10.1007/s10483-023-2947-8.

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AbstractUncertainties are unavoidable in practical engineering, and phononic crystals are no exception. In this paper, the uncertainties are treated as the interval parameters, and an interval phononic crystal beam model is established. A perturbation-based interval finite element method (P-IFEM) and an affine-based interval finite element method (A-IFEM) are proposed to study the dynamic response of this interval phononic crystal beam, based on which an interval vibration transmission analysis can be easily implemented and the safe bandgap can be defined. Finally, two numerical examples are investigated to demonstrate the effectiveness and accuracy of the P-IFEM and A-IFEM. Results show that the safe bandgap range may even decrease by 10% compared with the deterministic bandgap without considering the uncertainties.
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14

Yang, Z. J., J. Li, R. F. Linghu, X. S. Song, X. L. Cheng et X. D. Yang. « Electronic and phononic properties of V2AlC via first principles ». Canadian Journal of Physics 91, no 10 (octobre 2013) : 822–25. http://dx.doi.org/10.1139/cjp-2012-0475.

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The electronic and phononic properties of V2AlC have been extensively studied using ab initio pseudopotential density functional theory. Our investigations revealed that the longest V–V bond and its least variations have led to the stiffer c axis. The nearly unchanged net charge of the C atom under pressure has led to nearly unchanged overlapped populations along the C–V bond. The obvious charge transfer of V → Al has induced significant variations of the overlapped populations along Al–V and V–V bonds. An anomalous variation of charge transfer between V and Al atoms and V–V bond populations at about 700 GPa has been revealed, which may relate to its structural instability at about 731 GPa. Previously calculated structural instability at about 731 GPa has been successfully confirmed by the present phonon dispersion curve. The bonding natures are also studied by the electron density difference, electron density of states, and the energy band structure.
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15

Laude, V. « Principles and properties of phononic crystal waveguides ». APL Materials 9, no 8 (1 août 2021) : 080701. http://dx.doi.org/10.1063/5.0059035.

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16

Mokhtari, Amir Ashkan, Yan Lu et Ankit Srivastava. « On the properties of phononic eigenvalue problems ». Journal of the Mechanics and Physics of Solids 131 (octobre 2019) : 167–79. http://dx.doi.org/10.1016/j.jmps.2019.07.005.

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17

Zhao, Honggang, Yaozong Liu, Dianlong Yu, Gang Wang, Jihong Wen et Xisen Wen. « Absorptive properties of three-dimensional phononic crystal ». Journal of Sound and Vibration 303, no 1-2 (juin 2007) : 185–94. http://dx.doi.org/10.1016/j.jsv.2007.01.004.

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18

Elapolu, Mohan S. R., Alireza Tabarraei, Amin Reihani et Ali Ramazani. « Phononic thermal transport properties of C3N nanotubes ». Nanotechnology 31, no 3 (21 octobre 2019) : 035705. http://dx.doi.org/10.1088/1361-6528/ab4834.

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19

Bai, Wen-Chao, Yan Cao, Ben-Hu Zhou, Jian-Lin Liu, Gui-Xiang Liu, Han Zhang, Han-Zhuang Zhang et Hui Hu. « Theoretical Investigation of Magneto-Electro-Elastic Piezoelectric Phononic Crystal ». Crystals 12, no 6 (20 juin 2022) : 876. http://dx.doi.org/10.3390/cryst12060876.

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We design a magneto-electro-elastic piezoelectric phononic crystal (MPPC) using a one-dimensional piezoelectric superlattice (with a 3m point group) and split-ring resonators. The effect of the split-ring resonators is to enhance the piezoelectric effect of the piezoelectric superlattices. This effect will create elastic anomalies and generate the phononic band gaps. These are first proposed theoretically. We calculate the transmission function of the MPPC through Transfer Matrix Method of the phononic crystal. By using the transmission function, we theoretically study the propagation properties of the acoustic waves in the MPPC. The mechanism for multifield coupling is analyzed. A type of phononic band gap is created, called the multifield coupling phononic band gap. We analyze the possibility of crystals as left-handed metamaterials. We also discuss some potential applications.
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20

Wang, Ke, WuXing Zhou, Yuan Cheng, Min Zhang, Hai Wang et Gang Zhang. « Magnetic order-dependent phonon properties in 2D magnet CrI3 ». Nanoscale 13, no 24 (2021) : 10882–90. http://dx.doi.org/10.1039/d1nr00820j.

