Abstract

We report on the conversion of an infrared vector beam into terahertz vortex beams using a $⟨110⟩$-cut ZnTe cubic crystal. First, we provide a theoretical analysis demonstrating how an infrared vector beam with the azimuthal order $\ell$ can be transformed into a terahertz beam endowed with an orbital angular moment content that consists of optical vortices with topological charge $\pm 2\ell$. Experimentally, quasi-monochromatic terahertz vortex beams with topological charges $+2$ and $-2$ are produced and characterized both in amplitude and phase using real-time two-dimensional imaging of the terahertz electric field. These results enrich the terahertz vortex beam toolbox via the transfer of topological information from the infrared to terahertz domains.

© 2018 Optical Society of America

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