Design of Efficient Photomixer-based Terahertz Dielectric Resonator Antenna

A dipole-fed photomixer based THz dielectric resonator antenna (DRA) has been truncated from an electrically Gallium Arsenide (GaAs) substrate. The photomixer is supported by a low temperature GaAs substrate with two dimensional photonic crystal (2D-PhC) and optical superstrate that maximize the optical power absorption. As a result, the optical-to-THz power conversion has been improved by a factor of 256. Additionally, a THz dielectric superstrate has been employed above the DRA, which results in an overall antenna gain of 10dRi and an input resistance of 436 Omega. Consequently, the radiated THz power from the proposed DRA has improved substantially due to the improved opticalto-THz power conversion and enhanced matching and radiation efficiencies.