Generation and detection of 50 GHz surface acoustic waves by extreme ultraviolet pulses
Name
5.0060575.pdf
Description
Published version
Size
1.41 MB
Format
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Checksum (MD5)
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Author(s)
Maznev, AA
Mincigrucci, R
Bencivenga, F
Unikandanunni, V
Capotondi, F
Chen, G
Ding, Z
Duncan, RA
Foglia, L
Izzo, MG
Date Issued
2021
Journal
Applied Physics Letters
Publisher
AIP Publishing
Citation
Maznev, AA, Mincigrucci, R, Bencivenga, F, Unikandanunni, V, Capotondi, F et al. 2021. "Generation and detection of 50 GHz surface acoustic waves by extreme ultraviolet pulses." Applied Physics Letters, 119 (4).
Version
Final published version
Abstract
We use femtosecond extreme ultraviolet pulses derived from a free electron laser to excite and probe surface acoustic waves (SAWs) on the
(001) surface of single crystal SrTiO3. SAWs are generated by a pair of 39.9 nm pulses crossed at the sample with the crossing angle defining
the SAW wavelength at 84 nm. Detection of SAWs is performed via diffraction of a time-delayed 13.3 nm probe pulse by SAW-induced surface ripples. Despite the low reflectivity of the sample in the extreme ultraviolet range, the reflection mode detection is found to be efficient
because of an increase in the diffraction efficiency for shorter wavelengths. We describe a methodology for extracting the SAW attenuation
in the presence of a thermal grating, which is based on measuring the decay of oscillations at twice the SAW frequency. The proposed
approach can be used to study ultrahigh frequency SAWs in a broad range of materials and will bridge the wave vector gap in surface phonon
spectroscopy between Brillouin scattering and He atom scattering.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1063/5.0060575
