Graphene Enhanced 2-D Nanoelectrode for Continuous Wave Terahertz Photomixers

New enhanced type photomixers for continuous wave (CW) terahertz (THz) generation were fabricated using 3-5 layers and 6-8 layers of graphene material. These multilayer graphene (MLG) sheets were used as 2-D nanoelectrodes on low-temperature-grown (LTG) GaAs photoconductor. The MLG nanoelectrode shows unique properties with high short-circuit current capabilities and reliable high photocurrents. Furthermore, due to the transparency of the MLG, the use of these graphene 2-D nanoelectrodes in THz photomixers allows an efficient optical power illumination for high photocurrent generation and shows a reliable CW THz emission.