Resonant optical nonlinearity of conjugated polymers

Ming Che Chang, Hsin Fei Meng

Research output: Contribution to journalArticle

Abstract

When the energy of a pump wave is in resonance with the exciton creation energy, the electric susceptibility of a conjugated polymer in response to the probe wave is altered by the exciton gas. In this paper we calculate the dependence of this change on the exciton populations by the equation of motion (EOM) method. The magnitude of optical nonlinearity is also influenced by ambient temperature, by the extent of exciton wave functions, and by the strength of electron-electron interaction. All of these factors can be easily incorporated in the EOM approach systematically. Using the material parameters for polydiacetylene, the optical Kerr coefficient (Formula presented) obtained is about (Formula presented) which is close to experimental value, and is four orders of magnitude larger than the value in nonresonant pump experiments.

Original languageEnglish
Pages (from-to)12277-12284
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number19
DOIs
Publication statusPublished - 1997 Jan 1

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Conjugated polymers
Excitons
nonlinearity
excitons
polymers
Equations of motion
equations of motion
Pumps
pumps
Electron-electron interactions
Wave functions
ambient temperature
electron scattering
Gases
wave functions
magnetic permeability
LDS 751
energy
probes
coefficients

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Resonant optical nonlinearity of conjugated polymers. / Chang, Ming Che; Meng, Hsin Fei.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 56, No. 19, 01.01.1997, p. 12277-12284.

Research output: Contribution to journalArticle

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