Abstract
Light propagation effects on nonlinear optical response of a size-controlled GaAs thin film at exciton resonance are investigated by transient gradient using picosecond pulses (1.5 ps). The signals are enhanced at the exciton resonance and the temporal profiles strongly depend on the excitation pulse energies. The result indicates that the nonlinear response is induced by excitonic polaritons and its decay is determined by the round-trip of the polariton in the film.
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