Physical Review Materials, volume 4, issue 12, publication number 125201
Photoelasticity of VO2 nanolayers in insulating and metallic phases studied by picosecond ultrasonics
Mogunov Ia. A.
1
,
Lysenko S
2
,
Lysenko S.I.
2
,
Fernández Félix
2
,
Rúa Armando
2
,
Muratov A. V.
3
,
Kent A.D.
4
,
2
Department of Physics, University of Puerto Rico, Mayaguez, Puerto Rico 00681, USA
|
Publication type: Journal Article
Publication date: 2020-12-14
Journal:
Physical Review Materials
Quartile SCImago
Q1
Quartile WOS
Q3
Impact factor: 3.4
ISSN: 24759953
General Materials Science
Physics and Astronomy (miscellaneous)
Abstract
We use a picosecond ultrasonic technique to evaluate the photoelastic parameters at the wavelength of 1028 nm in epitaxial vanadium dioxide $({\mathrm{VO}}_{2})$ nanolayers grown on c-cut sapphire substrates. In the experiments, we monitor the picosecond evolution of the reflectivity of ${\mathrm{VO}}_{2}$ in insulating and metallic phases under the impact of a picosecond longitudinal strain pulse injected into the nanolayer from the side of the substrate. We show that in a 145-nm-thick granular nanolayer, the temporal features of the reflectivity are clearly dependent on the phase state of ${\mathrm{VO}}_{2}$, showing the change of the photoelastic parameters upon the insulator-metal transition. Analytical consideration and numerical simulations of the optical response to the picosecond strain pulse show that the temporal evolution of the reflectivity strongly depends on the complex photoelastic parameter. The analysis enables us to obtain the values of the photoelastic parameters in the studied nanolayer in both insulating and metallic phases. We find that for a 145-nm film of ${\mathrm{VO}}_{2}$ in an insulating state the imaginary part of the photoelastic constant is negligible. This means that in the insulating phase the strain does not affect the optical absorption of ${\mathrm{VO}}_{2}$. In the metallic phase, the photoelastic parameter of ${\mathrm{VO}}_{2}$ is found to be similar to that typical for metals with positive real and negative imaginary parts. We further show that the optical response to the strain pulse in the layer consisting of disconnected ${\mathrm{VO}}_{2}$ nanohillocks with an average height of 70 nm is governed by their morphology and is different from what is predicted in the plane ${\mathrm{VO}}_{2}$ films.
Citations by journals
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1
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International Journal of Mechanical Sciences
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International Journal of Mechanical Sciences
1 publication, 50%
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Photoacoustics
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Photoacoustics
1 publication, 50%
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1
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Citations by publishers
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1
2
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Elsevier
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Elsevier
2 publications, 100%
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1
2
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Mogunov I. A. et al. Photoelasticity of VO2 nanolayers in insulating and metallic phases studied by picosecond ultrasonics // Physical Review Materials. 2020. Vol. 4. No. 12. 125201
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Mogunov I. A., Lysenko S., Lysenko S., Fernández F., Rúa A., Muratov A. V., Kent A., Kalashnikova A., Akimov A. Photoelasticity of VO2 nanolayers in insulating and metallic phases studied by picosecond ultrasonics // Physical Review Materials. 2020. Vol. 4. No. 12. 125201
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TY - JOUR
DO - 10.1103/PhysRevMaterials.4.125201
UR - https://doi.org/10.1103%2FPhysRevMaterials.4.125201
TI - Photoelasticity of VO2 nanolayers in insulating and metallic phases studied by picosecond ultrasonics
T2 - Physical Review Materials
AU - Mogunov, Ia. A.
AU - Lysenko, S
AU - Fernández, Félix
AU - Rúa, Armando
AU - Muratov, A. V.
AU - Kent, A.D.
AU - Kalashnikova, A.M.
AU - Akimov, A.V.
AU - Lysenko, S.I.
PY - 2020
DA - 2020/12/14 00:00:00
PB - American Physical Society (APS)
IS - 12
VL - 4
SN - 2475-9953
ER -
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@article{2020_Mogunov,
author = {Ia. A. Mogunov and S Lysenko and Félix Fernández and Armando Rúa and A. V. Muratov and A.D. Kent and A.M. Kalashnikova and A.V. Akimov and S.I. Lysenko},
title = {Photoelasticity of VO2 nanolayers in insulating and metallic phases studied by picosecond ultrasonics},
journal = {Physical Review Materials},
year = {2020},
volume = {4},
publisher = {American Physical Society (APS)},
month = {dec},
url = {https://doi.org/10.1103%2FPhysRevMaterials.4.125201},
number = {12},
doi = {10.1103/PhysRevMaterials.4.125201}
}