Real-Time Detection of Coherent Vibrational Dynamics in TiN Films

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00377172" target="_blank" >RIV/68407700:21340/24:00377172 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1002/adom.202401390" target="_blank" >https://doi.org/10.1002/adom.202401390</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/adom.202401390" target="_blank" >10.1002/adom.202401390</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Real-Time Detection of Coherent Vibrational Dynamics in TiN Films

Popis výsledku v původním jazyce

Titanium nitride (TiN) has recently gained considerable interest because of its remarkable plasmonic properties and for its strong electron–phonon (e–ph) coupling, leading to extremely fast (<100 fs) electron-lattice cooling. Here, the generation of coherent phonons in TiN films is reported, along with their real-time detection by means of broadband transient reflection spectroscopy with sub-15-fs temporal resolution. The measurements show damped oscillations, superimposed to excited state electronic decay. A coherent vibrational mode is revealed, with ~10 THz frequency ascribed to defect-activated normal modes, consistent with spontaneous Raman scattering data, and a dephasing time of ~250 fs. Two π-phase flips are also observed located at photon energies corresponding to interband optical transitions (at 3.2 and 2.5 eV), ascribed to selective coupling of the vibrational mode to these transitions; the energy modulation induced by the vibrational coherence is evaluated. It is shown that the displacive excitation of coherent phonons model describes the coherent response in terms of temporal behavior and of spectral amplitude profile. Overall, a comprehensive and detailed analysis of coherent phonons in TiN films, so far undected, is provided and relevant information on TiN photo-physical properties, potentially useful for its applications, is given.

Název v anglickém jazyce

Real-Time Detection of Coherent Vibrational Dynamics in TiN Films

Popis výsledku anglicky

Titanium nitride (TiN) has recently gained considerable interest because of its remarkable plasmonic properties and for its strong electron–phonon (e–ph) coupling, leading to extremely fast (<100 fs) electron-lattice cooling. Here, the generation of coherent phonons in TiN films is reported, along with their real-time detection by means of broadband transient reflection spectroscopy with sub-15-fs temporal resolution. The measurements show damped oscillations, superimposed to excited state electronic decay. A coherent vibrational mode is revealed, with ~10 THz frequency ascribed to defect-activated normal modes, consistent with spontaneous Raman scattering data, and a dephasing time of ~250 fs. Two π-phase flips are also observed located at photon energies corresponding to interband optical transitions (at 3.2 and 2.5 eV), ascribed to selective coupling of the vibrational mode to these transitions; the energy modulation induced by the vibrational coherence is evaluated. It is shown that the displacive excitation of coherent phonons model describes the coherent response in terms of temporal behavior and of spectral amplitude profile. Overall, a comprehensive and detailed analysis of coherent phonons in TiN films, so far undected, is provided and relevant information on TiN photo-physical properties, potentially useful for its applications, is given.

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

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

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

Advanced Optical Materials

ISSN

2195-1071

e-ISSN

2195-1071

Svazek periodika

12

Číslo periodika v rámci svazku

30

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

001322517500001

EID výsledku v databázi Scopus

2-s2.0-85204028112