TIME-RESOLVED 3RD-ORDER NONLINEAR-OPTICAL SUSCEPTIBILITY OF LANGMUIR-BLODGETT-FILMS OF MIXED DIMERS ZNP(N-C22)4 H2PCTS4- BY FEMTOSECOND LASER SPECTROSCOPY/
We report the first study of time-resolved third-order non-linear opti
cal susceptibilities X(3) of Langmuir-Blodgett (LB) films formed with
ZnP(N+C22)4/H2PcTS4-. Chi(3) of LB films was investigated by non-degen
erate four-wave mixing techniques with femtosecond time resolution. Th
e LB film was excited at 620 nm and probed at 650 nm. This porphyrin-p
hthalocyanine mixed dimer has a chi(3) with three temporal components
related to three excited state populations.