Graphene materials for terahertz technology with broadband impedance matching effect

摘要

The potential of graphene and reduced graphene oxide (rGO) films as wave impedance matching layers has been examined in a broad terahertz (THz) spectral bandwidth. The THz sheet conductivities of these films measured by THz time-domain spectroscopy were observed to be tunable and sensitive to layer numbers, thicknesses, and doping concentration, which can be efficiently controlled by physical and chemical methods. Remarkable broadband impedance matching was achieved with graphene and rGO films. The underlying mechanisms have been revealed in both experiment and theory. This work paves the way for developing graphene materials for broadband and large-scale anti-reflection layers for THz components.