A Research Of Structure And Properties Of Electro-Optical Modulator Based On Graphene

Graphene is a single- or few-layered sheet of Sp~2-bonded carbon atoms. It can be produced by either top-down methods such as the mechanical scotch tape method and chemical exfoliation from graphite or bottom-up method such as chemical vapor deposition. The unique physical and chemical properties of this 2D nanomaterial have interested people from various fields. The most intriguing property of graphene is its remarkably high electron mobility and its size-dependent electrical properties, making it a promising material in high-performance electronic devices.This paper first expounds on the development of graphene modulator, through analysis of the research achievements of predecessors, mastered the base of the basic principles of graphene modulator. By analyzing the basic principles of Mach-Zenhder modulator, we know that the unique band structure, optical and electrical properties of graphene make it have good light penetration and large effective refractive index change. So it can be applied to the construction of the Mach- Zenhder modulator.And then, through the analysis of the previous research results of waveguide materials at home and abroad, in order to further improve the work efficiency of the graphene layer, we devise a symmetrical graphene waveguide structure. After analysising and researching on the characteristic parameters such as the absorption loss and effective refractive index change of the graphene waveguide, we optimize this graphene waveguide structure, and finally get a waveguide structure of three layers of graphene.At last, this paper analyzes the influence factor of the performance parameters of the Mach-Zenhder modulator, such as the distance between two arms, Y branch Angle and length of transition zone. Through calculating and analysising extinction ratio, modulation bandwidth and insertion loss of the Mach-Zenhder modulator, we optimize the structure of the modulator, and finally devise a non symmetrical Mach-Zenhder modulator.This paper mainly studies the model of optical waveguide based on graphene, and we simulate the properties of the waveguide through Comsol software. After researching the properties of the Mach-Zehnder interferometric modulator based on graphene optical waveguide, we designed a new kind of graphene modulator, optimize its structure, and finally calculate its parameters.