We theoretically investigate the optical response of a hybrid nanocrystal complex composed of a semiconductor quantum dot (SQD) and a metal nanoparticle (MNP) in the presence of laser fields within a full quantum description. The analytic results demonstrate that the modified decay rate of the exciton is related to the exciton energy and the distance between SQD and MNP in terms of a quantum transformation method. The responses of the coupled system to a weak laser field and a strong laser field are demonstrated. When the two laser fields are presented simultaneously, the energy absorption rate of the coupled system to the weak laser field can be controlled by the strong laser field and the distance between SQD and MNP. This tunable optical response in such a hybrid system can be exploited for the development of the optical processing devices such as ultrafast optical switch in the future.
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