Development of New Nonlinear Optical Materials for Application to Sensor Protection.

Abstract

New ladder chromophores were synthesized and characterized for sensor protection applications. A similar effort was carried out for selected metallated pi-electron oligomers. Optical nonlinearity was characterized by both degenerate four-wave mixing (employing both femto- and picosecond pulses) and by pump-probe experiments. Large photo-induced absorption was observed for the new ladder chromophores. In all cases studied, the photo-induced absorption phenomena could be quantitatively described by a three level model. Relaxation to a highly absorbing 'gap' state was found to be preferred to direct electron-hole recombination. the relaxation time of the gap state was observed to vary from 40 picoseconds to 10 nanoseconds for various materials studied. The absorption cross section of the gap state was observed to be at least an order of magnitude greater than that of the ground state.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1996
Accession Number
ADA318773

Entities

People

  • Edward M. Healy
  • Larry Dalton

Organizations

  • University of Southern California

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Absorption
  • Absorption Cross Sections
  • Absorption Spectra
  • Alkenes
  • Chemical Synthesis
  • Chemistry
  • Chlorides
  • Electrons
  • Ground State
  • Materials
  • Materials Science
  • Molecules
  • Optical Materials
  • Optical Properties
  • Optics
  • Organic Materials
  • Wave Mixing

Fields of Study

  • Physics

Readers

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

Technology Areas

  • Microelectronics