Superluminal propagation of surface plasmon polaritons via hybrid chiral quantum dots system

Abstract

We present a novel methodology for enhancing superluminal surface plasmon polaritons (SPPs) propagations within a hybrid nanostructure configuration consisting of gold (Au) metal and chiral quantum dots (CQDs) medium. The arrangement of CQDs and metal hybrid nanostructures enables the production of surface plasmon polaritons (SPPs) when exposed to incident light. The
resonances of SPPs within a hybrid nanostructure are determined through analytical calculations using Maxwell's equations under
specified boundary conditions, while the dynamics of the CQDs system are calculated using the density matrix approach. It is
demonstrated that the propagation of SPPs is significantly influenced by both right-circularly polarized (RCP) and
left-circularly polarized surface plasmon polaritons. Additionally, we investigate the enhancement of superluminal SPPs
propagation by varying the electron tunneling strength and the intensity of the control field within the hybrid system. The
characteristics of RCP and LCP surface plasmon polaritons have been investigated, indicating a large negative group index and
advancement in time. The observation of a large negative group index and advancement in time provides strong evidence for
enhanced superluminal SPPs propagation within the proposed hybrid nanostructure. The results have potential applications in the
fields of optical information processing, temporal cloaking, quantum communication, and the advancement of computer chip speed.