2D materials such as graphene, a planar sheet of carbon molecules arranged in a honeycomb lattice, exhibit interesting properties that open new applications in electronics and optoelectronics. Probing the electronic structure and properties of these materials is challenging due to their reduced thickness (for some only one atom). The authors of this Optics Express article demonstrate efficient measurement of the conductivity in graphene by the combined use of terahertz time-domain spectroscopy and a simple parallel plate waveguide. Key to this process is the exponential increase of absorption with the length of the waveguide, rendering the absorption by a single layer of atom detectable even with a carrier density as low as 2x1011
You must log in
to add comments.