Energy absorbed from double quantum dot-metal nanoparticle hybrid system

Abstract

This work proposes the double quantum dot (DQD)-metal nanoparticle (MNP) hybrid system for a high energy absorption rate. The structure is modeled using density matrix equations that consider the interaction between excitons and surface plasmons. The wetting layer (WL)-DQD transitions are considered, and the orthogonalized plane wave (OPW) between these transitions is considered. The DQD energy states and momentum calculations with OPW are the figure of merit recognizing this DQD-MNP work. The results show that at the high pump and probe application, the total absorption rate ({Q}_{tot}) of the DQD-MNP hybrid system is increased by reducing the distance between DQD-MNP. The high {Q}_{tot} obtained may relate to two reasons: first, the WL washes out modes other than the condensated main mode. Second, the high flexibility of manipulating DQD states compared to QD states results in more optical properties for DQD. The {Q}_{DQD} is increased at a small MNP radius on the contrary to the {Q}_{MNP} which is increased at a wider MNP radius. Under high tunneling, a broader blue shift in the {Q}_{tot} due to the destructive interference between fields is seen and the synchronization between {Q}_{MNP} and {Q}_{DQD} is destroyed. {Q}_{tot} for the DQD-MNP is increased by six orders while {Q}_{DQD} is by eight orders compared to the single QD-MNP hybrid system. The high absorption rate of the DQD-MNP hybrid system comes from the transition possibilities and flexibility of choosing the transitions in the DQD system, which strengthens the transitions and increases the linear and nonlinear optical properties. This will make the DQD-MNP hybrid systems preferable to QD-MNP systems.