基于石墨烯Tamm等离子体激元的太赫兹强耦合效应

Strong coupling effect of graphene Tamm Plasmon Polaritons in the terahertz band

摘要:

设计了一种全新的一维石墨烯-光子晶体(PhC)复合谐振结构，使用传输矩阵法(TMM)对其所支持的太赫兹Tamm等离子体激元(TPP)和腔体模式(CM)之间的强耦合效应进行理论研究。研究表明，用于表征耦合强度的Rabi分裂能随着光子晶体周期数的减小而增大；改变间隔层和腔体厚度以及石墨烯的费米能级时，也会影响Rabi分裂能。最后通过入射角度对耦合模式进行主动调控，当入射角处于0°~60°时，耦合模式的特性与偏振无关。本文的研究结果为太赫兹强耦合效应的研究和应用提供了新的思路。

Abstract:

A novel one-dimensional graphene-Photonic Crystal(PhC) composite resonant structure is designed, and the strong coupling effect between the terahertz Tamm Plasmon Polaritons(TPP) and Cavity Modes(CM) supported by the Transmission Matrix Method(TMM) is theoretically studied. It is shown that the Rabi splitting energy employed to characterize the coupling strength increases with the decrease of the number of PhC periods. In addition, when changing the thickness of the spacer layer and the cavity, as well as the Fermi level of graphene, the Rabi splitting energy is also affected. Finally, the coupling mode can also be actively adjusted by changing the angle of incidence. When the angle of incidence is between 0° and 60°, the characteristics of the coupling mode are independent of polarization. This work provides a new idea for the study of strong coupling effect.