The propagation and localization of Rayleigh waves in disordered piezoelectric phononic crystals

Wang, Yi–Ze; Li, Fengming; Huang, Wenhu; Wang, Yue-Sheng

doi:10.1016/j.jmps.2007.07.014

Cited by 79 publications

(23 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[2][3][4] Later on, these periodic structures fabricated on silicon or piezoelectric substrates demonstrated their very good compatibility with the MEMS as well as their potential for applications in the wireless telecommunications and sensors. 5,6 Waves guided either on the surface of a semi-infinite medium or in between the free surfaces of a plate have been studied, both theoretically [3][4][5][6][7][8] and experimentally. [9][10][11] At the same time, the shape, sizes, and arrangement of the periodic inclusions, e.g.…”

mentioning

confidence: 99%

Focusing of Rayleigh waves with gradient-index phononic crystals

Zhao

Bonello

Becerra

et al. 2016

Applied Physics Letters

View full text Add to dashboard Cite

We report on the subwavelength focusing of Rayleigh waves using gradient-index (GRIN) phononic crystals (PCs) made of air holes scatters in a thick silicon substrate. The subwavelength focusing is demonstrated both in the inner and in the silicon substrate behind the GRIN PCs by using a non-contact experimental technique. In both situations, the focal zone was observed at the position, which is in very good agreement with our theoretical predictions, at a frequency in the sound cone free of radiation into the substrate.

show abstract

mentioning

confidence: 99%

Focusing of Rayleigh waves with gradient-index phononic crystals

Zhao

Bonello

Becerra

et al. 2016

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…The authors showed that the BG surface waves have higher acoustic wave velocities, high electromechanical coupling coefficients, and larger band gap width than those of the Rayleigh surface waves and pseudosurface waves. In a recent article [35], the concept of the localization factor was introduced to study the Rayleigh surface wave propagation and localization in disordered piezoelectric PCs and the authors found that the larger the randomness degree, the stronger the degree of wave localization.…”

mentioning

confidence: 99%

Surface Acoustic Waves in Phononic Crystals

Hsu

Sun

et al. 2016

Phononic Crystals

View full text Add to dashboard Cite

Over the past two decades, propagation of acoustic waves in periodic structures comprised of multi-components has received much attention because of renewed physical properties and potential applications in a variety of fields, such as noise and vibration isolation, frequency filters in wireless communication, super lens design, etc. These composite materials, called phononic crystals (PCs) [1,2], give rise to forbidden gaps for acoustic waves which are analogous to the band gaps for electromagnetic waves in photonic crystals. Major mechanisms leading to the forbidden gaps are Bragg scattering and localized resonances (LR) [3]. The former opens up the Bragg gap at the Brillouin-zone boundaries, and the band-gap frequency corresponds to the wavelength in the order of the structural period, i.e. of the lattice constant, and relates to the lattice symmetry. On the other hand, localized

show abstract

“…Phononic band gap materials [2] have a direct impact on a vast number of applications, including audible filters [3], acoustic diodes [4], ultrasound imaging [5], optomechanics [6], heat conduction, and energy harvesting [7][8][9][10], etc. On the other hand, disorder in elastic media [11][12][13][14] is important for a large range of applications including acoustic filters [15], piezoelectric materials [16], biological materials [17], fracture [18], and manipulation of the thermal conductance [7,19], etc. Despite this and in contrast to the vast body of studies dealing with the effects of disorder on photonic structures, the research of disordered phononic systems and the effect of disorder on phononic band gaps has been sparse, with a few notable exceptions [12,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Freeform Phononic Waveguides

Gkantzounis

Florescu

2017

Crystals

View full text Add to dashboard Cite

Abstract:We employ a recently introduced class of artificial structurally-disordered phononic structures that exhibit large and robust elastic frequency band gaps for efficient phonon guiding. Phononic crystals are periodic structures that prohibit the propagation of elastic waves through destructive interference and exhibit large band gaps and ballistic propagation of elastic waves in the permitted frequency ranges. In contrast, random-structured materials do not exhibit band gaps and favour localization or diffusive propagation. Here, we use structures with correlated disorder constructed from the so-called stealthy hyperuniform disordered point patterns, which can smoothly vary from completely random to periodic (full order) by adjusting a single parameter. Such amorphous-like structures exhibit large band gaps (comparable to the periodic ones), both ballistic-like and diffusive propagation of elastic waves, and a large number of localized modes near the band edges. The presence of large elastic band gaps allows the creation of waveguides in hyperuniform materials, and we analyse various waveguide architectures displaying nearly 100% transmission in the GHz regime. Such phononic-circuit architectures are expected to have a direct impact on integrated micro-electro-mechanical filters and modulators for wireless communications and acousto-optical sensing applications.

show abstract

The propagation and localization of Rayleigh waves in disordered piezoelectric phononic crystals

Cited by 79 publications

References 24 publications

Focusing of Rayleigh waves with gradient-index phononic crystals

Focusing of Rayleigh waves with gradient-index phononic crystals

Surface Acoustic Waves in Phononic Crystals

Freeform Phononic Waveguides

Contact Info

Product

Resources

About