Electro-absorption in a polydiacetylene

Y. Kawabe, F. Jarka, N. Peyghambarian, Dandan Guo, S. Mazumdar, S. N. Dixit, F. Kajzar

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The electro-absorption in a DCH-polydiacetylene has been investigated both experimentally and theoretically. In addition to the red Stark shift of the exciton, a significant feature in the difference spectrum is observed at a higher energy. Within an interacting electron model (extended Peierls-Hubbard model), the roles played by the dipole-allowed one-photon states and the dipole-forbidden two-photon states are studied in detail. It is found that the high-energy signals in the difference spectrum are due to the strong field-induced mixing of the one-photon state at the edge of a continuum structure, or 'conduction band' in the language of band theory, with its neighboring two-photon states. Contributions to the electro-absorption from the one- and two-photon states cancel deep within the band. Three-photon resonance due to the band edge is expected in third-harmonic generation (THG) and has been seen in both a polydiacetylene and in polysilanes.

Original languageEnglish (US)
Pages (from-to)517-523
Number of pages7
JournalSynthetic Metals
Issue number1-3
StatePublished - Aug 15 1992

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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