Back to Search Start Over

Generation and detection of 50 GHz surface acoustic waves by extreme ultraviolet pulses

Authors :
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Mechanical Engineering
Maznev, AA
Mincigrucci, R
Bencivenga, F
Unikandanunni, V
Capotondi, F
Chen, G
Ding, Z
Duncan, RA
Foglia, L
Izzo, MG
Masciovecchio, C
Martinelli, A
Monaco, G
Pedersoli, E
Bonetti, S
Nelson, KA
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Mechanical Engineering
Maznev, AA
Mincigrucci, R
Bencivenga, F
Unikandanunni, V
Capotondi, F
Chen, G
Ding, Z
Duncan, RA
Foglia, L
Izzo, MG
Masciovecchio, C
Martinelli, A
Monaco, G
Pedersoli, E
Bonetti, S
Nelson, KA
Source :
Applied Physics Letters (AIP)
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.

Details

Database :
OAIster
Journal :
Applied Physics Letters (AIP)
Notes :
application/pdf, English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1342471347
Document Type :
Electronic Resource