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Proceedings Paper

Tunable photonic devices based on the temperature dependent photonic band gap in chiral nematic liquid crystals
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Paper Abstract

We have investigated the physical and optical properties of the left-handed chiral dopant ZLI-811 mixed in a nematic liquid crystal (LC) host BL006. The solubility of ZLI-811 in BL006 at room temperature is ~24 wt%, but can be enhanced by increasing the temperature. Consequently, the photonic band gap of the cholesteric liquid crystal (CLC) mixed with more than 24 wt% chiral dopant ZLI-811 is blue shifted as the temperature increases. Based on this property, we demonstrate its applications in thermally tunable band-pass filters and dye-doped CLC lasers. In addition, we also demonstrated a spatially tunable laser emission by generating a one-dimensional temperature gradient along the dye-doped cholesteric liquid crystal (CLC) cell. The lasing wavelength is widely tunable from 577 nm to 670 nm. The lowest excitation energy and maximum lasing efficiency occur at λ~605 nm which corresponds to the peak fluorescence emission of the dye.

Paper Details

Date Published: 15 September 2006
PDF: 7 pages
Proc. SPIE 6332, Liquid Crystals X, 63320F (15 September 2006); doi: 10.1117/12.678056
Show Author Affiliations
Yuhua Huang, College of Optics and Photonics, Univ. of Central Florida (United States)
Ying Zhou, College of Optics and Photonics, Univ. of Central Florida (United States)
Shin-Tson Wu, College of Optics and Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 6332:
Liquid Crystals X
Iam-Choon Khoo, Editor(s)

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