Propagation of elastic waves in two-dimensional phononic crystals composed of viscoelastic materials

2017 ◽  
Vol 56 (3) ◽  
pp. 034101 ◽  
Author(s):  
Yukihiro Tanaka ◽  
Shunsuke Tomioka ◽  
Yukito Shimomura ◽  
Norihiko Nishiguchi
Keyword(s):  
Elastic Waves ◽  
Phononic Crystals ◽  
Two Dimensional ◽  
Viscoelastic Materials ◽  
Propagation Of Elastic Waves

Design and Fabrication of 2D Phononic Crystals in Surface Acoustic Wave Micro Devices

2005 ◽  
Author(s):  
Kebin Gu ◽  
Chien-Liu Chang ◽  
Jyh-Cherng Shieh
Keyword(s):  
Silicon Substrate ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Phononic Crystals ◽  
Two Dimensional ◽  
Central Frequency ◽  
Potential Applications ◽  
Specific Incident ◽  
Lift Off ◽  
Propagation Of Elastic Waves

In this paper, we present the design and fabrication of innovative phononic crystals integrated with two sets of interdigital (IDT) electrodes for frequency band selection of surface acoustic waves (SAW). The potential applications of this device include performance improvement of SAW micro-sensors, front-end components in RF circuitries, and directional receptions of high frequency acoustic waves. Analogous to the band-gap generated by photonic crystals, the phononic crystals, two dimensional repetitive structures composed of two different elastic materials, can prohibit the propagation of elastic waves with either specific incident angles or certain bandwidth. In this paper, the prohibited bandwidth has been verified by fabricating the phononic crystals between a micromachined SAW resonator and a receiver. Both the resonator and receiver are composed of IDT electrodes deposited and patterned on a thin piezoelectric layer. To confine the prohibited bandwidth on the order of hundred MHz, the diameter of the circular pores in phononic crystals is designed to be 6 micron and the aspect ratio of each pore is 3:1. To maximize the power transduction from IDT electrodes to SAW, the spacing between two inter-digits is one-fourth the wavelength of SAW. Specifically, the spacing ranges from 3.4 microns to 9.0 microns, depending on the central frequency. Both surface and bulk micromachining are employed and integrated to fabricate the crystals as well as SAW resonator and receiver altogether. Firstly, a 1.5-micron zinc oxide, which provides well-defined central frequency, is sputtered and patterned onto silicon substrate. Second, the IDT electrodes are evaporated and patterned by lift-off technique. Then the exposed silicon substrate is etched using DRIE to generate two dimensional phononic crystals. To tune the prohibited SAW bandwidth, the crystal pores are filled with copper or nickel by electroless plating. The insertion loss of the fabricated devices is characterized and is found to agree with simulation results.

Localisation of elastic waves in two-dimensional randomly disordered solid phononic crystals

2010 ◽  
Vol 20 (1) ◽  
pp. 104-121 ◽  
Author(s):  
A-Li Chen ◽  
Yue-Sheng Wang ◽  
Jian-Bao Li ◽  
Chuanzeng Zhang
Keyword(s):  
Elastic Waves ◽  
Phononic Crystals ◽  
Two Dimensional

Out-of-plane propagation of elastic waves in two-dimensional phononic band-gap materials

2003 ◽  
Vol 67 (6) ◽  
Author(s):  
M. Wilm ◽  
A. Khelif ◽  
S. Ballandras ◽  
V. Laude ◽  
B. Djafari-Rouhani
Keyword(s):  
Band Gap ◽  
Elastic Waves ◽  
Two Dimensional ◽  
Phononic Band Gap ◽  
Out Of Plane ◽  
Propagation Of Elastic Waves

Wave Manipulation of Two-Dimensional Periodic Lattice by Parametric Excitation

2019 ◽  
Vol 87 (1) ◽  
Author(s):  
Xiao-Dong Yang ◽  
Qing-Dian Cui ◽  
Wei Zhang
Keyword(s):  
Parametric Excitation ◽  
Elastic Waves ◽  
High Frequency ◽  
Low Frequency ◽  
Waveguide Structure ◽  
Phononic Crystals ◽  
Periodic Lattice ◽  
Two Dimensional ◽  
Time Dynamic ◽  
Mechanical Waves

Abstract Phononic crystals composed of delicately designed periodic units are used to control spatial and spectral properties of acoustic or elastic waves. The ability to manipulate transmitting waves in a real-time dynamic manner provides a new concept in programable phononic crystals and metamaterials. In this study, the mechanical waves and bandgaps in a two-dimensional spring-mass array loaded by high-frequency parametric excitation have been investigated by both analytical and numerical methods. It is found that the high-frequency parametric excitation provides an equivalent additional stiffness which leads to low-frequency bandgaps. By tuning the parametric excitation, the versatility of such a dynamic modulating technique has been presented. The waveguide structure has also been designed and studied by non-uniformly distributed parametric excitations.

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