Direct evidence of the failure of electric-dipole approximation in second-harmonic generation from a chiral polymer film
- 15 November 1997
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 107 (19) , 8201-8203
- https://doi.org/10.1063/1.475223
Abstract
Second-harmonic generation from Langmuir–Blodgett films of a polythiophene is strongly influenced by the chirality of the polymer. The polarization dependence of the process cannot be explained in the electric-dipole approximation. Evidence of contributions beyond electric dipoles is obtained directly from individual second-harmonic signals.Keywords
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