Smartphone Authentication of Unclonable Anticounterfeiting Labels based on a Microlens Array atop a Microphosphor‐Doped Layer
Abstract: A phosphor‐particle‐loaded microlens array on a polymer substrate offers an attractive unclonable anticounterfeiting label design. A random pattern of bright emission points is created due to the random coincidences of light focused by a microlens with an underlying phosphor microparticle. The change of the bright point patter with the angle of the incident light (owing to a shift in the locations of the focal points) makes the labels unclonable. This work examines the authentication of such labels using a single smartphone. The smartphone flashlight provides illumination whereas the camera is used for detection (optical filters prevent capture of scattered source light). A 196‐bit binary string is created from the captured images to identify which lenses in the 14 × 14 array create bright emission points for a given position of the smartphone. The classification of test and reference images as matching or not is achieved with >99% confidence, as is a 1 cm tolerance for the positioning accuracy of the smartphone. Moreover, authentication is possible for different distances between flash and camera provided this is less than 3 cm. In summary, the present work quantifies the good potential of the microlens array microphosphor unclonable label concept for authentication using a smartphone.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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Smartphone Authentication of Unclonable Anticounterfeiting Labels based on a Microlens Array atop a Microphosphor‐Doped Layer ; day:27 ; month:01 ; year:2023 ; extent:13
Advanced Materials Technologies ; (27.01.2023) (gesamt 13)
- Creator
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Kumar, Vinay
Gota, Fabrizio
Neyret, Julien
Katumo, Ngei
Chauhan, Aditya
Dottermusch, Stephan
Richards, Bryce S.
Howard, Ian A.
- DOI
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10.1002/admt.202201311
- URN
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urn:nbn:de:101:1-2023012814095475683782
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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15.08.2025, 7:27 AM CEST
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Kumar, Vinay
- Gota, Fabrizio
- Neyret, Julien
- Katumo, Ngei
- Chauhan, Aditya
- Dottermusch, Stephan
- Richards, Bryce S.
- Howard, Ian A.
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