Demonstration of a High-Efficiency Reflectarray Antenna at 1 THz Based on Dielectric Resonators

A reflectarray antenna composed of more than 87000 single-crystal silicon resonators on a gold ground plane is experimentally demonstrated to achieve efficient beam focusing at 1 THz. The functionality of the reflectarray as a collimator is also verified by the principle of antenna reciprocity. Because of the low-loss and nondispersive nature of high-resistivity silicon in the submillimeter regime, the losses of the reflectarray are negligible, a very desirable feature at such frequencies. Reflectarrays based on dielectric resonator antennas (DRA) have been relatively unexplored in the terahertz range, mainly because of the challenging fabrication process.