Recent advances in the negative refraction of longitudinal waves in an elastic phononic crystal

2011 ◽  
Author(s):  
A.-C. Hladky-Hennion ◽  
C. Croenne ◽  
K.R. Olympio ◽  
J. Vasseur ◽  
B. Dubus ◽  
...  
Keyword(s):  
Negative Refraction ◽  
Phononic Crystal ◽  
Longitudinal Waves ◽  
Recent Advances

Negative refraction of longitudinal waves in an elastic phononic crystal

2010 ◽  
Author(s):  
C. Croenne ◽  
A.-C. Hladky-Hennion ◽  
J. Vasseur ◽  
B. Dubus ◽  
M. Bavencoffe ◽  
...  
Keyword(s):  
Negative Refraction ◽  
Phononic Crystal ◽  
Longitudinal Waves

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

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

Acoustic Band Gap Extension in One-Dimensional Solid/Fluid Phononic Crystal Heterostructure

2014 ◽  
Vol 22 (04) ◽  
pp. 1450010 ◽  
Author(s):  
Xu Yang Xiao ◽  
Run Ping Chen
Keyword(s):  
Band Gap ◽  
Phononic Crystal ◽  
Low Frequency ◽  
Wide Band ◽  
Normal Incidence ◽  
Wide Band Gap ◽  
Longitudinal Waves ◽  
One Dimensional ◽  
Solid Media ◽  
Fluid Media

The propagation of elastic longitudinal waves in one-dimensional (1D) phononic crystals (PNCs) consisting of alternating solid and fluid media is comprehensively analyzed in theory. We demonstrate the acoustic band gap (ABG) structure determined by the dispersion relation for longitudinal waves at normal incidence. According to the band structure, we design a sub-PNC by setting a reasonable thickness ratio of fluid and solid media, and then form a phononic heterostructure by merging this PNC and other PNC designed in advance. We have shown that the wide band gap exists in such a phononic heterostructure for elastic longitudinal waves at normal incidence. For oblique incidence, the wide band gap shifts towards high frequency regions, meanwhile a low-frequency band gap is split.

Frequency Tunable Phononic Crystal Flat Lens for Subwavelength Imaging

2021 ◽  
Author(s):  
Hrishikesh Danawe ◽  
Serife Tol
Keyword(s):  
Negative Refraction ◽  
Phononic Crystal ◽  
Ultrasonic Inspection ◽  
Aluminum Plate ◽  
Lens Design ◽  
Lattice Arrangement ◽  
Dispersion Branch ◽  
Small Spot ◽  
Flat Lens ◽  
Frequency Tunable

Abstract In this paper, we present a thickness-contrast based flat lens for subwavelenth imaging in an aluminum plate. The lens is made of phononic crystal (PC) with a triangular lattice arrangement of through holes drilled over an aluminum plate. Subwave-length imaging is achieved by exploiting the concept of negative refraction of A0 plate mode for the optical dispersion branch of the PC. The wavenumbers are matched at a design frequency by creating a step change in the thickness of the PC-lens and host plate. The thickness-contrast results in refractive index of minus one at the interface of the lens and host plate. Negative refraction-based lens overcomes the diffraction limit and enables focusing of flexural waves in an area less than a square wavelength. We validate the flat lens design at a single design frequency through numerical simulations and experiments. Further, we numerically demonstrate the tunability of the lens design over a broadband frequency range by modifying the thickness-contrast between the lens and host plate. The proposed frequency tunable design is promising for many applications such as ultrasonic inspection, tetherless energy transfer, and energy harvesting, where the localization of wave energy in a small spot is desirable.

Analysis of elastic waves transmitted through a 2-D phononic crystal exhibiting negative refraction

2011 ◽  
Vol 58 (1) ◽  
pp. 178-186 ◽  
Author(s):  
Charles Croënne ◽  
Bruno Morvan ◽  
Jérôme Vasseur ◽  
Bertrand Dubus ◽  
Anne-Christine Hladky-Hennion
Keyword(s):  
Elastic Waves ◽  
Negative Refraction ◽  
Phononic Crystal

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

Negative refraction experiments with guided shear-horizontal waves in thin phononic crystal plates

2011 ◽  
Vol 98 (1) ◽  
pp. 011909 ◽  
Author(s):  
Min Kyung Lee ◽  
Pyung Sik Ma ◽  
Il Kyu Lee ◽  
Hoe Woong Kim ◽  
Yoon Young Kim
Keyword(s):  
Negative Refraction ◽  
Phononic Crystal ◽  
Shear Horizontal
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