Femtomagnétisme et dynamique de spin (FEMTOMAG)

Nous étudions les propriétés dynamiques des électrons et des spins dans les métaux et les systèmes moléculaires. Nous sommes particulièrement intéressés à la dynamique des phases corrélées de spins (ferromagnétisme ou ferrimagnétisme), à la dynamique des excitations électroniques collectives (plasmons) dans les métaux ainsi qu’à la dynamique vibrationnelle associée au mouvement moléculaire. Nous développons actuellement quatre principales activités de recerche (pour en savoir plus cliquer sur les liens en haut de page) :
* Dynamique d’aimantation ultra-rapide
* Photonique de Spins
* Dynamique des plasmons de surface de nanostructures métalliques
* Dynamique moléculaire ultra-rapide (dynamique de paquets d’ondes dans des polymères conjugués et des aimants moléculaires.

Instrumentation et Techniques

Les méthodes expérimentales que nous utilisons nous permettent de réaliser des expériences optiques et magnéto-optiques résolues en temps avec une résolution temporelle femtoseconde dans une gamme de temps comprise entre quelques dizaines de femtosecondes jusqu’à 1 nanoseconde.

Sources laser femtosecondes :

Oscillateurs 80 MHz, 800 nm, 500 mW (20 fs & 100 fs) ; sources amplifiées à 5 kHz : (120 fs, 200 μJ/impulsion) et (40 fs, 500 μJ/impulsion). Génération de second harmonique (pompe à 400 nm) et génération de continuum spectral (sonde dans le visible 500-800 nm) ; amplificateur paramétrique optique dans le proche infra-rouge (5 kHz, 100 fs, 1.5 – 3 μm) ; différence de fréquence dans l’infra-rouge moyen (5 kHz, 300 fs, 5-10 μm).

Techniques de mesures :

Effets Kerr et Faraday magnéto-optiques résolus en temps ; Microscopie Kerr confocale femtoseconde (résolutions spatiale et temporelle de 300 nm et 150 fs) ; Spectroscopie pompe-sonde femtoseconde (réflectivité et transmission différentielles) ; échos de photons et mélange d’ondes résolus en temps ; Spectroscopie pompe-sonde et mesures magnéto-optiques à basses températures (50 – 300 K).

ACTIVITES

Dynamique Moléculaire Femtoseconde

Photonique de Spins

Dynamique de Plasmons de Surface : Nanostructures Métalliques

Dynamique de Spins Ultra-rapide

Membres de l’équipe :

Ingénieure de Recherche, Optique Ultra-rapide et Nanophotonique (DON)Marie.Barthelemy@ipcms.unistra.fr
Tél: +33(0)3 88 10 72 51Bureau: 2408
Ingénieur de Recherche, Optique Ultra-rapide et Nanophotonique (DON)jean.besbas@ipcms.unistra.fr
Tél: /Bureau: 2408
Voir la page personnelle
Professeure, Optique Ultra-rapide et Nanophotonique (DON)Valerie.Halte@ipcms.unistra.fr
Tél: +33(0)3 88 10 72 13Bureau: 2406
Voir la page personnelle
Ingénieur de Recherche, Optique Ultra-rapide et Nanophotonique (DON)Mircea.Vomir@ipcms.unistra.fr
Tél: +33(0)3 88 10 72 16Bureau: 2409

Publications récentes :

1839302 JZU5CN8N 2024 1 surface-science-reports 50 creator asc year 1566 https://www.ipcms.unistra.fr/plugins/zotpress/
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1839302 JZU5CN8N 2023 1 surface-science-reports 50 creator asc year 1566 https://www.ipcms.unistra.fr/plugins/zotpress/
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1839302 JZU5CN8N 2021 1 surface-science-reports 50 creator asc year 1566 https://www.ipcms.unistra.fr/plugins/zotpress/
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1839302 JZU5CN8N 2020 1 surface-science-reports 50 creator asc year 1566 https://www.ipcms.unistra.fr/plugins/zotpress/
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1839302 JZU5CN8N 2019 1 surface-science-reports 50 creator asc year 1566 https://www.ipcms.unistra.fr/plugins/zotpress/
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Dynamique Moléculaire Femtoseconde

Photonique de Spins

Dynamique de Plasmons de Surface : Nanostructures Métalliques

Dynamique de Spins Ultra-rapide