The Effect of the Core on the Absorption in a Hybrid Semiconductor Quantum Dot—Metal Nanoshell System

We examine the optical absorption in a hybrid structure composed of metal nanoshell and semiconductor quantum dot, while interacting with linearly polarized probe electromagnetic field. First, we derive equations motion, rotating wave approximation. Then procced to derivation analytical expressions for linear susceptibility dot. The imaginary part expresses coefficient. find that by properly engineering thickness nanoshell, material dielectric core interparticle distance, may achieve an optimum response. identify emergence two distinct types exciton states. One them emerges strong exciton–plasmon coupling regime low values constant radius core. This type exhibits amplified gain without population inversion quenched resonance accompanied suppressed lifetime. second weak presents opposite spectral characteristics. Here, lifetime substantial increase, especially small distances, which case dot are strongly coupled one another.