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

• Published in: New journal of physics Vol. 26; no. 5; pp. 53035 - 53045
• Main Authors: Idrees, Muhammad, Li, Hui-Jun
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01-05-2024
• Subjects: Boundary conditions; chiral; Circular polarization; Data processing; Electron tunneling; Gold; hybrid; Hybrid systems; Incident light; Maxwell's equations; Nanostructure; plasmon; Plasmons; Polaritons; Propagation; Quantum dots; superluminal; Superluminal propagation
• ISSN: 1367-2630; 1367-2630
• DOI: 10.1088/1367-2630/ad44d0

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 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 (LCP) SPPs. 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 SPPs 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.