Diffraction Enhanced Transparency in a Hybrid Gold-Graphene THz Metasurface

摘要

Diffraction enhanced transparency (DET) is a phenomenon based on interference in periodic lattices of resonators, leading to sharp transmission peaks where the associated anomalous dispersion can be used to delay THz radiation traversing the lattice. In this contribution we use an atomically thin graphene layer to strongly suppress DET altering the THz propagation. The response of this system is investigated both in the far- and near-field, where the suppression of DET can be measured both in the spectral response of the sample and in the changing near-field distributions surrounding the resonators. Changing the properties of the graphene layer allows for control over the transparency window, which is relevant for active THz devices.