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Journal Articles Materials Horizons Year : 2019

Laser-driven plasmonic gratings for multiple image hiding

Abstract

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.
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Dates and versions

ujm-02053540 , version 1 (01-03-2019)

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Nipun Sharma, Marie Vangheluwe, Francis Vocanson, Anthony Cazier, Matthieu Bugnet, et al.. Laser-driven plasmonic gratings for multiple image hiding. Materials Horizons, 2019, ⟨10.1039/C9MH00017H⟩. ⟨ujm-02053540⟩
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