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

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 sol...

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Bibliographic Details
Published in:Polymers 2018-07, Vol.10 (7), p.805
Main Authors: Gao, Shaohua, Zhai, Yanzi, Zhang, Xinzheng, Song, Xiao, Wang, Jiayi, Drevensek-Olenik, Irena, Rupp, Romano A, Xu, Jingjun
Format: Article
Language:English
Subjects:
Banded structure
Cholesteric liquid crystals
Computer simulation
Coupling
Crystal defects
Crystal structure
Crystals
Defects
Finite difference time domain method
Lasers
Light
Optical properties
Photonic band gaps
Photonics
Physics
Polyvinyl alcohol
Solid state physics
Time domain analysis
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Summary: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.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym10070805