Advanced graphene metamaterial design for high-efficiency terahertz wave absorption

Abstract

Graphene is extensively used in photonic devices due to its various unique and extraordinary characteristics that are not familiar in conventional materials, especially its high electron mobility, ultra-thin width, functionality of integration, and excellent conductivity. In present investigation, we demonstrated a patterned graphene-based terahertz (THz) metamaterial absorber with combination of different materials, gold, silicon, stacked graphene, polymethyl methacrylate and strip patterned graphene layers, all differentiated by insulating dielectric layer. According to simulation results, this THz broadband absorber demonstrated polarization, electromagnetic field interaction, angle insensitive properties and almost perfect broadband absorption. The base of a structure is composition of various materials stacking on one another. The proposed absorber described more than 95 % absorption from 3.0 to 10 THz, 98.5 % maximum absorption at 7.1 THz and 97.6 % average absorption for 7.0 THz bandwidth. The structure has a decent bearing angle in a wide range of 0°–70° and has angle insensitive s- and p-polarization. Additionally, by modifying the layers and geometrical parameters, the absorption properties can be refined. This suggested absorber can be used in optoelectronic devices, photodetectors, and photosensors based on aforementioned findings.