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. 2017 Dec 21;7:18011. doi: 10.1038/s41598-017-18147-7

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Analysis of the UniPD logo CGH for increasing lateral misplacement with respect to the input beam with indices (p = 1, ℓ = +1). Experimental SNR (calculated with respect to the aligned configuration) as a function of the lateral shift Δx. Inset pictures: experimental far-field for several values of Δx. (b) Experimental far-field for increasing positions of the CGH along the z-axis, i.e. along the beam axis. (c) The same CGH, centered and aligned with respect to the input beam, illuminated with OAM beams carrying index values different from the original ones. The University of Padova logo is © University of Padova and used with permission.