Real-time imaging and dispersion of surface phonons in isotropic and anisotropic materials

Wright, Oliver B.; Sugawara, Yoshihiro; Matsuda, Osamu; Takigahira, M.; Tanaka, Yukihiro; Tamura, Shin–ichiro; Gusev, Vitalyi

doi:10.1016/s0921-4526(02)00421-0

Cited by 10 publications

(7 citation statements)

References 12 publications

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“…corresponding to an area increased to A 1 = 2.5 A 0 , to account for the combined effects of the decrease in wave amplitude on propagation outwards ( for radii r ≳ λ ) and the increase in arc length (∝ r ); for a monochromatic circularly propagating wave in two dimensions, the radial form of the waveform contains a spatial modulation in the form J 0 ( kr ) (see, e.g., ref. 29 ), where k is the wavenumber, which for kr > 1/4 (i.e. r > λ /25) can be approximated as .…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

Extraordinary transmission of gigahertz surface acoustic waves

Mézil

Chonan

Otsuka

et al. 2016

Sci Rep

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“…This is consistent with the experimental situation. 2,3 More explicitly the initial displacement profile is…”

Section: Fdtd Methodsmentioning

confidence: 99%

“…2,3 They used the optical pump and probe technique 4 to periodically excite surface phonons, illuminating an opaque thin film on a transparent substrate. With this technique they have imaged the wave fronts of acoustic waves on surfaces at frequencies up to 1 GHz.…”

Section: Introductionmentioning

confidence: 99%

Wave-front images of acoustic waves in the (100) and (001) surfaces ofTeO2

2002

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Based on the finite-difference time-domain ͑FDTD͒ method, we study theoretically the wave-front images of acoustic waves propagating on the ͑100͒ and ͑001͒ surface of a highly anisotropic tetragonal TeO 2 crystal for which imaging experiments have recently been conducted. The theoretical images well reproduce characteristic features observed experimentally. The group-velocity calculations of both surface and pseudosurface acoustic waves account for the shapes and locations of the major wave fronts obtained with the FDTD method. Additional weak wave-front structures that disappear rather quickly in time are attributed to bulk acoustic waves.

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“…40 Interferometry has been used to measure attenuation and velocity of acoustic waves in a variety of configurations. 10,41,42 It offers high sensitivity, a low displacement detection limit, and a potentially large bandwidth. In general, in laserinduced pump-probe SAW spectroscopy the bandwidth of the measurement is limited by the temporal duration of the pump beam, the bandwidth of the detection electronics (for cw probe) or the duration of the probe laser pulse (for a time-delayed probe pulse) and the spatial scale of the excitation and probe regions, which in the simplest case is limited by the excitation and probe spot sizes.…”

Section: B Localized Detection Of Laser Excited Acoustic Wavesmentioning

confidence: 99%

Phase mask based interferometer: Operation principle, performance, and application to thermoelastic phenomena

Glorieux

Beers

Bentefour

et al. 2004

Review of Scientific Instruments

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A simple, versatile, sensitive optical interferometer based on diffractive optics is presented. The absence of a need for active stabilization, and a compact common-path design requiring two optical elements, make the interferometer ideal for time-resolved measurements in the picosecond through millisecond regimes. Its performance is characterized quantitatively, and its utility for local detection and scanning as well as spatially resolved imaging of thermoelastically induced strain is demonstrated.

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Real-time imaging and dispersion of surface phonons in isotropic and anisotropic materials

Cited by 10 publications

References 12 publications

Extraordinary transmission of gigahertz surface acoustic waves

Extraordinary transmission of gigahertz surface acoustic waves

Wave-front images of acoustic waves in the (100) and (001) surfaces ofTeO2

Phase mask based interferometer: Operation principle, performance, and application to thermoelastic phenomena

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