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Linear to Radial Polarization Conversion in the Thz Domain Using a Passive System

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Linear to Radial Polarization Conversion in the Thz Domain Using a Passive System Linear to radial polarization conversion in the THz domain using a passive system T. Grosjean1, F. Baida1, R. Adam2, J-P. Guillet2, L. Billot1, P. Nouvel2, J. Torres2, A. Penarier2, D. Charraut1, L. Chusseau2 1Institut FEMTO-ST, Université de Franche-Comté, UMR 6174 CNRS, Département d’Optique P.M. Duffieux, 16 route de Gray, 25030 Besançon cedex, France. 2Institut d’Électronique du Sud, Université Montpellier 2, UMR 5214 CNRS, Place E. Bataillon, 34095 Montpellier, France. [email protected] Abstract: 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. © 2008 Optical Society of America OCIS codes: (220.4830) Systems design; (230.5440) Polarization-selective devices; (230.7370) Waveguides; (260.5430) Polarization References and links 1. F. C. De Lucia, Sensing with Terahertz radiation, chap. Spectroscopy in the Terahertz spectral region, pp. 39–115 (Springer Series of Optical Science, Springer, Berlin, 2003). 2. A. Markelz, A. Roitberg, and E. Heilweil, “Pulsed terahertz spectroscopy of DNA, bovine serum albumin and collagen between 0.1 and 2 THz,” Chem. Phys. Lett. 320, 42–48 (2000). 3. S. Quabis, R. Dorn, M. Eberler, O. Glöckl, and G. Leuchs, “Focusing Light to a Tighter Spot,” Opt. Commun. 179, 1–7 (2000). 4. K. Youngworth and T. 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