We propose a novel type of bowtie terahertz antenna based on hyperbolic metamaterials that are composed of multilayers of Indium Antimonide (InSb) and SiO2. The InSb-SiO2 multilayers have hyperbolic dispersion at terahertz frequency range. Compared with the conventional bowtie antenna composed of gold, fully-vectorial simulations show that, the localized field enhancement in the proposed structure is 16 times of that for the gold antenna. We further reveal that this great field enhancement attributes to the significantly enhanced out-of-plane electric field component in the hyperbolic metamaterial antenna. We expect this work will find applications in terahertz sensors, detectors, and nonlinear devices.
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