Abstract
A theoretical study of the optical bistable response of a linear molecular aggregate modelled as a linear chain of molecules is carried out, making use of the one-molecule density matrix approach in which the intermolecular dipole-dipole interaction is included explicitly. The effect of exciton-exciton annihilation on the bistable behaviour is analyzed. One point of view seems to be that the annihilation channel of relaxation can destroy the bistability. However, we found that the bistable behaviour may be observable even when the annihilation constant greatly exceeds the intermolecular dipole-dipole interaction being responsible for the aggregate bistability.
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