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Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications

Volume reflection hologram-based sensors are designed to visibly change colour in response to a target stressor or analyte. However, reflection holograms fabricated in thick photopolymer films are highly angularly selective, making these sensors challenging to view and interpret by non-experts. Here...

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Detalles Bibliográficos
Autores principales: Mikulchyk, Tatsiana, Murphy, Kevin, Walsh, John, Martin, Suzanne, Cody, Dervil, Naydenova, Izabela
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10181154/
https://www.ncbi.nlm.nih.gov/pubmed/37177479
http://dx.doi.org/10.3390/s23094275
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author Mikulchyk, Tatsiana
Murphy, Kevin
Walsh, John
Martin, Suzanne
Cody, Dervil
Naydenova, Izabela
author_facet Mikulchyk, Tatsiana
Murphy, Kevin
Walsh, John
Martin, Suzanne
Cody, Dervil
Naydenova, Izabela
author_sort Mikulchyk, Tatsiana
collection PubMed
description Volume reflection hologram-based sensors are designed to visibly change colour in response to a target stressor or analyte. However, reflection holograms fabricated in thick photopolymer films are highly angularly selective, making these sensors challenging to view and interpret by non-experts. Here, the use of speckle holography to improve the visibility of reflection holograms is presented. A novel recording approach combining speckle recording techniques with Denisyuk reflection recording geometry is described. The recorded speckle reflection grating operates as a series of multiplexed reflection gratings with a range of spatial frequencies, capable of reflecting light at a wider range of angles. A comparative study of the angular and wavelength selectivity of speckle and standard reflection gratings was conducted. The FWHM of the angular selectivity curves of the speckle reflection gratings is doubled (4°) in comparison to standard 4500 lines/mm reflection gratings (2°). The wavelength selectivity FWHM is also doubled from 4.2 to 8.6 nm. The comparative ability of the speckle and standard reflection gratings to act as colour-changing compressional pressure sensors in the 0.88–5.31 MPa range is described. Finally, we present a prototype reflection hologram viewer which enables the easy observation of angularly specific reflection holograms by non-experts.
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spelling pubmed-101811542023-05-13 Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications Mikulchyk, Tatsiana Murphy, Kevin Walsh, John Martin, Suzanne Cody, Dervil Naydenova, Izabela Sensors (Basel) Article Volume reflection hologram-based sensors are designed to visibly change colour in response to a target stressor or analyte. However, reflection holograms fabricated in thick photopolymer films are highly angularly selective, making these sensors challenging to view and interpret by non-experts. Here, the use of speckle holography to improve the visibility of reflection holograms is presented. A novel recording approach combining speckle recording techniques with Denisyuk reflection recording geometry is described. The recorded speckle reflection grating operates as a series of multiplexed reflection gratings with a range of spatial frequencies, capable of reflecting light at a wider range of angles. A comparative study of the angular and wavelength selectivity of speckle and standard reflection gratings was conducted. The FWHM of the angular selectivity curves of the speckle reflection gratings is doubled (4°) in comparison to standard 4500 lines/mm reflection gratings (2°). The wavelength selectivity FWHM is also doubled from 4.2 to 8.6 nm. The comparative ability of the speckle and standard reflection gratings to act as colour-changing compressional pressure sensors in the 0.88–5.31 MPa range is described. Finally, we present a prototype reflection hologram viewer which enables the easy observation of angularly specific reflection holograms by non-experts. MDPI 2023-04-25 /pmc/articles/PMC10181154/ /pubmed/37177479 http://dx.doi.org/10.3390/s23094275 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/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/).
spellingShingle Article
Mikulchyk, Tatsiana
Murphy, Kevin
Walsh, John
Martin, Suzanne
Cody, Dervil
Naydenova, Izabela
Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications
title Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications
title_full Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications
title_fullStr Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications
title_full_unstemmed Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications
title_short Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications
title_sort improving the angular visibility of photopolymer-based reflection holograms for sensing applications
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10181154/
https://www.ncbi.nlm.nih.gov/pubmed/37177479
http://dx.doi.org/10.3390/s23094275
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