Graphene—A Promising Material for Realizing Active and Passive Terahertz Radiators

The potentiality of graphene as a base substance of the terahertz (THz) sources has been explored in this chapter. The graphene can be used as the base substances of both active as well as passive THz radiators. In the passive THz radiator category, different graphene-based THz antennas have been discussed. On the other hand, graphene-based laser and avalanche transit time (ATT) THz sources have been reviewed under the active THz radiator category.