Femtosecond Optical Nonlinearities of CdSe Quantum Dots

Nasser Peyghambarian, Brian Fluegel, Markus Lindberg, Daniele Hulin, Manuel Joffre, Arnold Migus, Andre Antonetti, Stephan W. Koch

Research output: Contribution to journalArticle

140 Scopus citations

Abstract

Femtosecond differential absorption measurements of the quantum confined transitions in CdSe microcrystallites are reported. Spectral hole burning is observed, which is accompanied by an induced absorption feature on the high-energy side. The spectral position of the burned hole depends on the excitation wavelength. For excitation on the low-energy side of the lowest quantum-confined transition, a slight shift of the, hole towards the line center is observed. The hole width increases with pump intensity and the magnitude of the induced transparency saturates at our highest excitation level. The results are consistently explained by bleaching of one-pair states and induced absorption caused by the photoexcited two electnon-hole pair states. It is concluded that the presence of one electron in the excited state prevents further absorption of photons at the pair-transitition-energy and accounts for the major portion of the bleaching of the transition.

Original languageEnglish (US)
Pages (from-to)2516-2522
Number of pages7
JournalIEEE Journal of Quantum Electronics
Volume25
Issue number12
DOIs
StatePublished - Dec 1989

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Peyghambarian, N., Fluegel, B., Lindberg, M., Hulin, D., Joffre, M., Migus, A., Antonetti, A., & Koch, S. W. (1989). Femtosecond Optical Nonlinearities of CdSe Quantum Dots. IEEE Journal of Quantum Electronics, 25(12), 2516-2522. https://doi.org/10.1109/3.40636