An optical vortex [1] carries an annular intensity profile and an orbital angular momentum, characterized by a topological charge ℓ, owing to its helical wavefront, and it provides us a variety of potential research opportunities, including chiral fabrications [2-4], high-speed communications and scanning microscopes with a spatial resolution beyond the diffraction limit. The above-mentioned applications require strongly frequency versatility of the vortex light sources, thus, a THz vortex source will offer entirely new fundamental sciences and advanced technologies for THz photonics.

© 2019 Japan Society of Applied Physics, The Optical Society (OSA)

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