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 10dBi and an input resistance of $436 \Omega$. Consequently, the radiated THz power from the proposed DRA has improved substantially due to the improved optical-to-THz power conversion and enhanced matching and radiation efficiencies.