  We investigated theoretically the exciton-plasmon coupling effects on the
population dynamics and the absorption properties of a hybrid nanosystem
composed of a metal nanoparticle (MNP) and a V-type three level semiconductor
quantum dot (SQD), which are created by the interaction with the induced dipole
moments in the SQD and the MNP, respectively. Excitons of the SQD and the
plasmons of the MNP in such a hybrid nanosystem could be coupled strongly or
weakly to demonstrate novel properties of the hybrid system. Our results show
that the nonlinear optical response of the hybrid nanosystem can be greatly
enhanced or depressed due to the exciton-plasmon couplings.
