Polarizing Anisotropic Three-Dimensional Dirac Semimetal Metamaterial Antennas for Terahertz Telecommunication Applications

Three-dimensional Dirac semimetals have shown interesting optical properties, such as excellent response to the Terahertz frequencies, optical anisotropy, and large nonlinear optical coefficients. In this work, the unique optical properties of three-dimensional Dirac semimetals have been exploited in the design and construction of Terahertz polarizing metamaterial antennas. Antenna arrays consisting of elements of different shapes and sizes were designed, and it is found that the square-shaped element gives the best polarizing performance across a wide bandwidth. The nonlinear polarization switching property of a circular-shaped three-dimensional Dirac semimetal antenna array is also briefly studied, with results that show good sensitivity at moderate pump intensities.