Article (Scientific journals)
High-fidelity spherical cholesteric liquid crystal Bragg reflectors generating unclonable patterns for secure authentication
Geng, Yong; Noh, Junghyun; Drevensek-Olenik, Irena et al.
2016In Scientific Reports, 6 (26840), p. 1-8
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Keywords :
Cholesteric Liquid Crystal; Physical Unclonable Functions
Abstract :
[en] Monodisperse cholesteric liquid crystal microspheres exhibit spherically symmetric Bragg reflection, generating, via photonic cross communication, dynamically tuneable multi-coloured patterns. These patterns, uniquely defined by the particular sphere arrangement, could render cholesteric microspheres very useful in countless security applications, as tags to identify and authenticate their carriers, mainly physical objects or persons. However, the optical quality of the cholesteric droplets studied so far is unsatisfactory, especially after polymerisation, a step required for obtaining durable samples that can be used for object identification. We show that a transition from droplets to shells solves all key problems, giving rise to sharp patterns and excellent optical quality even after polymerisation, the polymerised shells sustaining considerable mechanical deformation. Moreover, we demonstrate that, counter to prior expectation, cross communication takes place even between non-identical shells. This opens additional communication channels that add significantly to the complexity and unique character of the generated patterns.
Research center :
University of Luxembourg and Interdisciplinary Center for Security, Reliability and Trust
Disciplines :
Chemistry
Author, co-author :
Geng, Yong ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Noh, Junghyun ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Drevensek-Olenik, Irena
Rupp, Romano
Lenzini, Gabriele ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
Lagerwall, Jan  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
External co-authors :
yes
Language :
English
Title :
High-fidelity spherical cholesteric liquid crystal Bragg reflectors generating unclonable patterns for secure authentication
Publication date :
27 March 2016
Journal title :
Scientific Reports
ISSN :
2045-2322
Publisher :
Nature Publishing Group, London, United Kingdom
Special issue title :
Scientific Reports
Volume :
6
Issue :
26840
Pages :
1-8
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Computational Sciences
European Projects :
H2020 - 648763 - INTERACT - Intelligent Non-woven Textiles and Elastomeric Responsive materials by Advancing liquid Crystal Technology
Name of the research project :
R-AGR-0505 - IRP15 - UNIQUE (20150401-20180331) - LAGERWALL Jan
Funders :
European Resarch Council
University of Luxembourg - UL
CE - Commission Européenne [BE]
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since 01 June 2016

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