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Holographic colour prints for enhanced optical security by combined phase and amplitude control

Conventional optical security devices provide authentication by manipulating a specific property of light to produce a distinctive optical signature. For instance, microscopic colour prints modulate the amplitude, whereas holograms typically modulate the phase of light. However, their relatively sim...

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Autores principales: Lim, Kevin T. P., Liu, Hailong, Liu, Yejing, Yang, Joel K. W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6318302/
https://www.ncbi.nlm.nih.gov/pubmed/30604762
http://dx.doi.org/10.1038/s41467-018-07808-4
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author Lim, Kevin T. P.
Liu, Hailong
Liu, Yejing
Yang, Joel K. W.
author_facet Lim, Kevin T. P.
Liu, Hailong
Liu, Yejing
Yang, Joel K. W.
author_sort Lim, Kevin T. P.
collection PubMed
description Conventional optical security devices provide authentication by manipulating a specific property of light to produce a distinctive optical signature. For instance, microscopic colour prints modulate the amplitude, whereas holograms typically modulate the phase of light. However, their relatively simple structure and behaviour is easily imitated. We designed a pixel that overlays a structural colour element onto a phase plate to control both the phase and amplitude of light, and arrayed these pixels into monolithic prints that exhibit complex behaviour. Our fabricated prints appear as colour images under white light, while projecting up to three different holograms under red, green, or blue laser illumination. These holographic colour prints are readily verified but challenging to emulate, and can provide enhanced security in anti-counterfeiting applications. As the prints encode information only in the surface relief of a single polymeric material, nanoscale 3D printing of customised masters may enable their mass-manufacture by nanoimprint lithography.
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spelling pubmed-63183022019-01-07 Holographic colour prints for enhanced optical security by combined phase and amplitude control Lim, Kevin T. P. Liu, Hailong Liu, Yejing Yang, Joel K. W. Nat Commun Article Conventional optical security devices provide authentication by manipulating a specific property of light to produce a distinctive optical signature. For instance, microscopic colour prints modulate the amplitude, whereas holograms typically modulate the phase of light. However, their relatively simple structure and behaviour is easily imitated. We designed a pixel that overlays a structural colour element onto a phase plate to control both the phase and amplitude of light, and arrayed these pixels into monolithic prints that exhibit complex behaviour. Our fabricated prints appear as colour images under white light, while projecting up to three different holograms under red, green, or blue laser illumination. These holographic colour prints are readily verified but challenging to emulate, and can provide enhanced security in anti-counterfeiting applications. As the prints encode information only in the surface relief of a single polymeric material, nanoscale 3D printing of customised masters may enable their mass-manufacture by nanoimprint lithography. Nature Publishing Group UK 2019-01-03 /pmc/articles/PMC6318302/ /pubmed/30604762 http://dx.doi.org/10.1038/s41467-018-07808-4 Text en © The Author(s) 2019 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/.
spellingShingle Article
Lim, Kevin T. P.
Liu, Hailong
Liu, Yejing
Yang, Joel K. W.
Holographic colour prints for enhanced optical security by combined phase and amplitude control
title Holographic colour prints for enhanced optical security by combined phase and amplitude control
title_full Holographic colour prints for enhanced optical security by combined phase and amplitude control
title_fullStr Holographic colour prints for enhanced optical security by combined phase and amplitude control
title_full_unstemmed Holographic colour prints for enhanced optical security by combined phase and amplitude control
title_short Holographic colour prints for enhanced optical security by combined phase and amplitude control
title_sort holographic colour prints for enhanced optical security by combined phase and amplitude control
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6318302/
https://www.ncbi.nlm.nih.gov/pubmed/30604762
http://dx.doi.org/10.1038/s41467-018-07808-4
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