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Generation and detection of 50 GHz surface acoustic waves by extreme ultraviolet pulses
- Source :
- Applied Physics Letters
- Publication Year :
- 2021
-
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.
- Subjects :
- Diffraction
Materials science
Physics and Astronomy (miscellaneous)
business.industry
Scattering
Free-electron laser
Physics::Optics
02 engineering and technology
Acoustic wave
Surface phonon
021001 nanoscience & nanotechnology
01 natural sciences
Settore FIS/03 - Fisica della Materia
Wavelength
Optics
Brillouin scattering
Extreme ultraviolet
0103 physical sciences
010306 general physics
0210 nano-technology
business
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi.dedup.....7db0363681022cca568a23830368daaa