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Vectorial vortex mode transformation for a hollow waveguide using Pancharatnam–Berry phase optical elements

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Abstract

Transformation and inverse transformation between a free-space linearly polarized beam and the vectorial vortex mode of a circular hollow waveguide by use of Pancharatnam–Berry phase optical elements is proposed. Demonstration was achieved by fabricating GaAs subwavelength gratings and utilizing a 300μm diameter hollow metallic waveguide for 10.6μm wavelength CO2 laser radiation. The mode transformations and the excitation of a single vectorial mode inside the hollow waveguide were verified by full polarization measurements. In addition, the inverse mode transformation of the single vectorial mode excitation in the waveguide enabled us to experimentally obtain a linearly polarized bright spot with a high central lobe.

© 2006 Optical Society of America

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