Energy absorbed from double quantum dot-metal nanoparticle hybrid system

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 (Qtot) of the DQD-MNP hybrid system is increased by reducing the distance between DQD-MNP. The high Qtot 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 QDQD is increased at a small MNP radius on the contrary to the QMNP which is increased at a wider MNP radius. Under high tunneling, a broader blue shift in the Qtot due to the destructive interference between fields is seen and the synchronization between QMNP and QDQD is destroyed. Qtot for the DQD-MNP is increased by six orders while QDQD 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.

Automated summary

This work proposes a hybrid system of double quantum dots and metal nanoparticles for achieving a high energy absorption rate. The structure is modeled using density matrix equations that take into account the interaction between excitons and surface plasmons. Results show that reducing the distance between the quantum dots and metal nanoparticles increases the total absorption rate of the hybrid system.