Nonlinear Optical Properties and Subpicosecond Dynamics of Excitons and Electron-Hole Plasmas in Multiple Quantum Well Structures.

Abstract

Time resolved photoluminescence measurements are reported for Molecular Beam Epitaxially-grown AlxGa(1-x) As samples having alloy compositions which result in both direct gap and indirect gap materials. Quantitative results have been obtained for bandgap renormalization inducted at high carrier densities and the results compared with a theoretical model. Ultrafast spectroscopy measurements on an MBE grown x=0.52 sample following optical excitation well above the bandgap show presistent bleaching of the direct absorption, inducted absorption below the fundamental absorption edge and a blue shift by Fabry Perot fringes in the transparent spectral region. Keywords: Aluminum gallium arsenide; Photoluminescence; Transient absorption; Nonlinear optics; Quantum wells; Superlattices; III-V ternary alloys; Bandgap renormalization.

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Document Details

Document Type
Technical Report
Publication Date
Jan 26, 1987
Accession Number
ADA179855

Entities

People

  • A. L. Smirl
  • J. F. Lam
  • R. A. Mcfarlane

Organizations

  • HRL Laboratories

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Band Gaps
  • Classification
  • Diffraction
  • Dynamics
  • Electron Holes
  • Electrons
  • Energy Bands
  • Energy Transfer
  • Excitons
  • Fermi Levels
  • Optical Properties
  • Picosecond Time
  • Quantum Wells
  • Scientific Research
  • Spectra
  • Two Photon Absorption

Fields of Study

  • Materials science

Readers

  • Optical Physics and Photonics.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.

Technology Areas

  • Microelectronics
  • Quantum Computing