Prof. Jiangang Lu Profile

Prof. Jiangang Lu

at Shanghai Jiao Tong Univ

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Proceedings Article | 19 September 2017 Presentation

Template effect of twist structure liquid crystal and its photonic application (Conference Presentation)

Jiangang Lu

Proceedings Volume 10361, 103610G (2017) https://doi.org/10.1117/12.2273131

KEYWORDS: Liquid crystals, Polymers, Optical spheres, Phase shift keying, Random lasers, Photonic crystals, Laser crystals, Molecular self-assembly, Temperature metrology, Surface plasmons

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The template effect of self-assembly twist structure liquid crystal (LC) is investigated. The anchoring energy of blue phase (BP) template containing different concentration of conventional polymer has been investigated that every different polymer system had its own threshold concentration to reconstruct the blue phase. The anchoring energy of the BP template increased with the polymer concentration resulting in the improvement of the reconstruction capacity. No matter with the same-handed or reverse-handed chiral materials refilling, there was a concentration range for the chiral dopant to reconstruct the blue phase by the polymer template. And the reconstruction range of the templates was extended as the polymer concentration of the template increased. It was demonstrated that the template anchoring energy has a threshold value to reassemble the double twist cylinder structure of BPLC by either refilling same-handed chiral materials or reverse-handed chiral materials which may help to improve the driving capacity of the polymer stabilized BPLC. Similar to the BPLC, a sphere phase template was proposed to improve the temperature range of sphere phase (SP) to more than 175℃.By template processing, a wavelength tunable random lasing was demonstrated with dye doped SPLC. With different polymer concentrations, the reconstructed sphere phase random lasing may achieve more than 40nm wavelength shifting by electrical field modulation. And the threshold energy of SPLC random laser can be lowered to about 30% of that from the chiral nematic phase LC.

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