Material-Dependencies of the THz Emission from Plasmonic Graphene-Based Photoconductive Antenna Structures

C. Suessmeier, S. Abadal, D. Stock, S. Schaeffer, E. Alarcón, A. K. Wigger, S. E. Hosseininejad, S. Wagner, A. Cabellos-Aparicio, M. C. Lemme and P. Haring Bolívar