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21

Jin, Yabin, Liangshu He, Zhihui Wen, Bohayra Mortazavi, Hongwei Guo, Daniel Torrent, Bahram Djafari-Rouhani, Timon Rabczuk, Xiaoying Zhuang et Yan Li. « Intelligent on-demand design of phononic metamaterials ». Nanophotonics 11, no 3 (3 janvier 2022) : 439–60. http://dx.doi.org/10.1515/nanoph-2021-0639.

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Abstract With the growing interest in the field of artificial materials, more advanced and sophisticated functionalities are required from phononic crystals and acoustic metamaterials. This implies a high computational effort and cost, and still the efficiency of the designs may be not sufficient. With the help of third-wave artificial intelligence technologies, the design schemes of these materials are undergoing a new revolution. As an important branch of artificial intelligence, machine learning paves the way to new technological innovations by stimulating the exploration of structural design. Machine learning provides a powerful means of achieving an efficient and accurate design process by exploring nonlinear physical patterns in high-dimensional space, based on data sets of candidate structures. Many advanced machine learning algorithms, such as deep neural networks, unsupervised manifold clustering, reinforcement learning and so forth, have been widely and deeply investigated for structural design. In this review, we summarize the recent works on the combination of phononic metamaterials and machine learning. We provide an overview of machine learning on structural design. Then discuss machine learning driven on-demand design of phononic metamaterials for acoustic and elastic waves functions, topological phases and atomic-scale phonon properties. Finally, we summarize the current state of the art and provide a prospective of the future development directions.
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22

Marunin, Mikhail V., et Nataliya V. Polikarpova. « Polarization of Acoustic Waves in Two-Dimensional Phononic Crystals Based on Fused Silica ». Materials 15, no 23 (23 novembre 2022) : 8315. http://dx.doi.org/10.3390/ma15238315.

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The two-dimensional square-lattice phononic crystal is one of the recently proposed acoustic metamaterials. Strong anisotropic propagation of elastic waves makes the material promising for various potential applications in acoustics and acousto-optics. This paper presents a study of the propagation of elastic waves in two-dimensional phononic crystals based on fused silica. The band structures of a phononic crystal are obtained by solving the wave equation in its variational form by the finite element method. The main phononic crystal acoustic characteristics that are of practical interest in acousto-optics are calculated based on the analysis of the dispersion relations. It is shown that the choice of the phononic crystal geometry makes it possible to control the distributions of both the inverse phase velocities and the energy walk-off angles of acoustic modes. The calculations of the acoustic modes’ polarization are in a particular focus. It is demonstrated that under certain conditions, there are exactly three acoustic modes propagating in a phononic crystal, the averaged polarization vectors of which are mutually orthogonal for any directions of the acoustic wave’s propagation. It is argued that the acoustic properties of phononic crystals meet the requirements of acousto-optics.
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23

Zhang, Pu, et William J. Parnell. « Soft phononic crystals with deformation-independent band gaps ». Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences 473, no 2200 (avril 2017) : 20160865. http://dx.doi.org/10.1098/rspa.2016.0865.

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Soft phononic crystals have the advantages over their stiff counterparts of being flexible and reconfigurable. Normally, the band gaps of soft phononic crystals will be modified after deformation due to both geometric and constitutive nonlinearity. Indeed these are important properties that can be exploited to tune the dynamic properties of the material. However, in some instances, it may be that one wishes to deform the medium while retaining the band gap structure. A special class of soft phononic crystals is described here with band gaps that are independent or almost-independent of the imposed mechanical deformation, which enables the design of phononic crystals with robust performance. This remarkable behaviour originates from transformation elasticity theory, which leaves the wave equation and the eigenfrequencies invariant after deformation. The necessary condition to achieve such a property is that the Lagrangian elasticity tensor of the hyperelastic material should be constant, i.e. independent of deformation. It is demonstrated that incompressible neo-Hookean materials exhibit such a unique property. Semilinear materials also possess this property under special loading conditions. Phononic crystals composed of these two materials are studied theoretically and the predictions of invariance, or the manner in which the response deviates from invariance, are confirmed via numerical simulation.
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24

Meyer, Ralf. « Effect of Grain Boundaries on the Vibrational Properties of Phononic Crystals ». MRS Advances 2, no 28 (2017) : 1463–68. http://dx.doi.org/10.1557/adv.2017.177.

