Subpicosecond Spectroscopic Ellipsometry of the Photoinduced Phase Transition in VO2 Thin Films

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2FCZ______%3A_____%2F24%3AN0000024" target="_blank" >RIV/CZ______:_____/24:N0000024 - isvavai.cz</a>
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/acsphotonics.4c01414" target="_blank" >https://pubs.acs.org/doi/10.1021/acsphotonics.4c01414</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acsphotonics.4c01414" target="_blank" >10.1021/acsphotonics.4c01414</a>

Result language
angličtina
Original language name
Subpicosecond Spectroscopic Ellipsometry of the Photoinduced Phase Transition in VO2 Thin Films
Original language description
We report the first application of broadband time-resolved pump−probe ellipsometry to study the ultrafast dynamics of the photoinduced insulatorto-metal transition (IMT) in vanadium dioxide (VO2) thin films driven by 35 fs laser pulses. This novel technique enables the direct measurement of the timeresolved evolution of the complex pseudodielectric function of VO2 during the IMT. We have identified distinct thermal and nonthermal dynamics in the photoinduced IMT, which critically depends on the pump wavelength and fluence, while providing a detailed temporal and spectral phase map. A comparison of the pseudodielectric function of the VO2 thin film during thermally and photoinduced phase transitions reveals that the primary differences in the IMT pathways occur within the first picosecond after the pump, driven by nonequilibrium dynamics in this ultrafast time scale. The ultrafast spectroscopic ellipsometry introduced in this work offers a complementary probe to study phase changes in condensed matter and emerging photonic device materials.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/EF16_019%2F0000789" target="_blank" >EF16_019/0000789: Advanced research using high intensity laser produced photons and particles</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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