Surface plasmon polaritons at an interface between silver and quantum dots hybrid nanocomposite

Abstract

Surface plasmon polaritons (SPPs) are investigated theoretically at the interface between silver metal and a hybrid system containing silver metal nanoparticles (MNPs) and semiconductor triple quantum dot (STQD). Various properties of SPPs are studied by varying the distance between silver MNP and SQD, radii of the MNP in the hybrid medium, and gate voltage applied to the TQD. A remarkable modification up to 315 μm is obtained in the SPPs’ propagation length by considering different sizes of silver MNPs in the hybrid medium. The wavelength of the SPPs is controlled via changing the distance between the MNPs and TQD, and gate voltages applied to TQD in the hybrid medium. Furthermore, we have studied the effect of various parameters such as gate voltages and radii of the MNPs on the penetration depth of SPPs into both sides of the interface of silver metal and hybrid medium. Plasmonic regions consisting of hybrid medium and silver metal provide multiple dimensions for the generation and control of SPPs. Therefore, it is assumed that these findings may have important applications in bio-sensors, atomic spectroscopy, photovoltaic devices, surface-enhanced Raman spectroscopy, solar cells, and plasmon technology.