title: Local field effects in the energy transfer between a chromophore and a carbon nanotube: a single-nanocompound investigation.
abstract: Energy transfer in noncovalently bound porphyrin/carbon nanotube compounds is investigated at the single-nanocompound scale. Excitation spectroscopy of the luminescence of the nanotube shows two resonances arising from intrinsic excitation of the nanotube and from energy transfer from the porphyrin. Polarization diagrams show that both resonances are highly anisotropic, with a preferred direction along the tube axis. The energy transfer is thus strongly anisotropic despite the almost isotropic absorption of porphyrins. We account for this result by local field effects induced by the large optical polarizability of nanotubes. We show that the local field correction extends over several nanometers outside the nanotubes and drives the overall optical response of functionalized nanotubes.
authors.affiliation: Laboratoire de Photonique Quantique et Moléculaire, Institut d'Alembert, CNRS, ENS Cachan, 94235 Cachan, France.
authors.forename: Cyrielle
authors.initials: C
authors.lastname: Roquelet
authors.forename: Fabien
authors.initials: F
authors.lastname: Vialla
authors.forename: Carole
authors.initials: C
authors.lastname: Diederichs
authors.forename: Philippe
authors.initials: P
authors.lastname: Roussignol
authors.forename: Claude
authors.initials: C
authors.lastname: Delalande
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Deleporte
authors.forename: Jean-Sébastien
authors.initials: JS
authors.lastname: Lauret
authors.forename: Christophe
authors.initials: C
authors.lastname: Voisin
mesh_terms: D004574:Electromagnetic Fields; D004735:Energy Transfer; D008422:Materials Testing; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D037742:Nanotubes, Carbon