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Polymers 2018, 10(7), 805; https://doi.org/10.3390/polym10070805

Coupling of Defect Modes in Cholesteric Liquid Crystals Separated by Isotropic Polymeric Layers

1
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
2
Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19 and Department of Complex Matter, J. Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
3
Faculty of Physics, Vienna University, Boltzmanngasse 5, A-1090 Wien, Austria
4
Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China
*
Authors to whom correspondence should be addressed.
Received: 5 June 2018 / Revised: 15 July 2018 / Accepted: 20 July 2018 / Published: 23 July 2018
(This article belongs to the Special Issue Liquid Crystalline Polymers)
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Abstract

Cholesteric liquid crystal structures with multiple isotropic defect layers exhibit localized optical modes (defect modes). Coupling effects between these modes were simulated using the finite difference time domain method. Analogous to the well-known result of the tight-binding approximation in solid state physics, splitting of the defect modes takes place, as soon as the structure contains more than one defect layer. The dispersion relation of the mini-bands forming within the photonic band gap of the structure is calculated numerically. The structures might have promising applications for multiwavelength filters and low-threshold lasers. View Full-Text
Keywords: cholesteric liquid crystals; optical defect modes; mode coupling; photonic density of state cholesteric liquid crystals; optical defect modes; mode coupling; photonic density of state
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Gao, S.; Zhai, Y.; Zhang, X.; Song, X.; Wang, J.; Drevensek-Olenik, I.; Rupp, R.A.; Xu, J. Coupling of Defect Modes in Cholesteric Liquid Crystals Separated by Isotropic Polymeric Layers. Polymers 2018, 10, 805.

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