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ABSTRACTThe influence of grain boundaries on the vibrational properties of nanoscale phononic crystals is studied with the help of molecular dynamics simulations. The low-frequency vibrational density of states of phononic crystals made from single crystal and polycrystalline silicon are derived from the simulations. The results show that the presence of grain boundaries leads to an increase of the density of states and a change of its peak structure at low frequencies. Calculations of the band structure of the model systems along one direction reveal that the grain boundaries affect the bands differently and in a non-uniform manner.
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25

Song, Zhuo Fei, Qiang Song Wang et Ya Qiang Tian. « Band Gap Property of Three-Component one-Dimensional Quasiperiodic Phononic Crystals ». Advanced Materials Research 197-198 (février 2011) : 544–47. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.544.

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Studied the ABAC pattern quasiperiodic phononic crystal properties by transfer matrix method, The results show that the frequency of ABAC pattern quasiperiodic phononic crystal initial band gap is lower than AB and AC pattern and the band gap is wider, simultaneously produce strongly localized resonant modes in the first band gap, frequency and quantity of the localized resonant modes are different with different parameters of material C. These properties are useful to the fabrication of the acoustic or elastic wave filters.
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26

Hao, Qing, Dongchao Xu et Hongbo Zhao. « Systematic Studies of Periodically Nanoporous Si Films for Thermoelectric Applications ». MRS Proceedings 1779 (2015) : 27–32. http://dx.doi.org/10.1557/opl.2015.707.

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ABSTRACTAs the major heat carriers in dielectrics and semiconductors, phonons are strongly scattered by boundaries and interfaces at the nanoscale, which can lead to a significantly reduced lattice thermal conductivity kL. In recent years, such phonon size effects have been used to enhance the thermoelectric performance of various nanostructured materials. With dramatically reduced kL and bulk-like electrical properties, high thermoelectric performance has been demonstrated for nanoporous Si films at room temperature. Despite these encouraging results, however, challenges still exist in the theoretical explanation of the observed low kL values. Existing studies mainly attribute the observed low kL to phononic effects and/or amorphous pore edges. These two effects can be separated when the specific heat of the film can be measured along with kL to provide more insight into the phonon dispersion modification. In this work, both the specific heat and k of a suspended nanoporous Si film is extracted from the 3ω measurements. The result is compared to the reported kL values of various porous Si films. The influence of employed phonon mean free path spectrum on the data analysis is discussed.
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27

Wan, Ruonan, et Yong Li. « Transmission Properties of One-Dimensional Galois Phononic Crystals ». Acoustical Physics 68, no 4 (août 2022) : 343–47. http://dx.doi.org/10.1134/s1063771022040121.

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28

Lu, Y. « Optical Properties of an Ionic-Type Phononic Crystal ». Science 284, no 5421 (11 juin 1999) : 1822–24. http://dx.doi.org/10.1126/science.284.5421.1822.

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29

Quan, Chai, Zhang Jianzhong, Lin Sijing, Sun Weimin, Kang Chong et Yuan Libo. « Bandgap properties of phononic crystals withL-shape scatters ». Physica Scripta 88, no 2 (1 août 2013) : 025007. http://dx.doi.org/10.1088/0031-8949/88/02/025007.

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30

Sevinçli, Hâldun, et Cem Sevik. « Electronic, phononic, and thermoelectric properties of graphyne sheets ». Applied Physics Letters 105, no 22 (décembre 2014) : 223108. http://dx.doi.org/10.1063/1.4902920.

