Broadening of Omnidirectional Photonic Band Gap in Graphene Based one Dimensional Photonic Crystals

A simple design of one dimensional gradual stacked photonic crystal has been proposed. This structure exhibits a periodic array of alternate layers of Graphene and Silica. These are the materials of low and high refractive indices respectively. Here the structure considered has three stacks .Each stack has five alternate layers of Graphene and silica. The transfer matrix method has been used for numerical computation. In this paper, such a structure has wider reflection bands in comparison to a conventional dielectric PC structure and structure with Sio2 and Si layers for a constant gradual constant Υ at different incident angle. Keywords—Photonic crystal; Graphene; transfer matrix; gradual costant.