Quasi-two-dimensional acoustic metamaterials

2014 ◽  
Author(s):  
D. Torrent ◽  
R. Graciá-Salgado ◽  
V. M. García-Chocano ◽  
F. Cervera ◽  
J. Sánchez-Dehesa
Keyword(s):  
Two Dimensional ◽  
Acoustic Metamaterials

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.

Negative and density-near-zero acoustic metamaterials based on quasi-two-dimensional phononic crystals

2013 ◽  
Vol 133 (5) ◽  
pp. 3373-3373
Author(s):  
Victor Manuel Garcia-Chocano ◽  
Rogelio Graciá-Salgado ◽  
Daniel Torrent ◽  
José Sánchez-Dehesa
Keyword(s):  
Phononic Crystals ◽  
Two Dimensional ◽  
Acoustic Metamaterials

scholarly journals Wave propagation in two-dimensional anisotropic acoustic metamaterials of K4 topology

Wave Motion ◽  
2015 ◽  
Vol 58 ◽  
pp. 101-116 ◽  
Author(s):  
A.S. Fallah ◽  
Y. Yang ◽  
R. Ward ◽  
M. Tootkaboni ◽  
R. Brambleby ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Two Dimensional ◽  
Acoustic Metamaterials

scholarly journals Simulation of Isotropic Acoustic Metamaterials

2016 ◽  
Vol 65 ◽  
pp. 43-52
Author(s):  
S.M. Premarathna ◽  
K.A.I.L. Wijewardena Gamalath
Keyword(s):  
Normal Incidence ◽  
Wave Pattern ◽  
Transverse Magnetic ◽  
Normal Space ◽  
Two Dimensional ◽  
Acoustic Metamaterials ◽  
Transverse Magnetic Mode ◽  
Multiple Cycle ◽  
Leapfrog Scheme ◽  
The Waves

The model use to study electromagnetic metamaterials in transverse electric mode was modified to study the pressure distribution in an acoustic metamaterial in a two dimensional geometry. An electromagnetic wave of 30 GHz in transverse magnetic mode at normal incidence propagating through a two dimensional isotropic semi infinite double negative metamaterial slab of 640×830 cells embedded in free space with low loss damping frequency 108s-1was studied by finite difference time dependent method with Yee’s algorithm with an explicit leapfrog scheme. The multiple cyclem-n-mpulses generating beams were used as sources. The simulations for refractive indices n=-1 and n=-16 at different time steps are presented. For n=-1, the sub-wavelength imaging is apparent, diverging the waves from source into two sources, one inside and the other outside the slab. The reverse propagation is much more significant for showing that the group velocity is much larger inside the metamaterial by the closely packed wave front, making the continuation of the wave pattern much more significant through the metamaterial into the normal space.

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