Objectif We propose a time-resolved Terahertz (THz) investigation of ultra-fast dynamics in semimetals and carbon nanotubes. The THz spectroscopy is a direct and powerful tool to explore the optical properties in the far- and mid-infrared. When combined with a visible pump beam, it can measure the transient dielectric response of an excited system with time resolution better than 100fs.This unique capability has been already exploited to observe the building up of electron-hole plasma in semiconductors and the exci tonic transitions in heterostructures. On the track of these promising results, we aim to characterize hot electrons dynamics in graphite. Our goal is to extend the investigation to the carbon nanotubes and observe the influences of the reduced dimensionality on the fast conductivity transients.The project chaises also the optimisation of innovative gas sensors that would detect toxic and polluting species. It is well established that the conductivity of metal-phtalocyanine films changes dramatically under NOx exposure. Together with the electronic transport, also the thickness and the optical properties of the film modify considerably. We propose a THz investigation of these solid-gas systems in order to characterize the plasma frequency, the quasiparticle scattering rate and the molecular vibration during the absorption of the sensing gas. Champ scientifique engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringsensorsnatural sciencesphysical scienceselectromagnetism and electronicssemiconductivitynatural sciencesphysical sciencesopticsspectroscopy Mots‑clés TeraHertz carbon-nanotubes gas graphite hot-electrons metal-phthalocyanine pump-probe sensors ultrafast Programme(s) FP6-MOBILITY - Human resources and Mobility in the specific programme for research, technological development and demonstration "Structuring the European Research Area" under the Sixth Framework Programme 2002-2006 Thème(s) MOBILITY-2.1 - Marie Curie Intra-European Fellowships (EIF) Appel à propositions FP6-2002-MOBILITY-5 Voir d’autres projets de cet appel Régime de financement EIF - Marie Curie actions-Intra-European Fellowships Coordinateur FREIE UNIVERSITAET BERLIN Contribution de l’UE Aucune donnée Adresse Kaiserswerther Str. 16-18 BERLIN Allemagne Voir sur la carte Liens Site web Opens in new window Coût total Aucune donnée
