Determination of the orientational order parameters in a polysilane LB film via polarization-dependent THG

摘要

Abstract: We demonstrate resonant third harmonic generation as a powerful tool for analyzing the quasi 2-D molecular orientational order in a Langmuir-Blodgett film of poly(bis-m-butoxyphenylsilane). By recording Maker-fringes at different angles between the polarization of the fundamental beam and the dipping direction, we were able to determine the order parameters $LFAN@P$+*$/$- 2$/$RTAN and $LFAN@P$+*$/$-4$/$RTAN simultaneously. We found $LFAN@P$+*$/$-2$/$RTAN $EQ 0.466 $POM 0.030 and $LFAN@P$+*$/$- 4$/$RTAN equal to $MIN@0.12 $POM 0.10. !14