Electro-optical characterizations of the large second-order optical nonlinearity of C_(60) Langmuir-Blodgett films

摘要

The second-order optical nonlinearity of C_(60) was deduced from the Pockels response of mixed C_(60)-arachidic acid Langmuir-Blodgett monolayers by using electro-optically modulated attenuated total reflection spectroscopy. We obtained a considerable second-order susceptibility for C_(60) of χ~(@(2)) = 0.5 × 10~(-12)m V~(-1) (namely 1.3 × 10~(-9) esu) which is in agreement with that obtained from the measurement of second-harmonic generation and attributed to the electrical quadrupole and/or magnetic dipole contributions of C_(60) molecules.