Analytical study of highly adjustable plasmonic modes in graphene-based heterostructure for THz applications

This paper aims to study the reflection charac-teristics of optical beams in a hybrid graphene-hexagonal boron nitride (hBN)-graphene structure, which has been located on SiO2-Si layers. An analytical model is presented to derive the reflection characteristics by using the trans-fer matrix method. The upper Reststrahlen band has been chosen as the studied frequency range. It is shown that the characteristics of the reflected beam can be effectively con-trolled by varying the chemical potential of graphene sheets. The obtained results represent a high value of the reflected group delay (tau(r) = 15.3ps) at the frequency of 24.9 THz. The presented investigation will be helpful to control the group delays of reflected beams and can be utilized for the design of innovative graphene-hBN devices in the mid-infrared wavelengths.