{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:06:09Z","timestamp":1760148369537,"version":"build-2065373602"},"reference-count":31,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2023,4,25]],"date-time":"2023-04-25T00:00:00Z","timestamp":1682380800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001588","name":"Enterprise Ireland Commercialisation Fund","doi-asserted-by":"publisher","award":["CF\/2015\/0076P","CF\/2017\/0648P","18\/SIRG\/5666"],"award-info":[{"award-number":["CF\/2015\/0076P","CF\/2017\/0648P","18\/SIRG\/5666"]}],"id":[{"id":"10.13039\/501100001588","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001602","name":"Science Foundation Ireland","doi-asserted-by":"publisher","award":["CF\/2015\/0076P","CF\/2017\/0648P","18\/SIRG\/5666"],"award-info":[{"award-number":["CF\/2015\/0076P","CF\/2017\/0648P","18\/SIRG\/5666"]}],"id":[{"id":"10.13039\/501100001602","id-type":"DOI","asserted-by":"publisher"}]},{"name":"TU Dublin Innovation Office","award":["CF\/2015\/0076P","CF\/2017\/0648P","18\/SIRG\/5666"],"award-info":[{"award-number":["CF\/2015\/0076P","CF\/2017\/0648P","18\/SIRG\/5666"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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\u00b0) in comparison to standard 4500 lines\/mm reflection gratings (2\u00b0). 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\u20135.31 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.<\/jats:p>","DOI":"10.3390\/s23094275","type":"journal-article","created":{"date-parts":[[2023,4,26]],"date-time":"2023-04-26T01:44:42Z","timestamp":1682473482000},"page":"4275","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3162-5666","authenticated-orcid":false,"given":"Tatsiana","family":"Mikulchyk","sequence":"first","affiliation":[{"name":"Centre for Industrial and Engineering Optics, School of Physics, Clinical and Optometric Sciences, Faculty of Sciences and Health, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2446-4064","authenticated-orcid":false,"given":"Kevin","family":"Murphy","sequence":"additional","affiliation":[{"name":"Centre for Industrial and Engineering Optics, School of Physics, Clinical and Optometric Sciences, Faculty of Sciences and Health, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, Ireland"}]},{"given":"John","family":"Walsh","sequence":"additional","affiliation":[{"name":"School of Art and Design, Faculty of Arts and Humanities, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4735-7897","authenticated-orcid":false,"given":"Suzanne","family":"Martin","sequence":"additional","affiliation":[{"name":"Centre for Industrial and Engineering Optics, School of Physics, Clinical and Optometric Sciences, Faculty of Sciences and Health, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8921-0201","authenticated-orcid":false,"given":"Dervil","family":"Cody","sequence":"additional","affiliation":[{"name":"Centre for Industrial and Engineering Optics, School of Physics, Clinical and Optometric Sciences, Faculty of Sciences and Health, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0810-2197","authenticated-orcid":false,"given":"Izabela","family":"Naydenova","sequence":"additional","affiliation":[{"name":"Centre for Industrial and Engineering Optics, School of Physics, Clinical and Optometric Sciences, Faculty of Sciences and Health, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, Ireland"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1016\/j.snb.2008.08.020","article-title":"Characterisation of the humidity and temperature responses of a reflection hologram recorded in acrylamide-based photopolymer","volume":"139","author":"Naydenova","year":"2009","journal-title":"Sens. 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