Abstract
Results of numerical simulation of the optical radiation focusing by Fresnel zone plates (ZP) with the wavelength-scale (mesowavelength) dimensions and the two-layer profile of phase ridges are presented. We show that the dimensions and intensity of the focusing area are sensitive to the ZP design. By changing the phase step shape (height and width of plate faces) it is possible to significantly improve the light field characteristics in the focusing region due to smoothing the wave phase profile after passing through individual ZP layers. The comparison is made with the case of conventional binary ZP.
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The work was supported by the Ministry of Science and Higher Education (V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences).
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Translated by O. Ponomareva
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Geints, Y.E., Panina, E.K. Optimal Light Focusing with a Fresnel Mesowavelength Phase Plate with Stepped Zone Profile. Atmos Ocean Opt 35, 817–823 (2022). https://doi.org/10.1134/S1024856022060124
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DOI: https://doi.org/10.1134/S1024856022060124