Electromagnetic properties of graphene metasurfaces and applications

Periodic perturbation of natural materials to engineer their properties is a versatile technique to design novel devices in the field of electromagnetics. Graphene, the ultimate two dimensional material, was recently successfully fabricated in large areas and is thus available for engineers to devise new structures based on its exceptional properties. In this context, here we investigate the effect of periodic patterning on the graphene properties and its applications for different functionalities and frequencies. Several graphene metasurfaces are presented, thereby demonstrating that such ultrathin surfaces can be used to dynamically control the electromagnetic wave reflection, absorption, or polarization. To demonstrate the applicability of the concept at different frequency ranges, the examples provided range from microwave to infrared, corresponding to graphene features with length-scales of a few millimeters down to about a micrometer, respectively. The results are obtained using a full-vector semi-analytical numerical technique based on periodic Method of Moment (PMoM) developed to accurately model the graphene-based multilayer periodic structures under study.