scholarly journals Two-Dimensional Phononic Crystals With Acoustic-Band Negative Refraction

2016 ◽  
Author(s):  
Hossein Sadeghi ◽  
Sia Nemat-Nasser
Keyword(s):  
Negative Refraction ◽  
Phononic Crystal ◽  
Longitudinal Mode ◽  
Negative Energy ◽  
Effective Density ◽  
Pass Band ◽  
Anisotropy Ratio ◽  
Two Dimensional ◽  
Low Frequencies ◽  
High Anisotropy

A two-dimensional phononic crystal (PC) can exhibit longitudinal-mode negative energy refraction on its lowest (acoustical) frequency pass band. The effective elastodynamic properties of a typical PC are calculated and it is observed that the components of the effective density tensor can achieve negative values at certain low frequencies on the acoustical branches for the longitudinal-mode pass-band, and that negative refraction may be accompanied by either positive or negative effective density. Furthermore, such a PC has a high anisotropy ratio at certain low frequencies, offering potential for application to acoustic cloaking where effective material anisotropy is essential.

Negative refraction of zero order flexural Lamb waves through a two-dimensional phononic crystal

2010 ◽  
Vol 97 (12) ◽  
pp. 121919 ◽  
Author(s):  
J. Pierre ◽  
O. Boyko ◽  
L. Belliard ◽  
J. O. Vasseur ◽  
B. Bonello
Keyword(s):  
Negative Refraction ◽  
Lamb Waves ◽  
Phononic Crystal ◽  
Zero Order ◽  
Two Dimensional

scholarly journals Negative Refraction of Acoustic Waves in a Two-Dimensional Phononic Crystal via FDTD Simulation

2009 ◽  
Vol 50 (5) ◽  
pp. 1004-1007 ◽  
Author(s):  
Tomoyuki Kurose ◽  
Kenji Tsuruta ◽  
Chieko Totsuji ◽  
Hiroo Totsuji
Keyword(s):  
Acoustic Waves ◽  
Negative Refraction ◽  
Phononic Crystal ◽  
Fdtd Simulation ◽  
Two Dimensional

Acoustic collimating beams by negative refraction in two-dimensional phononic crystal

2009 ◽  
Vol 105 (11) ◽  
pp. 116105 ◽  
Author(s):  
Zhaojian He ◽  
Yaofu Heng ◽  
Shasha Peng ◽  
Yiqun Ding ◽  
Manzhu Ke ◽  
...  
Keyword(s):  
Negative Refraction ◽  
Phononic Crystal ◽  
Two Dimensional

Negative Refraction of Ultrasound in a Two-Dimensional Prism-Shaped Phononic Crystal

2016 ◽  
Vol 66 (7) ◽  
pp. 930-935
Author(s):  
Yoon Mi KIM ◽  
Kang Il LEE* ◽  
Hwi Suk KANG ◽  
Suk Wang YOON
Keyword(s):  
Negative Refraction ◽  
Phononic Crystal ◽  
Two Dimensional

Wave bandgap formation and its evolution in two-dimensional phononic crystals composed of rubber matrix with periodic steel quarter-cylinders

2018 ◽  
Vol 32 (04) ◽  
pp. 1850037 ◽  
Author(s):  
Peng Li ◽  
Guan Wang ◽  
Dong Luo ◽  
Xiaoshan Cao
Keyword(s):  
Finite Element Method ◽  
Phononic Crystal ◽  
Phononic Crystals ◽  
Rubber Matrix ◽  
Two Dimensional ◽  
The Finite Element Method ◽  
Defect States ◽  
Low Frequencies ◽  
High Frequencies ◽  
Inner Region

The band structure of a two-dimensional phononic crystal, which is composed of four homogenous steel quarter-cylinders immersed in rubber matrix, is investigated and compared with the traditional steel/rubber crystal by the finite element method (FEM). It is revealed that the frequency can then be tuned by changing the distance between adjacent quarter-cylinders. When the distance is relatively small, the integrality of scatterers makes the inner region inside them almost motionless, so that they can be viewed as a whole at high-frequencies. In the case of relatively larger distance, the interaction between each quarter-cylinder and rubber will introduce some new bandgaps at relatively low-frequencies. Lastly, the point defect states induced by the four quarter-cylinders are revealed. These results will be helpful in fabricating devices, such as vibration insulators and acoustic/elastic filters, whose band frequencies can be manipulated artificially.

Negative refraction of longitudinal waves in a two-dimensional solid-solid phononic crystal

2011 ◽  
Vol 83 (5) ◽  
Author(s):  
C. Croënne ◽  
E. D. Manga ◽  
B. Morvan ◽  
A. Tinel ◽  
B. Dubus ◽  
...  
Keyword(s):  
Negative Refraction ◽  
Phononic Crystal ◽  
Two Dimensional ◽  
Longitudinal Waves
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