Ultrafast optical nonlinearities of CdSe quantum dots

D. Hulin, M. Joffre, A. Migus, A. Antonetti, Nasser Peyghambarian, B. Fluegel, Stephan W. Koch

Research output: Contribution to conferencePaper

Abstract

Femtosecond differential absorption measurements have been performed on the quantum-confined transitions in CdSe microcrystallites. Spectral hole burning accompanied by increased absorption on the high-energy side is observed. The spectral positions of the induced features depend on the excitation wavelength. For excitation on the low-energy side of the lowest quantum confined transition, a shift of the burned hole with respect to the pump frequency is observed. It is explained in the framework of an inhomogeneous absorption line composed of broad homogeneous lines. A 25 ± 10-fs dephasing time is obtained from the measurements. The results are explained by bleaching of one-pair states and induced absorption caused by the photoexcited two-electron-hole-pair states. It is concluded that Coulomb effects are important even in quantum dots. They give rise to a ground state two-pair resonance on the low-energy side of the one-pair state and to higher-energy two-pair resonances which are spectrally located between the one-pair states.

Original languageEnglish (US)
Pages178-179
Number of pages2
StatePublished - Dec 1 1990
Event17th International Conference on Quantum Electronics - IQEC '90 - Anaheim, CA, USA
Duration: May 21 1990May 25 1990

Other

Other17th International Conference on Quantum Electronics - IQEC '90
CityAnaheim, CA, USA
Period5/21/905/25/90

ASJC Scopus subject areas

  • Engineering(all)

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    Hulin, D., Joffre, M., Migus, A., Antonetti, A., Peyghambarian, N., Fluegel, B., & Koch, S. W. (1990). Ultrafast optical nonlinearities of CdSe quantum dots. 178-179. Paper presented at 17th International Conference on Quantum Electronics - IQEC '90, Anaheim, CA, USA, .