3A07 表面プラズモンと表面SHGを併用したnCB液晶の蒸着課程の検討

概要

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In the past decade, second-harmonic generation (SHG) have been widely used in order to clarify the anchoring structure of liquid crystal molecules at an interface. In most of the experiments, nCB liquid crystal molecules are deposited by an thermal evaporation method, where a complete monolayer formation is judged from saturation of SHG intensity in an in-situ monitoring of the SHG/evaporation-time isotherm. It is interpreted that the saturation originates from the formation of quadrapolar ordering, where SHG is relatively weaker than that of polar ordering in the first monolayer. However the monolayer formation process is not established yet. In this paper, we examined the in-situ coverage/evaporation-time isotherm by means of attenuated total reflectivity measurement with enhancement of surface plasmon resonance. It was found that the isotherm is similar to that of the SHG isotherm, indicating that the saturation observed in the SHG isotherm is not simply due to formation but rather due to the drastic decrease of adhesion probability of the liquid crystal molecules.
1998-10-12