Defect mode tunability based on the electro-optical characteristics of the one-dimensional graphene photonic crystals

Research Abstract

Conclusion: In summary, we have investigated the reflectance characteristics of 1D defective PCs in the case of TE mode of polarization. The current study is concerned with specified wavelengths of the incident electromagnetic waves that expended from 0.7 μm to 1.6 μm. Here, the defect layer is designed according to four different configurations named LN, Polystyrene, G / LN, and G / Polystyrene. The numerical results are investigated based on the theoretical treatments of the electro-optic effect and the transfer matrix method. The investigated results show that, graphene provide the ability to enhance the intensities of both LN and Polystyrene defect layer.In the presence of graphene with Lithium Niobate, the intensity of the defect mode increased by 5 % beside the shift in its position with 41 nm. For the case of polystyrene, the intensity of the defect mode increased from 6.5 to 68.8 % and its position is shifted with 72 nm. This effect reflects the role of the graphene sheet in the enhancement of the defect layer intensity.The tuning of the resonant modes was also studied by taking into account the dependence of the optical characteristics on the thickness of the defect layer, the applied electric field and the angle of the wave incident of the crystals.Moreover, the deposition of graphene sheets inside the two faces of the defect layer could increase the intensity of the defect mode up to 94 % especially for the case of polystyrene. Hence, polystyrene with deposited sheets of graphene could be of interest in many photonic applications. So it is reasonable to conclude that the proposed structures have a great potential in the fabrication of tunable optical filters and sensing of electric field as well.

Research Keywords

graphene-photonic crystal-Electro optical material-TMM