Pump−Probe Simulation Study of the Two-Exciton Manifold of Dendrimers

The doorway window representation of sequential four wave mixing combined with the nonlinear exciton equations (NEE) is used to calculate femtosecond pump probe spectra of the dendrimeric nanostar. Direct signatures of exciton funneling and the two-exciton states are identified. The frequency-domain pump−probe signal is computed as well, showing the effects of exciton coupling and excited-state absorption. Further information obtained from different polarization configurations of the pulses with respect to the molecular orientation is discussed.