Intermolecular coupling enhancement of the molecular hyperpolarizability in NLO dendrons

S. Yokoyama, S. Mashiko

Research output: Contribution to journalConference articlepeer-review


Nonlinear optical dendritic macromolecules, called azobenzene dendrons, were synthesized by adding 1-15 azobenzene branching units as second-order nonlinear optical chromophore and placing aliphatic chains at the chain end. The electronic structure of azobenzene dendrons, which were expected to become dipolar, was proven by second-order nonlinear optical properties. The hyper-Rayleigh scattering result indicated that they had a rod-shaped molecular structure, where chromophoric units were oriented noncentrosymmetrically along the molecular axis and each of units coherently contributed to the second harmonic generation. The first-order molecular hyperpolarizability was 3,010 × 10-30 esu for an azobenzene dendron having 15 azobenzene chromophores. This level of hyperpolarizability was significantly higher than the hyperpolarizability of 150 × 10-30 esu for a momomeric azobenzene chromophore.

Original languageEnglish
Pages (from-to)47-50
Number of pages4
JournalMolecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics
Issue number1-2
Publication statusPublished - 2000
Externally publishedYes
EventChitose Internatinal Forum on Photonic Sciences - Chitose, Japan
Duration: Oct 12 1999Oct 13 1999

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Condensed Matter Physics


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