Geometric phase shaping of terahertz vortex beams

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...

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Bibliographic Details
Published in:Optics letters 2017-01, Vol.42 (1), p.41-44
Main Authors: Minasyan, Amalya, Trovato, Clément, Degert, Jérôme, Freysz, Eric, Brasselet, Etienne, Abraham, Emmanuel
Format: Article
Language:English
Subjects:
Angular momentum
Beams (radiation)
Electron beams
Optics
Physics
Polarimetry
Real time
Slabs
Strategy
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Summary: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.42.000041