Enhancement of omnidirectional bandgap in graphene based quasi-periodic one dimensional photonic crystal heterostructures

Abstract

We study the omnidirectional reflection (ODR) in one dimensional photonic crystal (PC) structures consisting of alternate layers of graphene as material of high  refractive index and SiO₂ as material of low  refractive index. The effects of the thickness of layers and incidence angles on the spectral reflectance have been investigated using transfer matrix method (TMM).  The proposed structure gives high reflection within a wide range of wavelengths in the visible and near infrared region and can be used effectively in wavelength filters, optical resonators and mirrors. We also propose here the considerable enhancement of omnidirectional reflection band in near infrared region by changing the design parameters using a gradual constant. Due to considerable control of absorption and small dissipation of electromagnetic energy in graphene, the damping and skin effect in the PC are also obscured.