Interaction of Sound Waves with Thermal Phonons in Dielectric Crystals

Maris, Humphrey J.

doi:10.1016/b978-0-12-395668-2.50011-9

Cited by 84 publications

(83 citation statements)

References 129 publications

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“…It should be noticed that below a few kilohertz, internal friction (of a longitudinal or transverse wave) in an homogeneous medium is dominated by thermoelastic dissipation [26]. This is no longer the case when frequencies are greater than 5 MHz at low temperatures, like in the experiments discussed in this paper: phonon-phonon dissipation dominates inside the substrate [6,18,19,[27][28][29].…”

Section: Discussionmentioning

confidence: 66%

“…These electrodes were separated from the resonator surface by 5 shows the typical behavior of mechanical losses as a function of temperature for the A and B modes in the case of a bare and Ta 2 O 5 /SiO 2 coated quartz substrate. A 1/T n , where 4 < n < 7, dependence for 6 K < T < 12 K is the signature of three-phonon processes in the Landau-Ruomer regime [18,19]. This power low demonstrates that the intrinsic dissipation in the bare quartz substrate are dominant and no suspension related losses are important.…”

Section: Results With Dielectric Coatingsmentioning

confidence: 85%

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A new method of probing mechanical losses of coatings at cryogenic temperatures

Galliou

Deléglise

Goryachev

et al. 2016

Review of Scientific Instruments

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A new method of probing mechanical losses and comparing the corresponding deposition processes of metallic and dielectric coatings in 1-100 MHz frequency range and cryogenic temperatures is presented. The method is based on the use of extremely high-quality quartz acoustic cavities whose internal losses are orders of magnitude lower than any available coatings nowadays. The approach is demonstrated for Chromium, Chromium/Gold and a multilayer tantala/silica coatings. The Ta2O5/SiO2 coating has been found to exhibit a loss angle lower than 1.6 × 10 −5 near 30 MHz at 4 K. The results are compared to the previous measurements.

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Section: Discussionmentioning

confidence: 66%

Section: Results With Dielectric Coatingsmentioning

confidence: 85%

A new method of probing mechanical losses of coatings at cryogenic temperatures

Galliou

Deléglise

Goryachev

et al. 2016

Review of Scientific Instruments

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show abstract

“…5). According to the theory18, the acoustic wave attenuation α is proportional to the resonance angular frequency ω as long as , and where τ denotes the average lifetime of thermal phonons, ℏ the Planck constant, and k B the Boltzmann constant. As a consequence, the Q phonon–phonon -factor of an acoustic wave propagating with velocity V would no longer depend on frequency ω .…”

Section: Discussionmentioning

confidence: 99%

Extremely Low Loss Phonon-Trapping Cryogenic Acoustic Cavities for Future Physical Experiments

Galliou

Goryachev

Bourquin

et al. 2013

Sci Rep

109

138

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Low loss Bulk Acoustic Wave devices are considered from the point of view of the solid state approach as phonon-confining cavities. We demonstrate effective design of such acoustic cavities with phonon-trapping techniques exhibiting extremely high quality factors for trapped longitudinally-polarized phonons of various wavelengths. Quality factors of observed modes exceed 1 billion, with a maximum Q-factor of 8 billion and Q × f product of 1.6 · 1018 at liquid helium temperatures. Such high sensitivities allow analysis of intrinsic material losses in resonant phonon systems. Various mechanisms of phonon losses are discussed and estimated.

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“…Indeed, attenuation in crystals, especially at low temperature is not a trivial thing, as well explained in Ref. [49].…”

Section: Dispersionmentioning

confidence: 96%

Nonlinear ultrafast acoustics at the nano scale

2015

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Pulsed femtosecond lasers can generate acoustic pulses propagating in solids while displaying either diffraction, attenuation, nonlinearity and/or dispersion. When acoustic attenuation and diffraction are negligible, shock waves or solitons can form during propagation. Both wave types are phonon wavepackets with characteristic length scales as short as a few nanometer. Hence, they are well suited for acoustic characterization and manipulation of materials on both ultrafast and ultrashort scales. This work presents an overview of nonlinear ultrasonics since its first experimental demonstration at the beginning of this century to the more recent developments. We start by reviewing the main properties of nonlinear ultrafast acoustic propagation based on the underlying equations. Then we show various results obtained by different groups around the world with an emphasis on recent work. Current issues and directions of future research are discussed.

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Interaction of Sound Waves with Thermal Phonons in Dielectric Crystals

Cited by 84 publications

References 129 publications

A new method of probing mechanical losses of coatings at cryogenic temperatures

A new method of probing mechanical losses of coatings at cryogenic temperatures

Extremely Low Loss Phonon-Trapping Cryogenic Acoustic Cavities for Future Physical Experiments

Nonlinear ultrafast acoustics at the nano scale

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