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Opt Express. 2008 Nov 10;16(23):18895-909.

Linear to radial polarization conversion in the THz domain using a passive system.

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  • 1Institut FEMTO-ST, Université de Franche-Comté, UMR 6174 CNRS, Département d'Optique P.M. Duffieux, Besançon cedex, France.


This paper addresses a passive system capable of converting a linearly polarized THz beam into a radially polarized one. This is obtained by extending to THz frequencies and waveguides an already proven concept based on mode selection in optical fibers. The approach is validated at 0.1 THz owing to the realization of a prototype involving a circular waveguide and two tapers that exhibits a radially polarized beam at its output. By a simple homothetic size reduction, the system can be easily adapted to higher THz frequencies.

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