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15 April 2019 Design of subwavelength grating polarizers to generate cylindrical vector beams
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Abstract
Subwavelength grating polarizers were designed to generate particular cylindrical vector beams. Based on the rigorous vector diffraction theory, the mechanism of the subwavelength gratings converting circularly polarized beam into cylindrical vector beams was analyzed. To obtain the particular type of cylindrical vector beam, a method of design of subwavelength grating polarizers was proposed and the designing procedures has been discussed. The basic function of the polarizer designed in this work is to convert the circularly polarized beam into radially/azimuthally polarized beam. By further improvement, the polarizer could generate complex cylindrical vector beams. Using the Richards-Wolf vectorial diffraction integral, the intensity distributions of the output focused beams from the polarizer were calculated. A phenomenon of divided focal spot was found in the vicinity of the geometrical focus point.
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Guozun Zhou and Weijian Tian "Design of subwavelength grating polarizers to generate cylindrical vector beams", Proc. SPIE 10819, Optical Metrology and Inspection for Industrial Applications V, 1081914 (15 April 2019); https://doi.org/10.1117/12.2501236
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