Scanning phononic lattices with ultrasound

Vines, R. E.; Wolfe, J. P.; Every, A.V.

doi:10.1103/physrevb.60.11871

Cited by 49 publications

(47 citation statements)

References 12 publications

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“…The distribution of the frequency band of surface acoustic waves is usually well separated from those of bulk waves, and their stop-band distribution has been observed by both surface wave transmission and imaging experiments. 11,12 An attenuation associated with the Rayleigh surface wave propagation has been measured in a 2D triangular and honeycomb ͑hexagonal͒ lattice with vacuum cylinders drilled in a marble quarry 11 and also with polymer cylinders drilled in an aluminum substrate. 12 The attenuation in transmission spectra in the former lattice suggests the existence of absolute band gaps for the surface waves.…”

Section: Discussionmentioning

confidence: 99%

“…11,12 An attenuation associated with the Rayleigh surface wave propagation has been measured in a 2D triangular and honeycomb ͑hexagonal͒ lattice with vacuum cylinders drilled in a marble quarry 11 and also with polymer cylinders drilled in an aluminum substrate. 12 The attenuation in transmission spectra in the former lattice suggests the existence of absolute band gaps for the surface waves. However, the measurements are sometimes compared with a theoretical calculation with a simple scalar-wave model.…”

Section: Discussionmentioning

confidence: 99%

“…Intuitively, these holes should scatter acoustic waves strongly, and the transmission of ultrasound through the structure is expected to be small or even prohibited for a large cross section of the cylinders. Another interesting and still easily accessible structure is that of cylinders filled with a liquid 7 or a low-melting-point polymer 12 ͑which may solidify at room temperatures͒. These composites are characterized by a large acoustic mismatch between the cylinder and substrate materials, or by the fact that two modes of acoustic waves ͑transverse modes͒ are not allowed to exist in the cylinders.…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9][10][11][12] The dimension of the phononic crystals used in the experiments is typically in the range of millimeters and a composite structure is made by drilling in a solid substrate a periodic array of cylinders. The simplest structure should be the one with vacuum or air-filled cylindrical holes.…”

Section: Introductionmentioning

confidence: 99%

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Band structure of acoustic waves in phononic lattices: Two-dimensional composites with large acoustic mismatch

2000

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The finite-difference time-domain method is applied to the calculation of dispersion relations of acoustic waves in two-dimensional ͑2D͒ phononic lattices, i.e., periodic solid-solid, solid-liquid, and solid-vacuum composites, for which the conventional plane-wave-expansion method fails or converges very slowly. Numerical examples are developed for 2D structures with polyethylene, mercury, and vacuum cylinders forming a square lattice in an aluminum matrix. The implication of the calculated dispersion relations for ultrasound transmission experiments is discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Band structure of acoustic waves in phononic lattices: Two-dimensional composites with large acoustic mismatch

2000

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“…Investigations into surface wave properties of solids in which the periodic modulation occurs on the traction-free surface did not take place until quite recently [31][32][33][34][35][36][37]. The calculations for surface waves on a square and hexagonal superlattice consisting of cubic (AlAs/GaAs) and isotropic (Al/polymer) materials were reported [31,32].…”

Section: Introductionmentioning

confidence: 99%

Surface acoustic wave band gaps in micro-machined air/silicon phononic structures — theoretical calculation and experiment

Wu¹,

Huang²,

Liu³

2005

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. In this paper, we investigate the band gaps of micro-machined air/silicon phononic structures both theoretically and experimentally. Based on the plane wave expansion method, dispersion relations of the surface and bulk modes with square lattices in air/silicon two-dimensional phononic structures are calculated and discussed. Band gap widths due to the filling fraction and temperature variation are also analyzed. On the experimental side, generation and reception of high frequency surface acoustic wave in this band structure are realized by a pair of interdigital transducers (IDT) with frequency around 200 MHz. Details of the fabricating process of the phononic structure and the high frequency surface wave generating and receiving IDTs are given. The results demonstrate clearly the existence of SAW band gap in the micro-machined phononic structure and this study may serve as a basis for studying the band gap of SAW in micro-machined phononic structure with the dimension in the order of micrometer and find applications in the RF SAW devices.

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Surface Acoustic Waves in Phononic Crystals

Hsu

Sun

et al. 2016

Phononic Crystals

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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

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Scanning phononic lattices with ultrasound

Cited by 49 publications

References 12 publications

Band structure of acoustic waves in phononic lattices: Two-dimensional composites with large acoustic mismatch

Band structure of acoustic waves in phononic lattices: Two-dimensional composites with large acoustic mismatch

Surface acoustic wave band gaps in micro-machined air/silicon phononic structures — theoretical calculation and experiment

Surface Acoustic Waves in Phononic Crystals

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