Research On Graphene-based Active Optoelectronics Devices

The past few decades have witnessed the increasing development of the Optical Communication System (OCS), and the application of the OCS has also congested in people’s daily lives. One thing that matters is that the properties of the various kinds of the optical components are of vital importance to the future development of the OCS. However, the merits of the current components existed are undesirable in some aspects, such as the large footprint, limited bandwidth, low speed, which will restrict the development of OCS in the near future. To address these problems, in this paper, the novel2D material graphene and conventional optoelectronic devices is combined together to improve the merits of the optoelectronic devices by resorting to the extraordinary properties of graphene.The electro-optical property of graphene is firstly analyzed in this paper, and then a novel graphene-based silicon waveguide is proposed. The novel proposed waveguide is combined together to design several kinds of new graphene-based optoelectronic devices, including Mach-Zehnder graphene-based modulator, ring resonator modulator based on graphene, graphene-based TE/TM polarizer. The main contributions and creativeness in this paper are as following:(1) The graphene-embedded silicon waveguide is proposed, and its property is calculated by both the analytical method and numerical method. The large variation of the real part of effective mode index for the novel waveguide is firstly proposed. The combination of the graphene-based waveguide and Mach-Zehnder modulator has reduced the size of the Mach-Zehnder modulator greatly, resolving the problem of the large footprint of the conventional devices.(2) The property of the ring resonator modulator is analyzed elaborately in theory. The combination of the graphene and conventional ring resonator improves the working bandwidth of the ring resonator modulator, and enables this novel device to working under a large temperature drift of27K.(3) The conventional optical polarizers could only work under one incident polarized light, and the graphene coated waveguide is proposed to address this problem. By resorting to the gate-controllable property of graphene, a tunable polarizer independent with the polarization of the incident light is realized.