Design strategies and structure-property relationships for two-photon absorption in conjugated molecules are described on the basis of correlated quantum-chemical calculations. We first focus on stilbene derivatives with centrosymmetric structures. We found that derivatization of the conjugated molecule with electroactive groups in a quadrupolar-like arrangement leads to a large increase in the two-photon absorption cross section, δ. Next, we consider a noncentrosymmetric dipolar compound built by grafting donor and acceptor end-groups on stilbene. In this case also, the calculations predict huge enhancement factors in δ upon substitution. In both cases (centrosymmetric and noncentrosymmetric compounds), the quantum-chemical description provides rich insight into the mechanisms for the two-photon absorption phenomenon.
|Original language||English (US)|
|Number of pages||20|
|Journal||Molecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics|
|State||Published - Jun 1999|
ASJC Scopus subject areas
- Control and Systems Engineering
- Condensed Matter Physics