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Intermolecular Coupling Enhancement of the Molecular Hyperpolarizability in Multi-chromophoric Dipolar Dendrons

Published online by Cambridge University Press:  21 March 2011

Shiyoshi Yokoyama ,
Akira Otomo  and
Shinro Mashiko
Shiyoshi Yokoyama
Affiliation:
Communications Research Laboratory, 588-2 Iwaoka, Nishi-ku, Kobe 651-2429, JAPAN
Akira Otomo
Affiliation:
Communications Research Laboratory, 588-2 Iwaoka, Nishi-ku, Kobe 651-2429, JAPAN
Shinro Mashiko
Affiliation:
Communications Research Laboratory, 588-2 Iwaoka, Nishi-ku, Kobe 651-2429, JAPAN
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Abstract

Nonlinear optical dendritic macromolecules, called “azobenzene dendrons”, having a branching structure modified with a second-order nonlinear optical chromophore has been synthesized. An electron donor and acceptor azobenzene chromophore having a large molecular hyperpolarizability of β0=150E-30 esu, was chosen. The electronic structure of synthesized dendrons, which were expected to become dipolar due to their intermolecular attractive interaction, was proven by second-order nonlienar optical properties. The molecular hyperpolarizabilities of azobenzene dendrons were measured by the hypr-Rayleigh scattering technique. The highest molecular hyperpoalrizability was found to be 3,010E-30 esu for an azobenzene dendron having 15 chromophoric unit, where each chromophore coherently contribute to the second harmonic generation. This level of the molecular hyperpolarizability was much larger than that for a monomeric azobenzene chromophore.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 598: Symposium BB – Electrical, Optical, & Magenetic Properties...V , 1999 , BB3.9
Copyright
Copyright © Materials Research Society 1999

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