Laser-Ultrasonic Characterization of Strongly Anisotropic Materials by Transient Grating Spectroscopy

Stoklasová, Pavla; Grabec, Tomáš; Zoubková, Kristýna; Sedlák, Petr; Krátký, Stanislav; Seiner, Hanuš

doi:10.1007/s11340-021-00698-6

Cited by 20 publications

(6 citation statements)

References 44 publications

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“…Theoretically, only the transverse mode that is mode-converted from the longitudinal mode, either incident at the surface or propagating along the surface, could contribute to shear surface displacement. Based on accumulated experimental , and theoretical , knowledge, it is anticipated that the structures in which either the substrate, the grating, or both exhibit elastic anisotropy, are better suited for controlling T waves. In the absence of elastic anisotropy, gR and L waves are expected to significantly dominate the acoustic signals in transient reflectivity measurements.…”

Section: Resultsmentioning

confidence: 99%

“…35,36 The detection of L waves was previously reported in multiple experiments utilizing visible 11,36 and UV laser-induced gratings, 19 as well as deposited metallic gratings. 37,38 Concomitantly, these gratings modulate (structure) the near-surface properties of the sample and modulate (ripple) the surface profile. However, there are relatively few reports 38 on T waves detection through laserinduced gratings in opaque materials.…”

Section: Resultsmentioning

confidence: 99%

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Optically Controlled Nano-Transducers Based on Cleaved Superlattices for Monitoring Gigahertz Surface Acoustic Vibrations

Li,

Chigarev,

Thréard

et al. 2024

ACS Nano

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Surface acoustic waves (SAWs) convey energy at subwavelength depths along surfaces. Using interdigital transducers (IDTs) and opto-acousto-optic transducers (OAOTs), researchers have harnessed coherent SAWs with nanosecond periods and micrometer localization depth for various applications. These applications include the sensing of small amount of materials deposited on surfaces, assessing surface roughness and defects, signal processing, light manipulation, charge carrier and exciton transportation, and the study of fundamental interactions with thermal phonons, photons, magnons, and more. However, the utilization of cutting-edge OAOTs produced through surface nanopatterning techniques has set the upper limit for coherent SAW frequencies below 100 GHz, constrained by factors such as the quality and pitch of the surface nanopattern, not to mention the electronic bandwidth limitations of the IDTs. In this context, unconventional optically controlled nanotransducers based on cleaved superlattices (SLs) are here presented as an alternative solution. To demonstrate their viability, we conducted proof-of-concept experiments using ultrafast lasers in a pump−probe configuration on SLs made of alternating Al x Ga 1−x As and Al y Ga 1−y As layers with approximately 70 nm periodicity and cleaved along their growth direction to produce a periodic nanostructured surface. The acoustic vibrations, generated and detected by laser beams incident on the cleaved surface, span a range from 40 to 70 GHz, corresponding to the generalized surface Rayleigh mode and bulk modes within the dispersion relation. This exploration shows that, in addition to SAWs, cleaved SLs offer the potential to observe surface-skimming longitudinal and transverse acoustic waves at GHz frequencies. This proof-of-concept demonstration below 100 GHz in nanoacoustics using such an unconventional platform might be useful for realizing sub-THz to THz coherent surface acoustic vibrations in the future, as SLs can be epitaxially grown with atomic-scale layer width and quality.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Optically Controlled Nano-Transducers Based on Cleaved Superlattices for Monitoring Gigahertz Surface Acoustic Vibrations

Li,

Chigarev,

Thréard

et al. 2024

ACS Nano

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“…The elastic constants of the Cu 69 Al 17 Mn 14 alloy were precisely evaluated at room temperature using the laser–ultrasonic transient grating spectroscopy method 53 . The measurements were performed on an approximately (110)-oriented single crystal.…”

Section: Methodsmentioning

confidence: 99%

Non-Hookean large elastic deformation in bulk crystalline metals

Odaira

Sato

et al. 2022

Nat Commun

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Crystalline metals can have large theoretical elastic strain limits. However, a macroscopic block of conventional crystalline metals practically suffers a very limited elastic deformation of <0.5% with a linear stress–strain relationship obeying Hooke’s law. Here, we report on the experimental observation of a large tensile elastic deformation with an elastic strain of >4.3% in a Cu-based single crystalline alloy at its bulk scale at room temperature. The large macroscopic elastic strain that originates from the reversible lattice strain of a single phase is demonstrated by in situ microstructure and neutron diffraction observations. Furthermore, the elastic reversible deformation, which is nonhysteretic and quasilinear, is associated with a pronounced elastic softening phenomenon. The increase in the stress gives rise to a reduced Young’s modulus, unlike the traditional Hooke’s law behaviour. The experimental discovery of a non-Hookean large elastic deformation offers the potential for the development of bulk crystalline metals as high-performance mechanical springs or for new applications via “elastic strain engineering.”

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“…The first point to note is that the effect of C 11 is the inverse of C 12 , this is suggestive of interdependence between these constants. Further- and C 44 can be accurately determined by SAW velocity measurement [37] .…”

Section: Influence Of Elasticity On Ultrasonic Velocitymentioning

confidence: 99%

Measurement of the single crystal elasticity matrix of polycrystalline materials

Dryburgh

Pieris

et al. 2022

Acta Materialia

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Laser-Ultrasonic Characterization of Strongly Anisotropic Materials by Transient Grating Spectroscopy

Cited by 20 publications

References 44 publications

Optically Controlled Nano-Transducers Based on Cleaved Superlattices for Monitoring Gigahertz Surface Acoustic Vibrations

Optically Controlled Nano-Transducers Based on Cleaved Superlattices for Monitoring Gigahertz Surface Acoustic Vibrations

Non-Hookean large elastic deformation in bulk crystalline metals

Measurement of the single crystal elasticity matrix of polycrystalline materials

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