Experimental Soft Matter Physics

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

Elucidating the fine details of cholesteric liquid crystal shell reflection patterns
Yong Geng, JungHyun Noh, Irena Drevensek-Olenik, Romano Rupp, and Jan P. F. Lagerwall
Liquid Crystals, DOI: 10.1080/02678292.2017.1363916 (2017)

Why organically functionalized nanoparticles increase the electrical conductivity of nematic liquid crystal dispersions
Martin Urbanski, and Jan P. F. Lagerwall Journal of Materials Chemistry C, DOI: 10.1039/C7TC02856C (2017)

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Liquid crystals in micron-scale droplets, shells, and fibers
Martin Urbanski, Catherine G. Reyes, JungHyun Noh, Anshul Sharma, Yong Gang, Venkata Subba Rao Jampani, Jan P.F. Lagerwall
J. Phys,: Condens. Matter, DOI: 10.1088/1361-648X/aa5706 (2017)

More publications can be found here.