19 February 2014 Nematic colloidal tilings as photonic materials
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Proceedings Volume 9004, Emerging Liquid Crystal Technologies IX; 90040C (2014) https://doi.org/10.1117/12.2044586
Event: SPIE OPTO, 2014, San Francisco, California, United States
Abstract
Colloidal platelets are explored as elementary building blocks for the shape-controlled assembly of crystalline and quasicrystalline tilings. Using three-dimensional (3D) numerical modelling based on the minimization of Landau-de Gennes free energy for modelling of colloids combined with Finite Difference Time Domain calculations for optics, we demonstrate the self-assembly and optical (transmission) properties of triangular, square and pentagonal sub-micrometer sized platelets in a thin layer of nematic liquid crystal. Interactions between platelets are explored, providing an insight into the assembly process. Two-dimensional tilings of various-shaped colloidal platelets are demonstrated, and their use as diffraction layers is explored by using FDTD simulations. Designing symmetry-breaking surface anchoring profiles on pentagonal platelets opens also a possibility to achieve interactions that could lead to tilings with non-crystalline symmetry.
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M. Ravnik, J. Dontabhaktuni, M. Cancula, S. Zumer, "Nematic colloidal tilings as photonic materials", Proc. SPIE 9004, Emerging Liquid Crystal Technologies IX, 90040C (19 February 2014); doi: 10.1117/12.2044586; https://doi.org/10.1117/12.2044586
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