Abstract

We propose a topological beam-shaping strategy of terahertz (THz) beams using geometric phase elements made of space-variant birefringent slabs. Quasi-monochromatic THz vortex beams are produced and characterized both in amplitude and phase from the reconstructed real-time two-dimensional imaging of the electric field. Nonseparable superpositions of such vortex beams are also obtained and characterized by two-dimensional polarimetric analysis. These results emphasize the versatility of the spin-orbit electromagnetic toolbox to prepare on-demand structured light endowed with polarization-controlled orbital angular momentum content in the THz domain, which should find many uses in future THz technologies.

© 2016 Optical Society of America

Terahertz vortex beam generation by infrared vector beam rectification

Ali Al Dhaybi, Jérôme Degert, Etienne Brasselet, Emmanuel Abraham, and Eric Freysz
J. Opt. Soc. Am. B 36(1) 12-18 (2019)

Generation of broadband terahertz vortex beams

Ryo Imai, Natsuki Kanda, Takuya Higuchi, Kuniaki Konishi, and Makoto Kuwata-Gonokami
Opt. Lett. 39(13) 3714-3717 (2014)

Generation of perfect vectorial vortex beams

Peng Li, Yi Zhang, Sheng Liu, Chaojie Ma, Lei Han, Huachao Cheng, and Jianlin Zhao
Opt. Lett. 41(10) 2205-2208 (2016)

Generation of Airy vortex and Airy vector beams based on the modulation of dynamic and geometric phases

Junxiao Zhou, Yachao Liu, Yougang Ke, Hailu Luo, and Shuangchun Wen
Opt. Lett. 40(13) 3193-3196 (2015)

Plasmonic fork-shaped hologram for vortex-beam generation and separation

Airong Zhao, Aline Pham, and Aurélien Drezet
Opt. Lett. 46(3) 689-692 (2021)