Near-field imaging of magnetic resonance in terahertz dielectric resonator antennas

Abstract

One major hurdle for antennas created from metallic resonators is their low radiation efficiencies due to increasing Ohmic loss at terahertz frequencies. A potential solution to overcome this is to substitute metal with dielectric materials in designing resonators. Dielectric resonator antennas (DRAs) resonate based on the confinement of displacement current, at specific resonance frequencies. Hence, the Ohmic loss is mitigated in DRAs. An array of silicon resonators on quartz is realized to examine their magnetic resonance at 0.625 THz. This work employs a terahertz near-field imaging technique to measure the complex electric near-fields of this DRA array.