Research On The Optical Properties Of Graphene-Based Nanoantenna

With the advent of the era of big data, microelectronics has exceeded Moore’s Law into the nanometer era, needs for the further development of nanophotonics and other fields to meet the needs of the rapid development of information technology. But along with the device by the limit of the diffraction limit, the size and processing of the nanophotonic devices are only at micron level resolution. Because of the special optical characteristics of the surface plasmon, it is possible to realize nano-sized optics and achieve nanoscale manipulation, the surface plasmon can break the diffraction limit, and be applied to the field of information processing, etc., graphene-based surface plasmon has stronger electromagnetic constraints ability and lower loss characteristics, the design of graphene-based nanoantennas and other nanoscale optical devices have a significant research progress.This paper analyzes the conductivity and dielectric constant of graphene with changes in light frequency, the Fermi level, temperature and other parameters. The optical properties of optical antennas based on ring structure and bowtie structure have been studied using the finite element method, The studies of two different structures of nanoantennas surface plasmon resonance characteristics by changing the distribution of the electrical conductivity of graphene have been achieved, indicating resonant characteristics of nanoantennas can be tuned not only by changing the size of geometry of dielectric constant of the substrate, but also by changing the doping level of graphene to adjust the electrical conductivity, In addition, graphene-based nanoantennas plasma mode with strong local field enhancement can reach103orders of magnitude, which has potential applications in the areas of sensing and spectroscopy, etc. In this thesis, the conductivity of graphene changes can be manipulated to change optical properties of nanoantennas, which has a reference value in the further study and practical design of optical antennas.