Tunability of plasmonic electromagnetically induced transparency from double quantum dot-metal nanoparticle structure under transition momenta

This work studies the tunability of absorbed energy rate (Q(tot)) from a double quantum dot (DQD)-metal nanoparticle (MNP) system under changing the transition momenta of the quantum dot (QD)-QD and wetting layer (WL)-QD. The modeling considers the WL and the orthogonalized plane wave (OPW) for WL-QD transitions, and the study is taken when the plasmonic electromagnetically induced transparency (PEIT) is attained. PEIT was not studied earlier under OPW consideration, which is essential for considering the formulation of the WL-QD system. Also, our modeling is a material property that does not take an averaging of energies and momenta as in the literature. It calculates the QD energy states, QD-QD, and WL-QD transition momenta. It is shown that a slight variation in the QD-QD momentum gives efficient changes in the Q(tot). Reducing the WL-QD valence band momenta is more efficient in Q(tot) reduction while the spectrum exhibits four PEIT windows. Also, controlling the WL-QD conduction band transition gives six PEIT windows. These results are essential in biomedical and quantum computer applications. It is significant and is not obtained with other QD-MNP systems. It results from the flexibility of the DQD-MNP system used here, not found in other systems. One of the WL-QD momenta has an inverted effect on Q(tot). The results in this work show that the transition momenta can tune PEIT, which refers to a high possibility of designing the structure according to the application required.