Plasmonic Hybrid Nanoelectrodes Structure based on Graphene and Silver Nanowire for CW-THz photomixer devices

Terahertz (THz) photomixer devices are becoming attractive components for coherent optoelectronic THz systems due to their ability to operate as THz emitters and receivers. Enhanced THz photomixer emitters based on graphene flakes and silver nanowires nanoelectrodes overcome the performance of classical interdigitated photomixers with metal electrodes. Here, we performed a simulation of the hybrid nanoelectrodes structure based on an array of graphene flakes and silver nanowires (AgNWs) to comprehend the plasmonic motion of the generated carriers in the active area of the device. The simulation results show that the conductivity of Ag-NWs was improved by the conductivity of graphene flakes. Where the graphene flakes create a spatial electric field close to their edges. Due to the confined electric field, the carriers will be transported between graphene flakes and Ag-NWs by a spatial plasmonic field, and subsequently making the graphene flakes act as connected rather than isolated. Therefore, graphene and Ag-NWs allow simultaneous carrier transport in the hybrid nanostructure.