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Advances in Condensed Matter Physics
Volume 2017 (2017), Article ID 1569621, 8 pages
https://doi.org/10.1155/2017/1569621
Research Article

Enhanced Group Delay of the Pulse Reflection with Graphene Surface Plasmon via Modified Otto Configuration

1School of Computer and Information Engineering, Hunan University of Commerce, Changsha 410205, China
2College of Physics and Information Science, Hunan Normal University, Changsha 410081, China

Correspondence should be addressed to Leyong Jiang; nc.ude.unnuh@82ylgnaij

Received 28 June 2017; Accepted 30 August 2017; Published 1 November 2017

Academic Editor: Yan Luo

Copyright © 2017 Guimei Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this paper, the group delay of the transverse magnetic (TM) polarized wave reflected from a modified Otto configuration with graphene surface plasmon is investigated theoretically. The findings show that the optical group delay in this structure can be enhanced negatively and can be switched from negative to positive due to the excitation of surface plasmon by graphene. It is clear that the negative group delay can be actively tuned through the Fermi energy of the graphene. Furthermore, the delay properties can also be manipulated by changing either the relaxation time of graphene or the distance between the coupling prism and the graphene. These tunable delay characteristics are promising for fabricating grapheme-based optical delay devices and other applications in the terahertz regime.