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Issue 29, 2013
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Terahertz and optical properties of nematic mixtures composed of liquid crystal isothiocyanates, fluorides and cyanides

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Abstract

Several simple nematic eutectic liquid crystal mixtures composed of different two and three ring isothiocyanato compounds as well as mixtures consisting of analogous cyano and fluoro compounds were formulated. The optical properties of the thereby obtained mixtures, i.e. refractive indices, birefringence and absorption coefficients αe and αo are measured in the frequency range between 0.5 and 2.5 THz and in the visible range at 589 nm. Our results show that two mixtures can be identified, which seems particularly promising for applications in the terahertz (THz) range: those consisting only of isothiocyanates show the highest birefringence at THz frequencies while those consisting of isothiocyanates and cyanides have the smallest dichroic ratio over a broad THz range. We also found that in most cases, the absorption coefficients of the isothiocyanato compounds fulfill the relationship αe > αo while for cyano and fluoro compounds, αo > αe is observed as a dominating trend. Furthermore, we show that by carefully selecting constituents of both isothiocyanato and cyano compounds, we can achieve a mixture for which the values of αo are in the same order as for αe for THz frequencies below 2 THz.

Graphical abstract: Terahertz and optical properties of nematic mixtures composed of liquid crystal isothiocyanates, fluorides and cyanides

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Publication details

The article was received on 12 Mar 2013, accepted on 17 May 2013 and first published on 17 May 2013


Article type: Paper
DOI: 10.1039/C3TC30464G
Citation: J. Mater. Chem. C, 2013,1, 4457-4463

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    Terahertz and optical properties of nematic mixtures composed of liquid crystal isothiocyanates, fluorides and cyanides

    M. Reuter, K. Garbat, N. Vieweg, B. M. Fischer, R. Dąbrowski, M. Koch, J. Dziaduszek and S. Urban, J. Mater. Chem. C, 2013, 1, 4457
    DOI: 10.1039/C3TC30464G

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