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. 2022 Oct 17;11:302. doi: 10.1038/s41377-022-00961-y

Fig. 4. Simulation and experimental results of the selected 3D polarization knots at λ = 650 nm.

Fig. 4

a The intensity distributions at different observation planes upon the illumination of RCP light. b The intensity distributions at different observation planes upon the illumination of an LP light beam for polarization distribution detection with different combinations of transmission axes of the linear polarizer and the analyzer. The direction of the white arrows: 45° (z = 485 μm), 0° (z = 500 μm), and 75° (z = 515 μm) w.r.t. the x axis