Effect of the asymmetry of plasmonic multi-shell nanoparticles on the optical response of semiconductor quantum dot-nonconcentric nanoshell hybrid systems

In this study, the plasmon-exciton interaction in a hybrid system comprising a semiconductor quantum dot (SQD) coupled to a spherical multilayer metallic nanoshell (MNS) with symmetry breaking is theoretically and numerically investigated within the density matrix framework. It is shown that the presence of an asymmetric MNS can strongly affect the optical response of the SQD-MNS system. The effect of the geometrical symmetry breaking of MNS induced by offsetting the core or shell on the optical absorption of the system is demonstrated and discussed. Since asymmetric plasmonic nanoshells with an additional degree of freedom introduce unique and tunable optical properties compared to symmetric nanoshells, we study the linear optical susceptibility of the proposed hybrid molecule interacting with a linearly polarized laser field. The key feature of these nanoscale hybrid structures is their ability to tune and control the optical absorption spectrum, which is crucial for many practical applications.