Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods (Articolo in rivista)

Type
Label
  • Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Creti, A; Anni, M; Zavelani-Rossi, M; Lanzani, G; Manna, L; Lomascolo, M (2008)
    Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods
    in Journal of optics. A, Pure and applied optics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Creti, A; Anni, M; Zavelani-Rossi, M; Lanzani, G; Manna, L; Lomascolo, M (literal)
Pagina inizio
  • 064004 (literal)
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  • 10 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Creti, A.; Lomascolo, M.] CNR, IMM, I-73100 Lecce, Italy; [Creti, A.; Zavelani-Rossi, M.; Lanzani, G.] Politecn Milan, Dipartimento Fis, CNR, INFM,Natl Lab Ultrafast & Ultraintense Opt Sci, I-20133 Milan, Italy; [Anni, M.] Univ Salento, Dipartimento Ingn Innovaz, I-73100 Lecce, Italy; [Manna, L.] INFM, CNR, NNL, I-73100 Lecce, Italy (literal)
Titolo
  • Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods (literal)
Abstract
  • We report on the observation of coherent confined acoustic phonons in CdSe core nanorods. We show that photobleaching and photoabsorption dynamics of nanocrystals, obtained with femtosecond pump-probe transient spectroscopy with a resonant pumping energy, exhibit evidence of oscillatory modulation, due to the modulation of the bandgap, despite the weak excitation regime (< mu J). In particular we found that the modulation frequency corresponds to the coherent radial breathing modes of the rods, suggesting that only the transverse ( radial) mode of coherent phonons is observed. No evidence of modulation is observed in the corresponding rod sample overcoated with a thin shell of CdS/ZnS, suggesting that the shell produces a strongly damped mechanism. (literal)
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