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Proceedings Paper

Nematic colloidal tilings as photonic materials
Author(s): M. Ravnik; J. Dontabhaktuni; M. Cancula; S. Zumer
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Paper 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.

Paper Details

Date Published: 19 February 2014
PDF: 7 pages
Proc. SPIE 9004, Emerging Liquid Crystal Technologies IX, 90040C (19 February 2014); doi: 10.1117/12.2044586
Show Author Affiliations
M. Ravnik, Univ. of Ljubljana (Slovenia)
Ctr. of Excellence NAMASTE (Slovenia)
J. Dontabhaktuni, Univ. of Ljubljana (Slovenia)
Univ. of Hyderabad (India)
M. Cancula, Univ. of Ljubljana (Slovenia)
S. Zumer, Univ. of Ljubljana (Slovenia)
Ctr. of Excellence NAMASTE (Slovenia)
Jozef Stefan Institute (Slovenia)

Published in SPIE Proceedings Vol. 9004:
Emerging Liquid Crystal Technologies IX
Liang-Chy Chien; Antonio M. Figueiredo Neto; Kristiaan Neyts; Masanori Ozaki, Editor(s)

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