ABSTRACT
We have studied the optical properties of asymmetry one-dimensional photonic crystal (1D PC) with liquid crystal (LC) defect, where LC, an electro-optic material, is embedded with graphene layers, by considering the orientation of LC molecules under the influence of the electromagnetic wave. The optical property of the LCs changes and plays very important role in many optical devices due to the orientation of molecules. The 1D PC with LC defect is used as bi-stable devices. However, graphene is a 2D material and has excellent electronic and optical properties as well. Hence, it is used in many optical devices to enhance their optical properties. In our study, we consider the graphene layer asymmetry 1D PC with embedded LC as the defect where the graphene layer is stuck to one end of the asymmetry finite 1D PC. The transmittance of the graphene layer asymmetry 1D PC with defect LC has obtained the defect peaks, which have high absorption behavior due to the metallic behavior of the graphene. The absorption peaks of the asymmetry 1D PC containing the defect of LC with embedded graphene layers can be tuned by the orientation of LC molecules. The tunability of the considered structure can be achieved by varying the gate voltage of graphene and director angle of the LC. We have suggested a sensor that is based on the embedded LC as the defect with graphene layers in the asymmetry 1D PC by calculating peak wavelength in the photonic bandgap (PBG) region of the 1D PC.
