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Issue 5, 2019
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Laser-driven plasmonic gratings for hiding multiple images

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Hiding several images in a single printing, which appear selectively at different angles of observation, is of great interest for applications in security, data storage or design. Here, we propose an easy-to-implement ink-free laser-based technique to print nanostructured patterns that encode different grey-level images revealed to the eye at specific observation angles. The angular selectivity is provided by diffraction gratings whose orientation can be continuously controlled at the micrometer scale through self-organization mechanisms triggered by laser light. A diffraction yield allowing easy observation with the naked eye is demonstrated, thanks to the use of a thin TiO2:Ag film that also prevents damage to the substrates. The technology based on laser scanning is demonstrated on transparent and flexible substrates that do not sustain high temperature. This ink-free marking technology is flexible, suited to large surfaces, rapid, and provides unique visual effects on any kind of transparent substrate.

Graphical abstract: Laser-driven plasmonic gratings for hiding multiple images

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The article was received on 04 Jan 2019, accepted on 27 Feb 2019 and first published on 27 Feb 2019

Article type: Communication
DOI: 10.1039/C9MH00017H
Mater. Horiz., 2019,6, 978-983

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    Laser-driven plasmonic gratings for hiding multiple images

    N. Sharma, M. Vangheluwe, F. Vocanson, A. Cazier, M. Bugnet, S. Reynaud, A. Vermeulin and N. Destouches, Mater. Horiz., 2019, 6, 978
    DOI: 10.1039/C9MH00017H

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