Abstract

We propose an efficient method to achromatically transform a circularly polarized beam to a radially polarized beam in the visible range using segmented subwavelength metal wire gratings. We present a theoretical analysis of the relationship between the polarization purity of the transmitted beams and the number of segments. To verify our analysis, we fabricate a device composed of four quadrant sectors of subwavelength metal wire gratings and measure the transformation properties of the device at visible wavelengths of 488โ€‰nm, 532โ€‰nm, and 633โ€‰nm, which show a good agreement with theoretical results and the broadband achromatic property of the generation method.

© 2009 Optical Society of America

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