Absorption heat of GHz sound in polycrystalline metal films detected by multiple-beam interferometry and second-sound emission

Klein, Holger; Weis, O.

doi:10.1007/bf00753828

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2013

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“…The quadratic frequency absorption coefficient b may contain contributions from viscoelasticity [51,52], whereas the frequency-independent absorption coefficient a can arise from deviations of the acoustic reflection coefficient at the W/crown-glass interface from the assumed literature value. The values of a and b can be obtained by comparison of the Fourier amplitude of the first, second, and third echoes [53].…”

Section: Discussionmentioning

confidence: 99%

Ultrafast ellipsometric interferometry for direct detection of coherent phonon strain pulse profiles

et al. 2013

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We describe an ultrafast optical technique to quantitatively detect picosecond ultrasonic displacements of solid surfaces, thus giving access to the longitudinal strain pulse shape. Transient optical reflectance changes recorded at oblique optical incidence with a common-path interferometric configuration based on ultrafast ellipsometry monitor gigahertz coherent phonon pulses. We demonstrate for a tungsten film the quantitative extraction of the strain pulse shape free of distortions arising from the photoelastic effect, and analyze the results with the two-temperature model to obtain the value g ≈ 3 × 10 17 Wm −3 K −1 for the electron-phonon coupling constant. Analysis of the data also reveals a thermo-optic contribution.

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Section: Discussionmentioning

confidence: 99%