Modeling of plasmonic terahertz antennas using COMSOL® multiphysics

A computational model allowing for the study of terahertz photoconductive antennas is presented. This model allows for nanoscale geometry variations in three dimensions. The model is validated using measurements data. The preliminary results illustrate the effectiveness of the model in calculating the time-dependent photocurrent collected by the antenna as well as the total photocurrent enhancement of the terahertz antenna as compared to the non-plasmonic design. This model will be used as a tool to design a more enhanced plasmonic terahertz photoconductive antenna as will be presented in the conference.