Band Gaps of a Two-Dimensional Periodic Graphenelike Structure

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Zi-Gui Huang ◽  
Chun-Fu Su
Keyword(s):  
Acoustic Wave ◽  
Band Gap ◽  
Phononic Crystal ◽  
Chain Structure ◽  
Gap Effect ◽  
Two Dimensional ◽  
Acoustic Wave Propagation ◽  
Bloch’S Theorem ◽  
Acoustic Wave Device ◽  
Wave Device

This study constructs a new phononic crystal acoustic wave device that adopts a graphenelike structure and is composed of piezoelectric zinc oxide (ZnO) material. We employed the finite-element method to determine periodic boundary conditions. Following Bloch's theorem, we analyzed the acoustic wave propagation of the proposed graphenelike structure in the frequency domain to understand the band gap effect and oscillation behavior. We also investigated the band gap variation and modal distortion tendencies of the piezoelectric ZnO material in the two-dimensional graphenelike structure under the condition of changing chain structure diameters and bonding rod widths between the atoms columns to develop an optimal acoustic wave device.

Analysis of surface acoustic wave propagation in a two-dimensional phononic crystal

2012 ◽  
Vol 112 (2) ◽  
pp. 023524 ◽  
Author(s):  
Yong Li ◽  
Zhilin Hou ◽  
Mourad Oudich ◽  
M. Badreddine Assouar
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Phononic Crystal ◽  
Two Dimensional ◽  
Acoustic Wave Propagation

scholarly journals Two-Dimensional Composite Acoustic Metamaterials of Rectangular Unit Cell from Pentamode to Band Gap

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1457
Author(s):  
Qi Li ◽  
Ke Wu ◽  
Mingquan Zhang
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Band Gap ◽  
Unit Cell ◽  
The Other ◽  
Two Dimensional ◽  
Acoustic Metamaterials ◽  
Acoustic Wave Propagation ◽  
Theoretical Support ◽  
Unit Cells

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.

scholarly journals Surface Acoustic Wave Propagation in Two-dimensional Phononic Crystal on Piezoelectric Substrate

2014 ◽  
Vol 14 (2) ◽  
pp. 5-12
Author(s):  
Sergey Sergeevich Yankin ◽  
◽  
Abdelkrim Talbi ◽  
Jean-Claude Gerbedoen ◽  
Vladimir Leonidovich Preobrazhensky ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Phononic Crystal ◽  
Two Dimensional ◽  
Acoustic Wave Propagation ◽  
Piezoelectric Substrate

Electrical Performances of a Surface Acoustic Wave Device With Inter-Digital Transducers Electrodes in Local Resonances

2020 ◽  
Vol 143 (1) ◽  
Author(s):  
Rafik Serhane ◽  
Nabila Belkhelfa ◽  
Fayçal Hadj-Larbi ◽  
Yamna Bakha ◽  
Sidi Mohammed Merah
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Phononic Crystal ◽  
Element Analysis ◽  
Resonance Modes ◽  
Aspect Ratios ◽  
Saw Devices ◽  
Digital Transducers ◽  
Acoustic Wave Device ◽  
Wave Device

Abstract In this paper, we investigate numerically the coupling of the Rayleigh mode with the micro-wall resonance modes in inter-digital transducers (IDTs) electrodes of surface acoustic wave (SAW) devices. We perform a finite element analysis (FEA) of the SAW features using an implemented model using comsol Multiphysics® software. The SAW structure comprises identical transmitter and receiver IDTs electrodes, with different electrode heights (he). The proposed FEA study is based on the extraction of reflection (S11) and transmission (S21) coefficients of the SAW device. The IDTs are considered to be a micro-wall phononic crystal acting as local resonators at frequencies inside the SAW passband. The locally resonance gap is strongly dependent on the he value, and S11 and S21 parameters are affected by the SAW energy absorption in the IDTs system. We have chosen two he values (0.5 and 3 µm) to study low and high aspect ratios of micro-walls, corresponding respectively to Bragg-type and resonance-type bandgaps appearing near the SAW central frequency. At the SAW resonance frequency, the return (S11) and the insertion (S21) losses are reduced. S21 is reduced by 12.73 and 18.49 dB for he = 0.5 and 3 µm, respectively, accompanied by an increase in the quality factor, and S11 parameter is reduced by 1.357 and 4.98 dB for he = 0.5 and 3 µm, respectively.

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