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31

Rietschel, H., J. Fink, E. Gering, F. Gompf, N. Nocker, L. Pintschovius, B. Renker, W. Reichardt, H. Schmidt et W. Weber. « Electronic and phononic properties of high-Tc superconductors ». Physica C : Superconductivity 153-155 (juin 1988) : 1067–71. http://dx.doi.org/10.1016/0921-4534(88)90201-8.

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32

Oseev, A., M. Zubtsov et R. Lucklum. « Gasoline properties determination with phononic crystal cavity sensor ». Sensors and Actuators B : Chemical 189 (décembre 2013) : 208–12. http://dx.doi.org/10.1016/j.snb.2013.03.072.

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33

Garus, S., W. Sochacki et M. Bold. « Transmission Properties of Two-Dimensional Chirped Phononic Crystal ». Acta Physica Polonica A 135, no 2 (février 2019) : 153–56. http://dx.doi.org/10.12693/aphyspola.135.153.

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34

Mukhin, Nikolay, Mykhailo Kutia, Alexander Aman, Ulrike Steinmann et Ralf Lucklum. « Two-Dimensional Phononic Crystal Based Sensor for Characterization of Mixtures and Heterogeneous Liquids ». Sensors 22, no 7 (6 avril 2022) : 2816. http://dx.doi.org/10.3390/s22072816.

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We show new approaches to developing acoustic liquid sensors based on phononic crystals. The proposed phononic crystal integrates fluidic elements. A solid block with periodic cylindrical holes contains a defect—a liquid-filled cylindrical cavity. We pay attention to acoustic excitation and the readout of the axisymmetric cylindrical resonator eigenmode of the liquid-filled defect in the middle of the phononic crystal structure. This mode solves the challenge of mechanical energy losses due to liquid viscosity. We also analyze the coupling effects between oscillations of liquid and solid systems and consider coupling issues between piezoelectric transducers and the liquid-filled cavity resonator. The numerical simulation of the propagation of acoustic waves through the phononic crystal sensor was carried out in COMSOL Multiphysics Software. The phononic crystal was made of stainless steel with mechanically drilled holes and was fabricated for experimental verification. We show that a tuning of the solid–liquid vibrational modes coupling is the key to an enhanced level of sensitivity to liquid properties. Besides (homogeneous) water–propanol mixtures, experimental studies were carried out on (disperse) water–fuel emulsions.
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Wang, Xujun, Quanjie Wang, Xinyu Liu, Zixuan Huang et Xiangjun Liu. « Phosphorene grain boundary effect on phonon transport and phononic applications ». Nanotechnology 33, no 26 (8 avril 2022) : 265704. http://dx.doi.org/10.1088/1361-6528/ac60db.

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Abstract Grain boundaries (GBs) widely exist in black phosphorene (BP), which plays a vital role in determining the properties of 2D materials. Significant GB effect on the thermal boundary resistance in BP structures is found by using molecular dynamics calculations and lattice dynamic analysis. A remarkably high interface thermal resistance is observed. By analyzing the strain distribution and phonon vibrational spectra, we reveal this high thermal resistance originates from phonon localization and strong phonon boundary scattering induced by the local stress at the GB area. Particularly, it is interesting to find that the partial phonon modes display weak localization when GBs present. The fraction of atoms participating in a particular phonon vibrational mode has been quantified through the calculation of phonon participation ratio. In addition, the thermal boundary resistance is found size-dependent, which further induces interesting thermal rectification effect in the BP structures. A high rectification ratio is obtained by adjusting the structural length and temperature bias. These findings provide a through insight into the GB effects on individual phonon mode transmission across the GBs, and highlight that the GB effect is an important factor and should be taken into account for the applications of BP-based phononic devices.
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Cruz-Irisson, Miguel, et Chu Min Wang. « Electronic and Vibrational Properties of Porous Silicon ». Journal of Nano Research 5 (février 2009) : 153–60. http://dx.doi.org/10.4028/www.scientific.net/jnanor.5.153.

