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Secure authentication based on liquid crystal-generated patterns

We recently demonstrated that a colloidal crystal of shells of cholesteric liquid crystal generates complex patterns of circularly polarized multicolored spots, if it is illuminated by white light. The pattern changes as a function of which area is illuminated. The introduction of randomness in how the shells are arranged makes every pattern unique.

Together with Dr. Gabriele Lenzini at the University of Luxembourg Center for Security and Trust we are exploring the potential of using these systems in the context of secure authentication, e.g. of persons or products.

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Three most recent publications

Isotropic-isotropic phase separation and spinodal decomposition in liquid crystal-solvent mixtures, Catherine G. Reyes, Jörg Baller, Takeaki Araki and Jan P. F. Lagerwall , soft matter, 2019,15, 6044-6054

Liquid crystal elastomer shell actuators with negative order parameter, V. S. R. Jampani, R. H. Volpe, K. Reguengo de Sousa, J. Ferreira Machado, C. M. Yakacki and J. P. F. Lagerwall, Sci.adv.,DOI 10.1126/sciadv.aaw2476

Influence of head group and chain length of surfactants using for stabilising liquid crystal shells,
Anjali Sharma and J.P.F. Lagerwall,
Liquid crystals, DOI 10.1080/02678292.2018.1509391

More publications can be found here.