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Circularly-polarized, semitransparent and double-sided holograms based on helical photonic structures

Recent advances in nanofabrication techniques are opening new frontiers in holographic devices, with the capability to integrate various optical functions in a single device. However, while most efficient holograms are achieved in reflection-mode configurations, they are in general opaque because of...

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Autores principales: Kobashi, Junji, Yoshida, Hiroyuki, Ozaki, Masanori
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5705659/
https://www.ncbi.nlm.nih.gov/pubmed/29184128
http://dx.doi.org/10.1038/s41598-017-16517-9
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author Kobashi, Junji
Yoshida, Hiroyuki
Ozaki, Masanori
author_facet Kobashi, Junji
Yoshida, Hiroyuki
Ozaki, Masanori
author_sort Kobashi, Junji
collection PubMed
description Recent advances in nanofabrication techniques are opening new frontiers in holographic devices, with the capability to integrate various optical functions in a single device. However, while most efficient holograms are achieved in reflection-mode configurations, they are in general opaque because of the reflective substrate that must be used, and therefore, have limited applicability. Here, we present a semi-transparent, reflective computer-generated hologram that is circularly-polarization dependent, and reconstructs different wavefronts when viewed from different sides. The integrated functionality is realized using a single thin-film of liquid crystal with a self-organized helical structure that Bragg reflects circularly-polarized light over a certain band of wavelengths. Asymmetry depending on the viewing side is achieved by exploiting the limited penetration depth of light in the helical structure as well as the nature of liquid crystals to conform to different orientational patterns imprinted on the two substrates sandwiching the material. Also, because the operation wavelength is determined by the reflection band position, pseudo-color holograms can be made by simply stacking layers with different designs. The unique characteristics of this hologram may find applications in polarization-encoded security holograms and see-through holographic signage where different information need to be displayed depending on the viewing direction.
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spelling pubmed-57056592017-12-05 Circularly-polarized, semitransparent and double-sided holograms based on helical photonic structures Kobashi, Junji Yoshida, Hiroyuki Ozaki, Masanori Sci Rep Article Recent advances in nanofabrication techniques are opening new frontiers in holographic devices, with the capability to integrate various optical functions in a single device. However, while most efficient holograms are achieved in reflection-mode configurations, they are in general opaque because of the reflective substrate that must be used, and therefore, have limited applicability. Here, we present a semi-transparent, reflective computer-generated hologram that is circularly-polarization dependent, and reconstructs different wavefronts when viewed from different sides. The integrated functionality is realized using a single thin-film of liquid crystal with a self-organized helical structure that Bragg reflects circularly-polarized light over a certain band of wavelengths. Asymmetry depending on the viewing side is achieved by exploiting the limited penetration depth of light in the helical structure as well as the nature of liquid crystals to conform to different orientational patterns imprinted on the two substrates sandwiching the material. Also, because the operation wavelength is determined by the reflection band position, pseudo-color holograms can be made by simply stacking layers with different designs. The unique characteristics of this hologram may find applications in polarization-encoded security holograms and see-through holographic signage where different information need to be displayed depending on the viewing direction. Nature Publishing Group UK 2017-11-28 /pmc/articles/PMC5705659/ /pubmed/29184128 http://dx.doi.org/10.1038/s41598-017-16517-9 Text en © 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/.
spellingShingle Article
Kobashi, Junji
Yoshida, Hiroyuki
Ozaki, Masanori
Circularly-polarized, semitransparent and double-sided holograms based on helical photonic structures
title Circularly-polarized, semitransparent and double-sided holograms based on helical photonic structures
title_full Circularly-polarized, semitransparent and double-sided holograms based on helical photonic structures
title_fullStr Circularly-polarized, semitransparent and double-sided holograms based on helical photonic structures
title_full_unstemmed Circularly-polarized, semitransparent and double-sided holograms based on helical photonic structures
title_short Circularly-polarized, semitransparent and double-sided holograms based on helical photonic structures
title_sort circularly-polarized, semitransparent and double-sided holograms based on helical photonic structures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5705659/
https://www.ncbi.nlm.nih.gov/pubmed/29184128
http://dx.doi.org/10.1038/s41598-017-16517-9
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