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For ordered porous silicon, the Born potential and phonon Green’s functions are used to investigate its Raman response, while the electronic band structure and dielectric function are studied by means of a sp3s* tight-binding supercell model, in which periodical pores are produced by removing columns of atoms along [001] direction from a crystalline Si structure and the pores surfaces are passivated by hydrogen atoms for the electronic band structure calculations. This supercell model emphasizes the interconnection between silicon nanocrystals, delocalizing the electronic and phononic states. However, the results of both elementary excitations show a clear quantum confinement signature, which is contrasted with that of nanowire systems. In addition, ab-initio calculations of small supercells are performed in order to verify the tight-binding results. The calculated dielectric function is compared with experimental data. Finally, a shift of the highest-frequency Raman peak towards lower energy is observed, in agreement with the experimental data.
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Liu, Junyi, Hanbei Guo et Ting Wang. « A Review of Acoustic Metamaterials and Phononic Crystals ». Crystals 10, no 4 (15 avril 2020) : 305. http://dx.doi.org/10.3390/cryst10040305.

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As a new kind of artificial material developed in recent decades, metamaterials exhibit novel performance and the promising application potentials in the field of practical engineering compared with the natural materials. Acoustic metamaterials and phononic crystals have some extraordinary physical properties, effective negative parameters, band gaps, negative refraction, etc., extending the acoustic properties of existing materials. The special physical properties have attracted the attention of researchers, and great progress has been made in engineering applications. This article summarizes the research on acoustic metamaterials and phononic crystals in recent decades, briefly introduces some representative studies, including equivalent acoustic parameters and extraordinary characteristics of metamaterials, explains acoustic metamaterial design methods, and summarizes the technical bottlenecks and application prospects.
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AHMAD, FAREED, et SUNDAR SINGH. « Graphene and its Phononics : A Review ». Journal of Ultra Scientist of Physical Sciences Section B 33, no 5 (22 octobre 2021) : 30–38. http://dx.doi.org/10.22147/jusps-b/330501.

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Graphene, a unique allotrope of carbon, has garnered a huge amount of attention amongst researchers as its unique properties and promising applications in various real-life domains like in efficient batteries, solar cells, medicinal technologies, environmental remediation, circuit boards, lighting and display, and anti-corrosion has resulted in its commercial exploitation and implementation in everyday life. Since 2004 graphene has been one of the most beautiful scientific and technological achievements. The unique electronic cloud forming the bond between different carbon atoms in graphene leads to several inquisitive questions raised in the field of quantum physics. Till now graphene has been exploited for its electronic and optical properties but new research has shown that phononic properties of graphene will lead to the development of “killer” practical applications in the future. In this review article we have explored the structure, properties and the phononics of graphene with a special reference to few-layer graphene (FLG) and graphene Thermal Interface Materials (TIMs).
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Kahlouche, Ahmed, Mounir Bouras et Abdessalem Hocini. « Design of a Thickness Sensor Based on a One-Dimensional Phononic Crystal ». Instrumentation Mesure Métrologie 21, no 3 (30 juin 2022) : 109–12. http://dx.doi.org/10.18280/i2m.210303.

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Nowadays, sensor technology has attracted great interest in various domains. In this ‎work, we have analyzed a one dimensional phononic crystal made by the stack of N bilayers of ‎‎(LiNbO3/SiO2). The sensor design consists of a one dimensional phononic crystal structure with a ‎defect layer inserted in the middle. Using the Transfer Matrix Method (TMM), the transmission ‎spectrums of acoustic waves are calculated and plotted. In this work, we are interested in the ‎resonance peak that is transmitted inside the phononic band gap. The results obtained show clearly that the resonant frequency of the measured ‎transmission peak is very sensitive to the layer defect properties. This proves that such structure offers a new platform for sensing ‎applications.
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Jin, Yabin, Bahram Djafari-Rouhani et Daniel Torrent. « Gradient index phononic crystals and metamaterials ». Nanophotonics 8, no 5 (23 février 2019) : 685–701. http://dx.doi.org/10.1515/nanoph-2018-0227.

