Article

Changes in optical properties of TDO BAM BCC Langmuir films during a phase transition

Moscow University Physics Bulletin (Impact Factor: 0.23). 01/2011; 66:50-53. DOI: 10.3103/S002713491101022X

ABSTRACT The isotherms of water molecule adsorption and the spectra of absorption, diffusion reflection, and polarization of reflected
light for hyperfine Langmuir films that were fabricated based on liquid crystals are investigated. Singularities in the reflection
spectra at the temperature of the structural phase transition (∼70°C) are revealed. Some reasonable assumptions on the nature
of the phase transition are made.

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    ABSTRACT: Electric and electro-optical properties of a smectic liquid crystal (LC) compound formed by rod-like molecules have been investigated in the thin film sandwich geometry typically used in solid-state technology. Thin (~10–30 nm) Langmuir–Blodgett (LB) films of the compound (tetradecyl homologue (n=14) of the series p-oxybenzylidene-p′-amino-2-methylbutyl(α-cyano)cinnamate) were transferred onto glasses covered with a transparent electrode and supplied with a top electrode evaporated in vacuum. In contrast to the LC bulk, thin films of the compound manifest only a solid crystalline phase throughout the whole temperature range (20–110 °C) investigated. Ferroelectric properties of the films (covering linear electro-optic effect, pyroeffect and polarization switching) have been observed in the whole temperature range studied.
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