Investigation And Application Of Graphene- Medium Composite Structure

Since graphene was successfully made, it has aroused global attention for its outstanding properties. Numerous graphene based nanoelectronic and nanophotonic devices emerged, showing great potential of graphene for applications. This paper analyzed propagation characteristics of electromagnetic wave in graphene-medium composite structure, using generalized spectral domain-exponential matrix technique, mainly transmittance and reflectance. And on the basis, we tried to introduce such composite structure into several devices. We simulated parallel-plate waveguide, terahertz switch and power divider. The main academic contributions of this dissertation include:1. A brief introduction of the band structure of graphene and an explanation of microscopic theory of its outstanding properties. Then, we introduced two graphene conductivity models. One is graphene conductivity model in optical band and the other is multilayer graphene illuminated by an external optical excitation conductivity model in THz band. Next, we explained the equivalent circuit model of graphene and generalized spectral domain-exponential matrix technique, in order to pave the way for the following calculation.2. A detailed comparison of equivalent circuit model, transfer matrix technique and generalized spectral domain-exponential matrix technique. Finally we chose generalized spectral domain-exponential matrix technique as the computing method of this paper. Then we analyzed propagation characteristics of electromagnetic wave in graphene-axially helicoidal (bi)anisotropic film structure and multilayer graphene-ferroelectric film structure, then explained the influence of graphene, respectively.3. On the basis of previous research, we applied multilayer graphene-ferroelectric film structure into one parallel-plate waveguide and carefully discussed phase and attenuation constant of guided TM mode. Meanwhile, we simulated graphene-medium composite structure based switch and power divider operating at THz band. Through adjusting chemical potential of graphene, we could efficiently control the "ON" and "OFF" of switch and choose the branch port of power divider. This paper aims to provide theoretical reference for the industrial design and manufacturing of nanoelectronic and nanophotonic devices through simulation.