  The optical response of an artificial hybrid molecule system composed of two
metallic nanoparticles (MNPs) and a semiconductor quantum dot (SQD) is
investigated theoretically due to the plasmon-exciton-plasmon coupling effects
on the absorption properties of the hybrid nanosystem, which depends on the
interaction between the induced dipole moments in the SQD and the MNPs,
respectively. We show that the strong coupling of exciton and localized surface
plasmons in such a hybrid molecules leads to appealing, tunable optical
properties by adjusting the symmetry of the hybrid molecule nanosystem with
controllable interparticle distances. We also address here the influence of the
size of the MNPs and dielectric constant of the background medium on the
optical absorption of the MNPs and SQD, respectively, which results in the
interparticle Foster resonance energy transfer (FRET). Our results will open an
avenue to deal with the surface-enhanced spectroscopies and potential
application of the quantum information.
