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Nondestructive Complete Mechanical Characterization of Zinc Blende and Wurtzite GaAs Nanowires Using Time-Resolved Pump− Probe Spectroscopy

Mante, Pierre-Adrien LU ; Lehmann, Sebastian LU ; Anttu, Nicklas LU ; Dick, Kimberly LU and Yartsev, Arkady LU (2016) In Nano Letters 16(8). p.4792-4798
Abstract
We have developed and demonstrated an experimental method, based on the picosecond acoustics technique, to perform nondestructive complete mechanical characterization of nanowires, that is, the determination of the complete elasticity tensor. By means of femtosecond pump−probe spectroscopy, coherent acoustic phonons were generated in an ensemble of nanowires and their dynamics was resolved. Specific phonon modes were identified and the detection mechanism was addressed via wavelength dependent experiments. We calculated the exact phonon dispersion relation of the nanowires by fitting the experimentally observed frequencies, thus allowing the extraction of the complete elasticity tensor. The elasticity tensor and the nanowire diameter were... (More)
We have developed and demonstrated an experimental method, based on the picosecond acoustics technique, to perform nondestructive complete mechanical characterization of nanowires, that is, the determination of the complete elasticity tensor. By means of femtosecond pump−probe spectroscopy, coherent acoustic phonons were generated in an ensemble of nanowires and their dynamics was resolved. Specific phonon modes were identified and the detection mechanism was addressed via wavelength dependent experiments. We calculated the exact phonon dispersion relation of the nanowires by fitting the experimentally observed frequencies, thus allowing the extraction of the complete elasticity tensor. The elasticity tensor and the nanowire diameter were determined for zinc blende GaAs nanowires and were found to be in a good agreement with literature data and independent measurements. Finally, we have applied this technique to characterize wurtzite GaAs nanowires, a metastable phase in bulk, for which no experimental values of elastic constants are currently available. Our results agree well with previous first principle calculations. The proposed approach to the complete and nondestructive mechanical characterization of nanowires will allow the efficient mechanical study of new crystal phases emerging in nanostructures, as well as size-dependent properties of nanostructured materials. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
femtosecond laser, nanowires, zinc blende, wurtzite, elasticity tensor
in
Nano Letters
volume
16
issue
8
pages
7 pages
publisher
The American Chemical Society
external identifiers
  • Scopus:84981331820
ISSN
1530-6992
DOI
10.1021/acs.nanolett.6b00786
language
English
LU publication?
yes
id
30b57633-0c7d-47a6-9b89-987a951d8c1e
date added to LUP
2016-09-21 16:45:14
date last changed
2016-12-06 15:13:09
@misc{30b57633-0c7d-47a6-9b89-987a951d8c1e,
  abstract     = {We have developed and demonstrated an experimental method, based on the picosecond acoustics technique, to perform nondestructive complete mechanical characterization of nanowires, that is, the determination of the complete elasticity tensor. By means of femtosecond pump−probe spectroscopy, coherent acoustic phonons were generated in an ensemble of nanowires and their dynamics was resolved. Specific phonon modes were identified and the detection mechanism was addressed via wavelength dependent experiments. We calculated the exact phonon dispersion relation of the nanowires by fitting the experimentally observed frequencies, thus allowing the extraction of the complete elasticity tensor. The elasticity tensor and the nanowire diameter were determined for zinc blende GaAs nanowires and were found to be in a good agreement with literature data and independent measurements. Finally, we have applied this technique to characterize wurtzite GaAs nanowires, a metastable phase in bulk, for which no experimental values of elastic constants are currently available. Our results agree well with previous first principle calculations. The proposed approach to the complete and nondestructive mechanical characterization of nanowires will allow the efficient mechanical study of new crystal phases emerging in nanostructures, as well as size-dependent properties of nanostructured materials.},
  author       = {Mante, Pierre-Adrien and Lehmann, Sebastian and Anttu, Nicklas and Dick, Kimberly and Yartsev, Arkady},
  issn         = {1530-6992},
  keyword      = {femtosecond laser,nanowires,zinc blende,wurtzite,elasticity tensor},
  language     = {eng},
  month        = {06},
  number       = {8},
  pages        = {4792--4798},
  publisher    = {ARRAY(0x6254200)},
  series       = {Nano Letters},
  title        = {Nondestructive Complete Mechanical Characterization of Zinc Blende and Wurtzite GaAs Nanowires Using Time-Resolved Pump− Probe Spectroscopy},
  url          = {http://dx.doi.org/10.1021/acs.nanolett.6b00786},
  volume       = {16},
  year         = {2016},
}