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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/23/9/4275 |
| _version_ | 1797601769546579968 |
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| author | Tatsiana Mikulchyk Kevin Murphy John Walsh Suzanne Martin Dervil Cody Izabela Naydenova |
| author_facet | Tatsiana Mikulchyk Kevin Murphy John Walsh Suzanne Martin Dervil Cody Izabela Naydenova |
| author_sort | Tatsiana Mikulchyk |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-11T04:07:16Z |
| format | Article |
| id | doaj.art-d5d24b82dad14a8cac091d3dfe4864e9 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-11T04:07:16Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-d5d24b82dad14a8cac091d3dfe4864e92023-11-17T23:42:07ZengMDPI AGSensors1424-82202023-04-01239427510.3390/s23094275Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing ApplicationsTatsiana Mikulchyk0Kevin Murphy1John Walsh2Suzanne Martin3Dervil Cody4Izabela Naydenova5Centre for Industrial and Engineering Optics, School of Physics, Clinical and Optometric Sciences, Faculty of Sciences and Health, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, IrelandCentre for Industrial and Engineering Optics, School of Physics, Clinical and Optometric Sciences, Faculty of Sciences and Health, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, IrelandSchool of Art and Design, Faculty of Arts and Humanities, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, IrelandCentre for Industrial and Engineering Optics, School of Physics, Clinical and Optometric Sciences, Faculty of Sciences and Health, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, IrelandCentre for Industrial and Engineering Optics, School of Physics, Clinical and Optometric Sciences, Faculty of Sciences and Health, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, IrelandCentre for Industrial and Engineering Optics, School of Physics, Clinical and Optometric Sciences, Faculty of Sciences and Health, Technological University Dublin, Grangegorman, D07 H6K8 Dublin, IrelandVolume 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.https://www.mdpi.com/1424-8220/23/9/4275holographic sensorpressure-sensitive photopolymerpressure sensorlaser speckle patternreflection gratingspeckle grating |
| spellingShingle | Tatsiana Mikulchyk Kevin Murphy John Walsh Suzanne Martin Dervil Cody Izabela Naydenova Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications Sensors holographic sensor pressure-sensitive photopolymer pressure sensor laser speckle pattern reflection grating speckle grating |
| 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 | holographic sensor pressure-sensitive photopolymer pressure sensor laser speckle pattern reflection grating speckle grating |
| url | https://www.mdpi.com/1424-8220/23/9/4275 |
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