Abstract

Pump-probe spectroscopy has proven to be a valuable tool to investigate promising potentials of molecular aggregates for applications as highly nonlinear optical materials As the nonlinearity in J-aggregates becomes dependent on the coherence length (the number of molecules over which the excitation is delocalized), annihilation and amount of disorder in the aggregated chams affects the optical response in a great deal under the strong excitation conditions. Therefore, it is important to figure out how the processes following high intensities (exciton-exciton annihilation and dynamic disordering of the aggregate e.g.) maps onto the time- and excitation-dependent differential absorption spectra (DAS).

© 2000 IEEE