Graphene’s Absorption Controlling in Nanoplasmonic Structure by Using Antireflection Layer

Graphene has many applications in optical instruments in infrared region. In this article, we have designed a system that increase the graphene absorption up to 8.5 times greater than suspended graphene, by surface plasmon generation in graphene-gold grating boundry and set antireflection layer with different materials on the gold grating. Also the effect of antireflection layer’s thickness on the wavelength is studied in graphene’s absorption spectra specially plasmonic peak. By considering various antireflection layers with different thickness, the absorption of graphene can be enhanced in a wide range of infrared region.