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Real-time observation of coherent acoustic phonons generated by an acoustically mismatched optoacoustic transducer using x-ray diffraction

Persson, Anna LU ; Enquist, Henrik LU ; Jurgilaitis, Andrius LU ; Andreasson, Pererik LU and Larsson, Jörgen LU (2015) In Applied Physics Reviews 118(18).
Abstract
The spectrum of laser-generated acoustic phonons in indium antimonide coated with a thin nickel film has been studied using time-resolved x-ray diffraction. Strain pulses that can be considered to be built up from coherent phonons were generated in the nickel film by absorption of short laser pulses. Acoustic reflections at the Ni-InSb interface leads to interference that strongly modifies the resulting phonon spectrum. The study was performed with high momentum transfer resolution together with high time resolution. This was achieved by using a third-generation synchrotron radiation source that provided a high-brightness beam and an ultrafast x-ray streak camera to obtain a temporal resolution of 10 ps. We also carried out simulations,... (More)
The spectrum of laser-generated acoustic phonons in indium antimonide coated with a thin nickel film has been studied using time-resolved x-ray diffraction. Strain pulses that can be considered to be built up from coherent phonons were generated in the nickel film by absorption of short laser pulses. Acoustic reflections at the Ni-InSb interface leads to interference that strongly modifies the resulting phonon spectrum. The study was performed with high momentum transfer resolution together with high time resolution. This was achieved by using a third-generation synchrotron radiation source that provided a high-brightness beam and an ultrafast x-ray streak camera to obtain a temporal resolution of 10 ps. We also carried out simulations, using commercial finite element software packages and on-line dynamic diffraction tools. Using these tools, it is possible to calculate the time-resolved x-ray reflectivity from these complicated strain shapes. The acoustic pulses have a peak strain amplitude close to 1%, and we investigated the possibility to use this device as an x-ray switch. At a bright source optimized for hard x-ray generation, the low reflectivity may be an acceptable trade-off to obtain a pulse duration that is more than an order of magnitude shorter. (C) 2015 Author(s). (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
Applied Physics Reviews
volume
118
issue
18
publisher
American Institute of Physics
external identifiers
  • wos:000365041700042
  • scopus:84947231955
ISSN
0021-8979
DOI
10.1063/1.4935269
language
English
LU publication?
yes
id
8dd93705-64d2-47bf-84a2-187cf85fd3f3 (old id 8370700)
date added to LUP
2015-12-17 08:53:21
date last changed
2017-10-22 03:08:23
@article{8dd93705-64d2-47bf-84a2-187cf85fd3f3,
  abstract     = {The spectrum of laser-generated acoustic phonons in indium antimonide coated with a thin nickel film has been studied using time-resolved x-ray diffraction. Strain pulses that can be considered to be built up from coherent phonons were generated in the nickel film by absorption of short laser pulses. Acoustic reflections at the Ni-InSb interface leads to interference that strongly modifies the resulting phonon spectrum. The study was performed with high momentum transfer resolution together with high time resolution. This was achieved by using a third-generation synchrotron radiation source that provided a high-brightness beam and an ultrafast x-ray streak camera to obtain a temporal resolution of 10 ps. We also carried out simulations, using commercial finite element software packages and on-line dynamic diffraction tools. Using these tools, it is possible to calculate the time-resolved x-ray reflectivity from these complicated strain shapes. The acoustic pulses have a peak strain amplitude close to 1%, and we investigated the possibility to use this device as an x-ray switch. At a bright source optimized for hard x-ray generation, the low reflectivity may be an acceptable trade-off to obtain a pulse duration that is more than an order of magnitude shorter. (C) 2015 Author(s).},
  articleno    = {185308},
  author       = {Persson, Anna and Enquist, Henrik and Jurgilaitis, Andrius and Andreasson, Pererik and Larsson, Jörgen},
  issn         = {0021-8979},
  language     = {eng},
  number       = {18},
  publisher    = {American Institute of Physics},
  series       = {Applied Physics Reviews},
  title        = {Real-time observation of coherent acoustic phonons generated by an acoustically mismatched optoacoustic transducer using x-ray diffraction},
  url          = {http://dx.doi.org/10.1063/1.4935269},
  volume       = {118},
  year         = {2015},
}