Nonlinear optical properties of quantum-confined cdse microcrystallites

S. H. Park, R. A. Morgan, Y. Z. Hu, M. Lindberg, S. W. Koch, N. Peyghambarian

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

Quantum-confinement effects in CdSe microcrystallites in a glass matrix are investigated in the nanosecond time domain. The results of pump-probe and single-beam absorption saturation measurements show strong evidence for electron-hole quantization in the semiconductor microstructures, a different bleaching behavior from those of bulk semiconductors and multiple quantum wells, and a trend of increased saturation intensity with decreased microcrystallite size. A theory for the one- and two-pair states in quantum dots is developed that fully includes the relevant Coulomb interactions. The theory is evaluated numerically, and results are presented for intrinsic quantum dots and for quantum dots with impurities. The experimentally observed nonlinearities are attributed to saturation of one-electron-hole-pair resonances and induced absorption caused by two-pair resonances in the presence or absence of impurities (traps).

Original languageEnglish (US)
Pages (from-to)2097-2105
Number of pages9
JournalJournal of the Optical Society of America B: Optical Physics
Volume7
Issue number10
DOIs
StatePublished - Oct 1990

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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