Invited paper: Excitonic optical nonlinearities in ZnSe epitaxial films

J. E. Potts, H. Cheng, S. H. Park, B. Fluegel, M. Joffre, S. W. Koch, N. Peyghambarian

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Excitonic optical nonlinearities in epitaxial ZnSe thin films have been measured at 150 and 300K. The measured nonlinear response, Δn/N = 1.8×10−19 cm3 at 300K, is comparable to that observed in bulk GaAs and GaAs/AlGaAs multiple quantum well systems. Analysis of these results using our partly-phenomenological plasma theory indicates that the mechanisms responsible for this nonlinearity at room temperature are exciton screening and density-dependent broadening. At 150K, exciton screening makes the major contribution to the nonlinearity. Using femtosecond laser techniques, we have determined that the nonlinearity turns off in times on the order of 50-100 ps. These excitonic nonlinearities are, therefore, both large in magnitude and extremely rapid.

Original languageEnglish (US)
Pages (from-to)107-113
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume881
DOIs
StatePublished - May 3 1988

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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