Optical response of a hybrid system composed of a quantum dot and a core–shell nanoparticle

Abstract

We study a hybrid system composed of a quantum dot and a core–shell nanoparticle, subject to an external field E0 cos(ωt). We consider the self-interaction of the quantum dot due to the presence of the nanoparticle. We find that the thickness and chemical composition of both core and shell layers influence the borders between Fano, double peaks, weak transition, strong transition, and bistability regions of the phase diagram. Even weak and strong transition regions may almost disappear. The population inversion, the upper and lower limits of intensity where bistability occurs, the absorption, and other features of the system depend on the nanoparticle characteristics. This facilitates the use of the hybrid system as a miniaturized bistable device or a sensor.