Watching surface waves in phononic crystals

Wright, Oliver B.; Matsuda, Osamu

doi:10.1098/rsta.2014.0364

Cited by 16 publications

(14 citation statements)

References 48 publications

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“…Although time-domain imaging of acoustic waves in metamaterials has been carried out in a variety of studies [15][16][17][18][19], to date the frequency range has been restricted to below 1 MHz. Building on progress in imaging surface acoustic waves (SAWs) in phononic crystals [20][21][22][23][24], in this paper we present results for time-domain imaging of gigahertz-frequency SAWs on a regular array of silica microspheres adhered to a substrate-an acoustic metamaterial exhibiting contact resonances [25][26][27][28]-using ultrashort optical point-source excitation inside and outside the metamaterial region. By means of Fourier transforms we derive the acoustic dispersion relation and probe the transmission properties at different frequencies, and interpret the results with an analytical model of the microsphere resonant interactions between themselves and with the substrate.…”

Section: Introductionmentioning

confidence: 99%

Time-domain imaging of gigahertz surface waves on an acoustic metamaterial

et al. 2018

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We extend time-domain imaging in acoustic metamaterials to gigahertz frequencies. Using a sample consisting of a regular array of ∼1 μm diameter silica microspheres forming a two-dimensional triangular lattice on a substrate, we implement an ultrafast technique to probe surface acoustic wave propagation inside the metamaterial area and incident on the metamaterial from a region containing no microspheres, which reveals the acoustic metamaterial dispersion, the presence of band gaps and the acoustic transmission properties of the interface. A theoretical model of this locally resonant metamaterial based on normal and shear-rotational resonances of the spheres fits the data well. Using this model, we show analytically how the sphere elastic coupling parameters influence the gap widths.

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Section: Introductionmentioning

confidence: 99%

Time-domain imaging of gigahertz surface waves on an acoustic metamaterial

et al. 2018

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“…For both types of structure we choose microscopic sizes in order to give acoustic resonances in the gigahertz range, as such frequencies correspond to those used in surface acoustic wave filters and devices. Furthermore, direct surface acoustic wave imaging techniques exist for this frequency range 21 22 23 24 , and so our work is therefore experimentally realizable.…”

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Extraordinary transmission of gigahertz surface acoustic waves

Mézil

Chonan

Otsuka

et al. 2016

Sci Rep

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Extraordinary transmission of waves, i.e. a transmission superior to the amount predicted by geometrical considerations of the aperture alone, has to date only been studied in the bulk. Here we present a new class of extraordinary transmission for waves confined in two dimensions to a flat surface. By means of acoustic numerical simulations in the gigahertz range, corresponding to acoustic wavelengths λ ~ 3–50 μm, we track the transmission of plane surface acoustic wave fronts between two silicon blocks joined by a deeply subwavelength bridge of variable length with or without an attached cavity. Several resonant modes of the structure, both one- and two-dimensional in nature, lead to extraordinary acoustic transmission, in this case with transmission efficiencies, i.e. intensity enhancements, up to ~23 and ~8 in the two respective cases. We show how the cavity shape and bridge size influence the extraordinary transmission efficiency. Applications include new metamaterials and subwavelength imaging.

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“…The first scheme, namely, the periodic repetition of a surface motif, introduces features typical of PnCs such as nonlinear band structure, zone folding, and Bragg bandgap opening . These effects were reported for Rayleigh‐like SAWs in PnCs made out of square lattices of holes or inclusions in Si and measured by means of time‐resolved imaging and BLS . Furthermore, holey piezoelectric SAW PnCs forming an acoustic cavity for electro‐acoustically generated elastic waves were utilized to realize a one‐port Love SAW resonator operating in the gigahertz .…”

Section: Surface and Membrane Hypersonic 2d Pncsmentioning

confidence: 99%

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

Sledzinska

Graczykowski

Maire

et al. 2019

Adv Funct Materials

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The central concept in phononics is the tuning of the phonon dispersion relation, or phonon engineering, which provides a means of controlling related properties such as group velocity or phonon interactions and, therefore, phonon propagation, in a wide range of frequencies depending on the geometries and sizes of the materials. Phononics exploits the present state of the art in nanofabrication to tailor dispersion relations in the range of GHz for the control of elastic waves/phonons propagation with applications toward new information technology concepts with phonons as state variable. Moreover, phonons provide an adaptable approach for supporting a coherent coupling between different state variables, and the development of nanoscale optomechanical systems during the last decade attests this prospect. The most extended approach to manipulate the phonon dispersion relation is introducing an artificial periodic modulation of the elastic properties, which is referred to as phononic crystal (PnC). Herein, the focus is on the recent experimental achievements in the fabrication and application of 2D PnCs enabling the modification of the dispersion relation of surface and membrane modes, and presenting phononic bandgaps, waveguiding, and confinement in the hypersonic regime. Furthermore, these artificial materials offer the potential of modifying and controlling the heat flow to enable new schemes in thermal management.

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Watching surface waves in phononic crystals

Cited by 16 publications

References 48 publications

Time-domain imaging of gigahertz surface waves on an acoustic metamaterial

Time-domain imaging of gigahertz surface waves on an acoustic metamaterial

Extraordinary transmission of gigahertz surface acoustic waves

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

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