Graphite based metamaterial for high frequency applications

•The simulation of ne plan of cylindrical natural graphite.•Response of simulation of two and tree plan of graphite with different geometrical parameters.•Simulation of spherical structure of grain of graphite.•Simulation of ordered H-shape structure with two plans of grain of graphite.•Simulation of random structure of grain of graphite.•The obtained irregular structure has been shown to enhance the frequency response of the material allowing resonant values higher than 800 THz. Simulation results of graphite based metamaterial structures are presented. The numerical simulation was used to model the material and calculate the optical responses of the designed structures. Different geometries and spatial arrangements were considered for the unit cell. The results showed that the designed graphite behaves as a metamaterial resonant cavity and the grain structure strongly influences the frequency response of the metamaterial. Moreover, higher frequencies are reached by the random distributions of the grains. Resonant frequency values as high as 800 THz are obtained.