Thickness dependent optical properties of multilayer BN/Graphene/BN

摘要

Using the DFT-D2 van der Waals density functional theory method, we have investigated thickness dependent optical properties for polarized light in multilayer BN/graphene/BN structures by changing the stacking order. It has been found that the optical properties of multilayers are strongly subjective to the polarization of the light, whereas no meaningful dependence of the thickness and stacking order is observed. At infrared frequency, a high refractive index is found in parallel polarization and it is suppressed by increasing the frequency, while it is almost constant for perpendicular polarization. A huge reflectivity is also achieved at infrared frequency in 3 and 4 monolayer (ML) films for parallel polarization, whereas it becomes almost constant in perpendicular polarization. In addition, the frequency dependent optical conductivity is found in parallel polarization, but it vanishes for perpendicular polarization.