Superluminal propagation of birefringence modes in surface plasmon polaritons through hybrid metallic nanoparticles and chiral systems

We have theoretically investigated the enhancement of superluminal birefringence modes of surface plasmon polaritons (SPPs) at the interface of a chiral quantum dot (QD) nanostructure and a metallic nanoparticle (MNP) hybrid system. This configuration facilitates the generation of SPP birefringence modes when illuminated by incident light. The resonances of SPPs within the hybrid nanostructure are determined through analytical calculations using Maxwell’s equations under specific boundary conditions. Additionally, we model the dynamics of the chiral quantum dots system using the density matrix approach, considering it as a four-level configuration interacting with weak probe, magnetic, and strong coupling fields. Our findings indicate that electron tunneling strength and the intensity of the control field significantly influence the birefringence modes of superluminal SPPs. Furthermore, the observation of negative group index and advanced time in the birefringence beams of SPPs provides evidence for the enhanced superluminal birefringence modes. This research has substantial implications across diverse areas such as optical information processing, temporal cloaking, quantum communication, and the advancement of computer chip speed.