Study On The Optical Transmission And Regulation Of Graphene And Dielectric Micro-nano Materials

The function of traditional photonic devices is restricted in the development of integrated circuits.So researchers focus on how to make smaller and more integrated electronic components in recent years.In this paper,numerical simulation of Finite Difference Time Domain method(FDTD)is used to study the optical transmission phenomena and internal physical mechanism of micro-nano materials;methods and control methods of optical properties are discussed;and we obtained some interesting optical phenomena such as Electromagnetically-induced transparency and Optical bistability.Through the study of these phenomena,some corresponding controlling way,which provides some theoretical guidance for the new design of high efficiency optoelectronic devices,has been found.The main contents of this thesis are as follows:1)Tuning and mechanism of single and multiple transparency windows of bilayer graphene nanoribbons are studied.Transmission spectra of a series of graphene nanoribbon layers with different widths are studied.It is found that placement,number and size of transparency peaks can be influenced by the graphene ribbons width.Additionally,multiple EIT-like spectral responses can be obtained by adding more unit cells of graphene ribbons in the plasmonic structure.Our results suggest that the demonstrated EIT-like based on graphene plasmonic may offer possibilities for light exchange.2)The optical bistability of the MIM waveguide structure based on the micro-nano metal-Kerr medium is discussed.A clear optical bistable loop is obtained in the study.In addition,it is found that red-shift and blue-shift of the resonant wavelength can be caused by increasing the coupling distance between the waveguide and the nanometer cavity,changing the thickness of the Kerr medium,and changing the height of the equilateral triangle cavity and the refractive index of the waveguide.The results can be applied in highly integrated optical circuits.3)The anomalous optical reflection of the ring-shaped nanorod array is analyzed.The results show that the resonant frequency can be tuned by changing the geometrical parameters of the annular medium nanorods,such as the outer radius,inner radius and incident angle of the ring nanorod array,which can provide a new way to adjust the design of the new optical device.