Towards shaping picosecond strain pulses via magnetostrictive transducers

Mattern, Maximilian; Pudell, J.; Dumesnil, K.; Reppert, A. von; Bargheer, Matias

doi:10.1016/j.pacs.2023.100463

Cited by 8 publications

(14 citation statements)

References 61 publications

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“…Optical phonons, i.e., coherent atomic motions within the crystallographic unit cell, are accessible via the modulations of the x-ray intensity through the structure factor [136] , [137] , [138] . The excitation can be tailored by changing the wavelength and duration of the pump-pulse, by multipulse-excitation sequences [95] , [104] or by combining optical excitation with externally applied magnetic or electric fields [134] . Time-resolved studies of phase transitions that are accompanied by lattice strain [111] , [139] , [140] or non-thermal stresses that arise in laser-excited piezo- and ferroelectric materials [141] , [142] represent another intriguing field for the application of PUX.…”

Section: Discussionmentioning

confidence: 99%

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Concepts and use cases for picosecond ultrasonics with x-rays

et al. 2023

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Section: Discussionmentioning

confidence: 99%

“…For each of these mechanisms it is interesting to investigate, if the NTE is also active in non-equilibrium states after ultrashort laser pulse excitation. An ultrafast NTE or Invar behavior may lead to novel transducer applications that may allow for tunable waveforms for picosecond ultrasonics as discussed in [134] .…”

Section: Use Cases For Puxmentioning

confidence: 99%

Concepts and use cases for picosecond ultrasonics with x-rays

et al. 2023

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“…Optical phonons, i.e., coherent atomic motions within the crystallographic unit cell, are accessible via the modulations of the x-ray intensity through the structure factor [134][135][136]. The excitation can be tailored by changing the wavelength and duration of the pump-pulse, by multipulse-excitation sequences [95,104] or by combining optical excitation with externally applied magnetic or electric fields [132]. Time-resolved studies of phase transitions that are accompanied by lattice strain [137][138][139] or non-thermal stresses that arise in laser-excited piezo-and ferroelectric materials [140,141] represent another intriguing field for the application of PUX.…”

Section: Discussionmentioning

confidence: 99%

Section: Detecting Ultrafast Negative Thermal Expansionmentioning

confidence: 99%

Concepts and use cases for picosecond ultrasonics with x-rays

Mattern¹,

Reppert²,

Zeuschner³

et al. 2023

Preprint

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We discuss picosecond ultrasonics experiments that complement the established, versatile all-optical schemes by utilizing ultrashort hard x-ray probe pulses. We focus on the extraction of the transient strain response from Bragg peak shifts in the symmetric diffraction condition for layered, nanoscopic structures upon excitation of metallic transducers with femtosecond laser pulses. This type of experiment yields direct, layer-specific and quantitative information on the shape and amplitude of picosecond strain pulses and quasi-static strain even for structures thinner than the optical skin depth. We revisit the inhomogeneous elastic wave equation, which is established for modeling the picosecond strain response and express the driving stress using Grüneisen parameters. This elucidates that the laser-induced stress is proportional to the thermal energy densities in the microscopic subsystems of the solid, i.e., electrons, phonons and spins. The strain response may therefore serve as an ultrafast quantitative proxy for the local energy-density and temperature rise. We underline the importance of the Poisson effect for the quantitative interpretation of the ultrafast strain response. The homogeneous laser-excitation of continuous thin films constrains their ultrafast in-plane expansion, thus suppressing the associated out-of-plane Poisson stress. However, it is present in near equilibrium heating experiments calibrating thermal expansion coefficients which requires an individual treatment of the ultrafast expansion. The selected experimental use cases encompass opaque as well as ultrathin metal-heterostructures, nanostructures and negative thermal expansion materials, that each pose a challenge to all-optical approaches.

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“…The article [3] is the first review article to discuss PLU experiments using ultrashort hard X-ray probe pulses to monitor coherent picosecond acoustic phonons generated in laser-excited nanoscale structures from Bragg-peak shifts. This ‘picosecond ultrasonics with X-ray’ (PUX) method provides direct, layer-specific, and quantitative information on the picosecond strain response for structures down to a few nm in thickness, irrespective of the optical properties.…”

Section: Review Articlesmentioning

confidence: 99%

Special issue introduction: Ultrafast photoacoustics

Gusev,

Audoin,

Wright

2024

Photoacoustics

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Towards shaping picosecond strain pulses via magnetostrictive transducers

Cited by 8 publications

References 61 publications

Concepts and use cases for picosecond ultrasonics with x-rays

Concepts and use cases for picosecond ultrasonics with x-rays

Concepts and use cases for picosecond ultrasonics with x-rays

Special issue introduction: Ultrafast photoacoustics

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