Perfect Absorption in One-Dimensional Photonic Crystal with Graphene-Dielectric Hyperbolic Metamaterials

The absorption characteristics of one-dimensional photonic crystals (1DPC) consisting of an ordinary dielectric and graphene-dielectric hyperbolic metamaterials in terahertz (THz) are theoretically analyzed and numerically simulated using the transfer matrix method. The perfect absorption peaks can be achieved in the structure designed in our research. In the 1DPC, the dielectric layers are embedded into graphene layers and the optical axis of the graphene-dielectric hyperbolic metamaterials is normal to the graphene layers. The graphene-dielectric layers are seen as anisotropic effective medium and possess the properties of hyperbolic dispersion in THz frequency band. The locations of perfect absorptance peaks are dependent on chemical potential, the thicknesses of dielectric layers and the inclined angle. The positions of absorption peaks are blue-shifted with increasing the chemical potential and red-shifted by increasing the thicknesses of the dielectric layers. We testified that the orientation of the optical axis of the graphene-dielectric layers has prominent effect on the locations of the perfect absorption peaks. Moreover, multiband absorption peaks can be obtained by introducing more structure as given in our research with different parameters. The controllable perfect absorption achieved at the far infrared ray (FIR) frequencies could be applied in the design of multichannel perfect absorption filters.