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. 2018 Mar 23;7:17157. doi: 10.1038/lsa.2017.157

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Copyright © 2018 The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Simulated phase-dependence of focal properties for interaction of (a) identical Fresnel zone plate patterns (as in Figure 3) and (b) Fresnel zone plate patterns of different size (as in Figure 4) on a beam splitter. The intensity is normalized by the focal intensity produced by lens pattern A alone. Row 1 shows the intensity distribution for each zone plate pattern alone, rows 2 and 3 show the peak intensity and FWHM focal diameter at the nominal focal distance of z=15 μm. Row 4 shows the FWHM focal depth. All color scales show intensity.