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Science 26 November 1993:
Vol. 262. no. 5138, pp. 1419 - 1422
DOI: 10.1126/science.262.5138.1419
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Articles

Nonlinear Optical Properties of Proteins Measured by Hyper-Rayleigh Scattering in Solution

K. Clays 1, E. Hendrickx 1, M. Triest 1, T. Verbiest 1, A. Persoons 1, C. Dehu 2, and J.-L. Brédas 2

1 Laboratory of Chemical and Biological Dynamics, Center for Research on Molecular Electronics and Photonics, University of Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
2 Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Electronique et Photonique Moléculaire, Université de Mons-Hainaut, B-7000 Mons, Belgium

Hyper-Rayleigh scattering has been used to determine the nonlinear optical properties of a chromophore-containing protein in solution. Because the technique of hyper-Rayleigh scattering allows the measurement of hyperpolarizabilities in an isotropic solution without the application of an electric field, this method is ideally suited for the study of proteins that carry a net charge. The observed orientational correlation between the nonlinear optical chromophores in incompletely solubilized protein molecules suggests that guidelines from protein structures can be used for the engineering of supramolecular structures with high optical nonlinearity.

Submitted on June 28, 1993
Accepted on September 7, 1993


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Science. ISSN 0036-8075 (print), 1095-9203 (online)