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AbstractPhononic crystals and acoustic metamaterials are periodic structures whose effective properties can be tailored at will to achieve extreme control on wave propagation. Their refractive index is obtained from the homogenization of the infinite periodic system, but it is possible to locally change the properties of a finite crystal in such a way that it results in an effective gradient of the refractive index. In such case the propagation of waves can be accurately described by means of ray theory, and different refractive devices can be designed in the framework of wave propagation in inhomogeneous media. In this paper we review the different devices that have been studied for the control of both bulk and guided acoustic waves based on graded phononic crystals.
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Han, Dan, Xiaoheng Yang, Mu Du, Gongming Xin, Jingchao Zhang, Xinyu Wang et Lin Cheng. « Improved thermoelectric properties of WS2–WSe2 phononic crystals : insights from first-principles calculations ». Nanoscale 13, no 15 (2021) : 7176–92. http://dx.doi.org/10.1039/d0nr09169c.

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Mortazavi, Bohayra, et Xiaoying Zhuang. « Low and Anisotropic Tensile Strength and Thermal Conductivity in the Single-Layer Fullerene Network Predicted by Machine-Learning Interatomic Potentials ». Coatings 12, no 8 (12 août 2022) : 1171. http://dx.doi.org/10.3390/coatings12081171.

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In the latest ground-breaking experimental advancement (Nature (2022), 606, 507), zero-dimensional fullerenes (C60) have been covalently bonded to form single-layer two-dimensional (2D) fullerene network, namely quasi-hexagonal-phase fullerene (qHPC60). Motivated by the aforementioned accomplishment, in this communication, for the first time, we explore the phononic and mechanical properties of the qHPC60 monolayer, employing state-of-the-art machine-learning interatomic potentials. By employing an efficient passive-training methodology, the thermal and mechanical properties were examined with an ab-initio level of accuracy using the classical molecular dynamics simulations. Predicted phonon dispersion confirmed the desirable dynamical stability of the qHPC60 monolayer. Room temperature lattice thermal conductivity is predicted to be ultralow and around 2.9 (5.7) W/m·K along the x(y) directions, which are by three orders of magnitude lower than that of the graphene. Close to the ground state and at room temperature, the ultimate tensile strength of the qHPC60 monolayer along the x(y) directions is predicted to be 7.0 (8.8) and 3.3 (4.2) GPa, respectively, occurring at corresponding strains of around 0.07 and 0.029, respectively. The presented computationally accelerated first-principles results confirm highly anisotropic and remarkably low tensile strength and phononic thermal conductivity of the qHPC60 fullerene network nanosheets.
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Fang, Lu, Tamia Willliam, Kofi W. Adu et Mauricio Terrones. « Phenomenological Modeling of Confined Phonon States in TMD Quantum Dots ». MRS Advances 3, no 6-7 (2018) : 339–44. http://dx.doi.org/10.1557/adv.2018.123.

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ABSTRACTSeveral reports have shown band-gap tuning in TMDs, from indirect band gap in the bulk material to a direct gap in single layer due to the absence of interlayer coupling. This unique property stems from the modified electronic states. The phononic properties are extremely modified as well, due to layered effect and quantum size effect. There are several reports on layered effect; however, reports on the confined phonon states in these structures are limited. Thus, we present a preliminary studies of the confined phonon states in TMDs (WS2 and MoS2) quantum dots, and elucidate on the evolution of the phonon lineshape with diameter using a phenomenological model with an envelop function that truncates the phonon wave at the surface of the quantum dot. Furthermore, we delineate the layered effect from the quantum size effect in the phonon lineshape of WS2 and MoS2.
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Pakizeh, Esmaeil, Jaafar Jalilian et Mahnaz Mohammadi. « Electronic, optical and thermoelectric properties of Fe2ZrP compound determined via first-principles calculations ». RSC Advances 9, no 44 (2019) : 25900–25911. http://dx.doi.org/10.1039/c9ra04736k.

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In this study, based on the density functional theory and semi-classical Boltzmann transport theory, we investigated the structural, thermoelectric, optical and phononic properties of the Fe2ZrP compound.
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Xingguo, Wang, Shu Haisheng et Zhang Lei. « Vibration and acoustic insulation properties of generalized phononic crystals ». European Physical Journal Applied Physics 94, no 3 (juin 2021) : 30902. http://dx.doi.org/10.1051/epjap/2021210036.

