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Principles for synthesizing longitudinally varying high-order vector fields. (a) Operating principle of the annular metasurface. The green and red lines represent LCP and RCP light, respectively. (b) LCP and RCP partition diagram of the metasurface. (c) Intensity distribution of the x-component and y-component in different regions under the x-LP light illumination. (d) Mode purity of synthetic vector optical fields.
