Large third-order optical nonlinearity realized in symmetric nonpolar carotenoids

Masazumi Fujiwara, Kensei Yamauchi, Mitsuru Sugisaki, Kazuhiro Yanagi, Andrew Gall, Bruno Robert, Richard J. Cogdell, Hideki Hashimoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We show that a very large enhancement of third-order optical nonlinearity (γ) of π -conjugated molecules can be realized without a major redshift of the absorption spectrum that disturbs optical transparency in the visible region. By changing the number (n) of C=C bonds of β carotene (n=11) from 7 to 15, a remarkable 3.4-fold increase in the γ value was observed when n=15 relative to that of β carotene. This enhancement of γ mainly originates from three-photon resonance of a lowest optically allowed excited state. The controversial higher-lying essential state is not important for generating the large value of γ.

Original languageEnglish
Article number161101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number16
DOIs
Publication statusPublished - Oct 7 2008
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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