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Large non-thermal contribution to picosecond strain pulse generation using photo-induced phase transition in VO2

Mogunov, Iaroslav A.; Lysenko, Sergiy; Fedianin, Anatolii E.; Fernández, Félix E.; Rúa, Armando; Kent, Anthony J.; Akimov, Andrey V.; Kalashnikova, Alexandra M.

Authors

Iaroslav A. Mogunov *mogunov@mail.ioffe.ru

Sergiy Lysenko

Anatolii E. Fedianin

Félix E. Fernández

Armando Rúa

Anthony J. Kent

Andrey V. Akimov

Alexandra M. Kalashnikova



Abstract

Picosecond strain pulses are a versatile tool for investigation of mechanical properties of meso-and nano-scale objects with high temporal and spatial resolutions. Generation of such pulses is traditionally realized via ultrafast laser excitation of a light-to-strain transducer involving thermoelastic, deformation potential, or inverse piezoelectric effects. These approaches unavoidably lead to heat dissipation and a temperature rise, which can modify delicate specimens, like biological tissues, and ultimately destroy the transducer itself limiting the amplitude of generated picosecond strain. Here we propose a novel non-thermal mechanism for generating picosecond strain pulses via ultrafast photo-induced first-order phase transitions (PIPTs). We perform experiments on vanadium dioxide VO2 films, which exhibit a first-order PIPT accompanied by a lattice change. We demonstrate that during femtosecond optical excitation of VO2 the PIPT alone contributes to ultrafast expansion of this material as large as 0.45%, which is not accompanied by heat dissipation, and, for excitation density of 8 mJ cm-2 , exceeds the contribution from thermoelastic effect by the factor of five. 2

Journal Article Type Article
Publication Date Apr 3, 2020
Journal Nature Communications
Electronic ISSN 2041-1723
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 11
Article Number 1690
APA6 Citation Mogunov, I. A., Lysenko, S., Fedianin, A. E., Fernández, F. E., Rúa, A., Kent, A. J., …Kalashnikova, A. M. (2020). Large non-thermal contribution to picosecond strain pulse generation using photo-induced phase transition in VO2. Nature Communications, 11, https://doi.org/10.1038/s41467-020-15372-z
DOI https://doi.org/10.1038/s41467-020-15372-z
Publisher URL https://www.nature.com/articles/s41467-020-15372-z

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