Strong Enhancement of Nonlinear Optical Properties Through Supramolecular Chirality

Author:

Verbiest Thierry1,Elshocht Sven Van1,Kauranen Martti1,Hellemans Louis1,Snauwaert Johan1,Nuckolls Colin1,Katz Thomas J.1,Persoons André1

Affiliation:

1. T. Verbiest, S. Van Elshocht, M. Kauranen, L. Hellemans, J. Snauwaert, A. Persoons, Laboratory of Chemical and Biological Dynamics, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Heverlee, Belgium. C. Nuckolls and T. J. Katz, Department of Chemistry, Columbia University, New York, NY 10027, USA.

Abstract

A new approach to second-order nonlinear optical (NLO) materials is reported, in which chirality and supramolecular organization play key roles. Langmuir-Blodgett films of a chiral helicene are composed of supramolecular arrays of the molecules. The chiral supramolecular organization makes the second-order NLO susceptibility about 30 times larger for the nonracemic material than for the racemic material with the same chemical structure. The susceptibility of the nonracemic films is a respectable 50 picometers per volt, even though the helicene structure lacks features commonly associated with high nonlinearity. Susceptibility components that are allowed only by chirality dominate the second-order NLO response.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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