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. 2021 Jul 26;11(8):1920. doi: 10.3390/nano11081920

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The characterizations of the fabricated singlet metalens. (a) A scanning electron micrograph (SEM) image of the local part from the fabricated metalens. (b) Optical image of the central part from the fabricated metalens under 532 nm microscopic illuminating light. (c) Measured focal spot intensity profile at 532 nm wavelength by a commercial object (100 × OLYMPUS, NA = 0.90). (d) Simulated focal spot intensity profile at 532 nm wavelength by FDTD method. (e) Magnified image of the measured focal spot intensity profile from (c). (f) Central focal spot intensity profiles along horizontal axis from (d) and (e), respectively.