Surface and bulk acoustic waves in two-dimensional phononic crystal consisting of materials with general anisotropy

Wu, Tsung‐Tsong; Huang, Zi-Gui; Lin, Szu-Yuan

doi:10.1103/physrevb.69.094301

Cited by 297 publications

(147 citation statements)

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“…Recently, elastic stop bands for surface acoustic waves ͑SAWs͒ have been at the center of a growing research effort. [3][4][5][6][7] Experimental demonstrations of directional 8 as well as full band gaps 9 in piezoelectric crystals at the micrometer scale have been reported. These studies have taken advantage of the possibility to directly generate and receive SAWs by using interdigital transducers ͑IDTs͒, 10 thus allowing testing of PCs in realistic device configurations via electrical measurements.…”

Section: Scattering Of Surface Acoustic Waves By a Phononic Crystal Rmentioning

confidence: 99%

Scattering of surface acoustic waves by a phononic crystal revealed by heterodyne interferometry

Kokkonen

Kaivola

Benchabane

et al. 2007

Applied Physics Letters

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International audienceSurface acoustic wave propagation within a two-dimensional phononic band gap structure has been studied using a heterodyne laser interferometer. Acoustic waves are launched by interdigital transducers towards a square lattice of holes etched in a piezoelectric medium. Interferometer measurements performed at frequencies lying below, within, and above the expected band gap frequency range provide direct information of the wave interaction with the phononic crystal, revealing anisotropic scattering into higher diffraction orders depending on the apparent grating pitch at the boundary between the phononic crystal and free surface. Furthermore, the measurements also confirm the existence of an elastic band gap, in accordance with previous electrical measurements and theoretical predictions

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Section: Scattering Of Surface Acoustic Waves By a Phononic Crystal Rmentioning

confidence: 99%

Scattering of surface acoustic waves by a phononic crystal revealed by heterodyne interferometry

Kokkonen

Kaivola

Benchabane

et al. 2007

Applied Physics Letters

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“…It is worth noting that in conducting the acoustic waves in the solid/fluid structure, a modified PWE method was used [4]- [7]. In addition to the band gap analyses of bulk modes in 2D phononic structures, there is some literature on the investigation of band gaps of surface acoustic waves (SAW) [9]- [11]. More detailed studies of temperature effects of surface wave band gaps and electromechanical coupling coefficient in a piezoelectric phononic crystal are also reported [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional phononic band gap calculations using the FDTD method and a PC cluster system

Hsieh

Sun

2006

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Abstract-This paper aims at studying the band gap phenomena of three-dimensional phononic crystals using the finite difference time domain (FDTD) method and a PC cluster system. In the paper, Bloch's theorem is applied to the wave equation and to the boundary conditions of the periodic structure. We calculate the variations of displacements and take discrete Fourier transform to acquire the resonances of the structures. Then, the dispersion relations of the bulk acoustic wave can be obtained and the band gaps are predicted accordingly. On the other hand, because of larger data calculation in three-dimensional phononic crystals, we introduce the PC cluster system and parallel FDTD programs written with respect to the architecture of a PC cluster system. Finally, we discuss the numerical calculation of two-dimensional and three-dimensional phononic crystals consisting of steel/epoxy and draw conclusions regarding the band gap phenomena between these phononic crystals.

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“…Recently, PnCs and elastic stop bands for SAWs have been at the center of a growing research effort [112][113][114][115][116], both because of interesting wave physics involved and due to potential for significant impact on technological applications. Since the SAWs are by nature confined to the vicinity of the surface, a lithographically defined, two-dimensional PnC is, in principle, able to provide full-confinement of the waves.…”

Section: Phononic Crystal For Surface Acoustic Wavesmentioning

confidence: 99%

Measurement of evanescent wave properties of a bulk acoustic wave resonator [Letters]

Kokkonen

Meltaus

Pensala

et al. 2012

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Aalto University publication series DOCTORAL DISSERTATIONS 112/2014 © Kimmo Kokkonen AbstractThe research summarized in this dissertation focuses on the development of a heterodyne scanning laser interferometer and of data-analysis techniques for the characterization and analysis of the surface vibration fields in microacoustic devices and test structures.The heterodyne laser interferometer enables a phase-sensitive, absolute-amplitude detection of the out-of-plane component of a surface vibration field, with a minimum detectable amplitude of less than a picometer, while the lateral resolution is better than 1 micrometer. The instrument features a flat frequency response up to 6 GHz.The phase-sensitive absolute-amplitude data enables the visualization of the actual wave behavior in electromechanical components and test structures, but more importantly, it is the basis for further analysis. The research instrument is applied to the study of electroacoustic devices based on surface acoustic wave (SAW) and bulk acoustic wave (BAW) technologies. Two novel SAW devices are studied in detail: a phononic crystal (PnC) structure and a scattering structure resulting in a random wave field. PnCs are acoustic metamaterials that can provide engineered material properties. The laser interferometric measurements were amongst the first to directly characterize the wave interaction with the PnC. SAW slowness curves of an anisotropic substrate material are extracted by measuring and analyzing the scattered random wave field. Data analysis methods are developed further in the context of BAW research by experimentally addressing two important aspects of device design: the correct operation of the acoustic reflector used to confine the energy in the resonator, and investigation of the role of the dispersion and standing wave resonances to the spurious responses often observed in high-Q resonators. Fourier transform techniques are used for selective visualization of wave fields and for the extraction of the dispersion characteristics of the plate-waves. The dispersion data are then further used to analyze the transfer characteristics of an acoustic reflector and to study the properties of lateral eigenresonances and the lateral energy confinement in detail.The research described in this thesis provides a detailed characterization of the operation of SAW and BAW devices and effects within, highlighting and further developing the experimental characterization capabilities and data-analysis methods.Keywords laser interferometry, microacoustics, surface acoustic waves, bulk acoustic waves Tiivistelmä Väitöskirjatyö käsittelee heterodyne-tyyppisen laserinterferometrin sekä interferometrin tuottaman datan analyysitekniikoiden kehittämistä pintavärähtelykenttien karakterisoimiseksi ja analysoimiseksi mikroakustisissa komponenteissa ja testirakenteissa.Työssä rakennettu heterodynelaserinterferometri mahdollistaa pintavärähtelyiden vaiheherkät absoluuttiamplitudimittaukset aina 6 GHz taajuuteen asti. Laitteisto kykenee värähtely-kenttien k...

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Surface and bulk acoustic waves in two-dimensional phononic crystal consisting of materials with general anisotropy

Cited by 297 publications

References 13 publications

Scattering of surface acoustic waves by a phononic crystal revealed by heterodyne interferometry

Scattering of surface acoustic waves by a phononic crystal revealed by heterodyne interferometry

Three-dimensional phononic band gap calculations using the FDTD method and a PC cluster system

Measurement of evanescent wave properties of a bulk acoustic wave resonator [Letters]

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