Tunable Multimode Filtering of Solid Acoustic Waves in a Three-Component Phononic Crystal Slab

2010 ◽  
Vol 150-151 ◽  
pp. 1625-1639
Author(s):  
Jing Li
Keyword(s):  
Longitudinal Wave ◽  
Acoustic Waves ◽  
Negative Refraction ◽  
Phononic Crystal ◽  
Wave Mode ◽  
Geometrical Parameters ◽  
Transverse Waves ◽  
Propagation Behavior ◽  
The Individual ◽  
Negative Refractions

Using of the multiple scattering methods, we characterize the positive and negative multi-refraction and transmission properties of a solid-based phononic crystal composed of coated solid inclusions in view of its applications in tunable multimode filtering. The geometrical parameters are chosen so that a left-handed longitudinal wave mode and a right-handed transverse wave mode, are simultaneously obtained in this three-component phononic crystal. When multimode Gaussian beams are placed transmitting through the phononic crystal slab, both positive and negative refractions are observed. We then study the individual propagation behavior of different modes. The angle dependent transmission beams with different energy distributions are found at the other side of the slab. Transmitted transverse waves coming from different directions incidence finally walk together into four oriented beams. Meanwhile, longitudinal wave incidence with different directions behaves simply as negative refraction in the slab. A far-field longitudinal wave image can be achieved being excited by a longitudinal wave point source. The three-component phononic crystal slab thus can be served as an alternate in tunable multimode filtering devices.

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

scholarly journals Topological negative refraction of surface acoustic waves in a Weyl phononic crystal

Nature ◽  
2018 ◽  
Vol 560 (7716) ◽  
pp. 61-64 ◽  
Author(s):  
Hailong He ◽  
Chunyin Qiu ◽  
Liping Ye ◽  
Xiangxi Cai ◽  
Xiying Fan ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Negative Refraction ◽  
Phononic Crystal ◽  
Surface Acoustic Waves

Multiple-Transducer Scheme for Scanning Tomographic Acoustic Microscopy Using Transverse Waves

1997 ◽  
Vol 19 (4) ◽  
pp. 294-304
Author(s):  
Dae-Sik Ko
Keyword(s):  
Transverse Wave ◽  
Acoustic Waves ◽  
Mode Conversion ◽  
Tomographic Reconstruction ◽  
Wave Mode ◽  
Acoustic Microscopy ◽  
Good Resolution ◽  
Multiple Frequency ◽  
Transverse Waves ◽  
Resonance Frequencies

We propose a new type of multiple-transducer scheme with functions of multiple-angle and multiple-frequency tomography for scanning tomographic acoustic microscopy (STAM) using transverse waves. We review the data acquisition system and mode conversion of the acoustic waves for STAM and the multiple-angle and multiple-frequency tomography. Our multiple-transducer scheme has three insonification angles and three resonance frequencies in order to operate, in the transverse wave mode, multiple-angle and multiple frequency tomography for STAM. In order to evaluate the performance of our transducer scheme, we have simulated tomographic reconstruction with a back-and-forth propagation algorithm. Simulation results show that our multiple-transducer scheme is capable of obtaining good resolution with transverse wave mode and multiple-frequency tomography. We also show that our multiple-transducer scheme is an efficient rotation tool for a number of projections.

Negative refraction of transverse waves in an elastic phononic crystal

2008 ◽  
Author(s):  
Anne-Christine Hladky-Hennion ◽  
Jerome Vasseur ◽  
Bertrand Dubus ◽  
Bahram Djafari-Rouhani ◽  
Bruno Morvan ◽  
...  
Keyword(s):  
Negative Refraction ◽  
Phononic Crystal ◽  
Transverse Waves

scholarly journals Experimental demonstration of negative refraction with 3D locally resonant acoustic metafluids

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Benoit Tallon ◽  
Artem Kovalenko ◽  
Olivier Poncelet ◽  
Christophe Aristégui ◽  
Olivier Mondain-Monval ◽  
...  
Keyword(s):  
Experimental Data ◽  
Yield Stress ◽  
Multiple Scattering ◽  
Silicone Rubber ◽  
Acoustic Waves ◽  
Scattering Theory ◽  
Negative Refraction ◽  
Volume Fraction ◽  
Experimental Demonstration ◽  
Acoustic Beam

AbstractNegative refraction of acoustic waves is demonstrated through underwater experiments conducted at ultrasonic frequencies on a 3D locally resonant acoustic metafluid made of soft porous silicone-rubber micro-beads suspended in a yield-stress fluid. By measuring the refracted angle of the acoustic beam transmitted through this metafluid shaped as a prism, we determine the acoustic index to water according to Snell’s law. These experimental data are then compared with an excellent agreement to calculations performed in the framework of Multiple Scattering Theory showing that the emergence of negative refraction depends on the volume fraction $$\Phi$$ Φ of the resonant micro-beads. For diluted metafluid ($$\Phi =3\%$$ Φ = 3 % ), only positive refraction occurs whereas negative refraction is demonstrated over a broad frequency band with concentrated metafluid ($$\Phi =17\%$$ Φ = 17 % ).

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