Abstract
In this paper we have investigated a 16-sector metalens fabricated in a thin film of amorphous silicon and consisting from a set of subwavelength binary diffractive gratings. The metalens converts linearly polarized incident light into an azimuthally polarized optical vortex and focuses it. Experimentally using scanning near-field optical microscope it was shown that the metalens forms an elliptical focal spot with diameters smaller than the diffraction limit: FWHMx = 0.32λ and FWHMy = 0.51λ. The experimental results are close to the results of numerical simulation obtained using FDTD-method FWHMx = 0.37λ and FWHMy = 0.49λ.
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