Resonant enhancement of two-photon absorption in substituted fluorene molecules

Joel M. Hales*, David J. Hagan, Eric W. Van Stryland, K. J. Schafer, A. R. Morales, K. D. Belfield, P. Pacher, O. Kwon, E. Zojer, J. L. Bredas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

120 Scopus citations


The effect of resonance enhancement on the two-photon absorbing properties of fluorene derivatives was investigated. A quantum-chemical calculations of ND-2PA was performed relying on the perturbative sum-over-states (SOS) approach. Both molecules exhibited resonant enhancement of the nonlinearity with the assymetric compound showing as much as a twentyfold increase in δ. The results showed nearly five times enhancement in the value of peak 2PA cross-section for the symmetric compound, whereas the assymetric compound exhibited over threefold enhancement.

Original languageEnglish (US)
Pages (from-to)3152-3160
Number of pages9
Issue number7
StatePublished - Aug 15 2004
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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