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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/EF16_019%2F0000789" target="_blank" >EF16_019/0000789: Pokročilý výzkum s využitím fotonů a částic vytvořených vysoce intenzivními lasery</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ACS Photonics

ISSN

2330-4022

e-ISSN

—

Svazek periodika

11

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

4883-4893

Kód UT WoS článku

001336953800001

EID výsledku v databázi Scopus

2-s2.0-85207114736