Abstract
Current interest in organic molecules with large second-order hyperpolarizabilities β has produced a need for simple measurement techniques to provide feedback for molecular engineering efforts. Heinz et al.1 have shown that surface second harmonic generation (SSHG) can be used to determine β for uniaxial molecules which adsorb noncentro-symmetrically on fused silica surfaces. We carried out a comparison of β measurements using SSHG and the electric-field-induced second harmonic (EFISH) generation on parasubstituted benzoic acids (R-C6H4COOH; R = donor, acceptor groups) and nitrobenzenes (R′-C6H4NO2) in an effort to gauge the relative merits of both techniques.
© 1987 Optical Society of America
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