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Based on the previous studies, the concept of generalized phononic crystals (GPCs) is further introduced into the cylindrical shell structures, and a type of cylindrical shells of generalized phononic crystals (CS-GPCs) is constructed. Subsequently, the structure field and acoustic-structural coupled field of that composite cylindrical shells are examined respectively in this paper. Considering the Bloch theorem is not capable of explaining the generalized periodic situation existing in this structure field, a new analysis method involving transferring matrix eigenvalue based on the mechanical state vector is proposed to calculate the energy band structure. Through observing the energy band structure, an obvious wave band gap is obtained when the elastic wave propagates in the CS-GPCs for modes with different order, whose forming mechanism includes two aspects, i.e., the wave front expansion effect and the Bragg scattering effect. In addition, we further explore the related influences of the longitudinal wave mode and shear wave mode in structure on these band gaps, and some conclusions are illustrated. For acoustic-structural coupled field, the expressions of the acoustic transmission coefficients for different modes are built, and the frequency responses are numerically calculated to verify the band gap characteristics of the CS-GPCs. Furthermore, the acoustic pressure distribution of the internal and external acoustic fields is also analyzed in detail, and the influence laws of the parameters (offset distance and frequency) of the line source on acoustical pressure distribution and its directivity are explored.
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Demin, A., B. Damdinov et Y. Baloshin. « Numeric Modeling of Phononic Crystal with Time-Dependent Properties ». IOP Conference Series : Materials Science and Engineering 704 (13 décembre 2019) : 012017. http://dx.doi.org/10.1088/1757-899x/704/1/012017.

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Najmaei, Sina, Chinedu E. Ekuma, Adam A. Wilson, Asher C. Leff et Madan Dubey. « Dynamically reconfigurable electronic and phononic properties in intercalated HfS2 ». Materials Today 39 (octobre 2020) : 110–17. http://dx.doi.org/10.1016/j.mattod.2020.04.030.

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Yao, Yuanwei, Zhilin Hou et Youyan Liu. « The propagating properties of the hetero-structure phononic waveguide ». Journal of Physics D : Applied Physics 39, no 24 (1 décembre 2006) : 5164–68. http://dx.doi.org/10.1088/0022-3727/39/24/011.

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Cao Yong-Jun, Dong Chun-Hong et Zhou Pei-Qin. « Transmission properties of one-dimensional qusi-periodical phononic crystal ». Acta Physica Sinica 55, no 12 (2006) : 6470. http://dx.doi.org/10.7498/aps.55.6470.

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Wang, Hongyun, Heow Pueh Lee et Wei Xu. « Bandgap Properties of Two-Layered Locally Resonant Phononic Crystals ». International Journal of Applied Mechanics 12, no 07 (août 2020) : 2050075. http://dx.doi.org/10.1142/s1758825120500751.

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Multi-layered locally resonant phononic crystals (LRPCs) with wider and multiple bandgaps (BGs) in low frequency range and small size of the unit cell have promising applications in noise and vibration controls. In this paper, a 2D two-layered ternary LRPC consisting of a periodical array of cylindrical inclusions embedded in an epoxy matrix is investigated by the finite element method (FEM), where the inclusion is comprised of two coaxial cylindrical steel cores with rubber coating. It is found that the size of the inclusion of the 2D two-layered ternary LRPC has significant effects on the BG properties. With the increase of the core radius and coating thickness, the first BG would shift to lower frequency range with its width decreasing, and the second BG width would become wider until the third BG appears. Especially, with the increase of the coating thickness, more bands and BGs would appear in the lower frequency range. Based on the formation mechanisms of the BGs, several mass-spring models to predict the frequencies of the first two BG edges are developed. The results calculated by these mass-spring models are in good agreement with those by the FEM except for the upper edge frequency of the second BG when the rubber coating thickness exceeds a certain value and the third BG is opened up. These proposed mass-spring models would allow for quick pre-estimation of the resonance frequencies, and facilitate the selection of possible parameters for the wider and lower frequency BGs to obtain the desired attenuation bands. The studies would also benefit the design of multiple BGs for some device applications.
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