Dispersion of surface elastic waves on Z-LiNbO3 films on Z-sapphire

Spina, Léa La; Micard, Quentin; Mosset, A.; Margueron, Samuel; Bartasyte, Ausrine; Laude, Vincent

doi:10.1063/5.0142417

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…The backscattering arrangement provides a comparably large interaction volume, allowing for a high temporal resolution and Brillouin spectra that are recorded faster compared to other common scattering geometries 29 . The direction and magnitude of the acoustic wavevector q are determined by the scattering geometry, which is extremely important in the case of material with preferential directions as in crystals and fibers 22,[30][31][32][33] .…”

Section: Introductionmentioning

confidence: 99%

Estimation of the elastic and piezoelectric tensors of sapphire and lithium niobate from Brillouin light backscattering measurements of a single crystal sample

Ugarak,

Iglesias Martínez,

Mosset

et al. 2023

Journal of Applied Physics

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Brillouin light scattering is a versatile measurement technique of the dispersion of bulk acoustic phonons in amorphous and crystalline solids. It allows contactless and non-destructive characterization of the relevant material tensors of optically transparent materials, provided that the optical refraction indices, and in addition the dielectric tensor for piezoelectric materials, are known beforehand. The complete estimation of the anisotropic material tensors is often performed using many different crystal orientations, and hence different samples of the same crystal. In this paper, we consider the problem of measuring those tensors using a single sample of an anisotropic single crystal with trigonal symmetry. A complete measurement requires sufficient experimental diversity in the phonon wavevectors when sampling the phonon velocity surfaces, hence the consideration of a large number of directions away from crystallographic axes. We estimate all six independent elastic constants of non-piezoelectric sapphire (3¯ m point group) with a single X-cut wafer and the six independent elastic constants together with the four independent piezoelectric constants of piezoelectric lithium niobate (3 m point group) with a single Y-cut wafer. The estimated tensors are in close agreement with those reported in the literature based on resonant ultrasonic techniques.

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Section: Introductionmentioning

confidence: 99%

Estimation of the elastic and piezoelectric tensors of sapphire and lithium niobate from Brillouin light backscattering measurements of a single crystal sample

Ugarak,

Iglesias Martínez,

Mosset

et al. 2023

Journal of Applied Physics

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Velocity of subsonic and hypersonic surface acoustic waves on silicon with native oxide layer

Ugarak,

Mosset,

Laude

2024

Applied Physics Letters

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The anisotropic dependence of the velocity of surface acoustic waves (SAW) on silicon is explored using surface Brillouin light scattering. Measurements of the SAW velocity are compared to a numerical model that takes into account the native thin amorphous oxide layer formed at the top surface of the silicon wafer. The model accounts for material loss and provides a relative estimate for the backscattered intensity resulting from the ripple effect. For the (100) sample considered, a thickness of 4 nm fits well with experimental data, considering material constants of amorphous silica for the oxide. A global phase velocity decrease of −11 m/s per nanometer of silica thickness is predicted for surface phonons at frequencies around 16 GHz.

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Symmetry of the coupling between surface acoustic waves and spin waves in synthetic antiferromagnets

Lopes Seeger,

La Spina,

Laude

et al. 2024

Phys. Rev. B

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Dispersion of surface elastic waves on Z-LiNbO3 films on Z-sapphire

Cited by 3 publications

References 28 publications

Estimation of the elastic and piezoelectric tensors of sapphire and lithium niobate from Brillouin light backscattering measurements of a single crystal sample

Estimation of the elastic and piezoelectric tensors of sapphire and lithium niobate from Brillouin light backscattering measurements of a single crystal sample

Velocity of subsonic and hypersonic surface acoustic waves on silicon with native oxide layer

Symmetry of the coupling between surface acoustic waves and spin waves in synthetic antiferromagnets

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