Development of a New Technique of Analyzing the Liquid Crystal Interface Reorientation Dynamics using Reflection FT-IR Time-Resolved Spectroscopy

开发利用反射 FT-IR 时间分辨光谱分析液晶界面重定向动力学的新技术

• 批准号: 07554086
• 负责人: TORIUMI Hirokazu
• 金额: $ 0.7万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07554086/
• 关键词: Liquid Crystals; Surface Orientation; Dynamics; Time-Resolved FT-IR; Spectroellipsometry; Nematic Liquid Crystals; Ferroelectric Smectic Liquid Crystals; 電場応答ダイナミクス; 時間分析FT-IR; アンカリング効果; 高感度反射法; デプスプロファイリング; ダイナミクス解析; 高感度反射測定

In this study, we have developed two new spectroscopic techniques, both with spacial and temporal resolution, in order to analyze the liquid crystal reorientation dynamics at the substrate surfaces.1.First, in order to analyze the elementary segmental processes of liquid-crystalline molecules during their electric-field induced reorientational transition, we have developed a new step-scan FT-IR time-resolved spectroscopy (FT-IR TRS) with 200ns time-resolution.Applicability of this new techniques has been demonstrated for nematic liquid crystals and for ferrolelectric smectic liquid crystals.2.To improve the spacial resolution and make it possible to analyze the liquid-crystal's surface reorientation dynamics, we have also developed a new time-resolved, polarization-modulated spectroellipsometry system (PMSE). This system, with 100nm spacial resolution and 20mus time-resolution, has enabled us to quantitatively analyze the surface anchoring effect and the director reorientation dynamics of liquid crystals in the very vicinity of substrate surfaces.By developing these new spectroscopic techniques, we have been able to open up a new field of dynamic analysis of liquid crystals that can penetrate into the detailed submolecular mechanisms of the field-induced reorientational transition in both nematic and smectic liquid crystals. The results obtained in this study are expected to be able to contribute to the further development of liquid crystal display devices.

在这项研究中，我们发展了两种新的光谱技术，包括空间分辨率和时间分辨率，以分析基片表面的液晶重定向动力学。1.为了分析液晶分子在电场诱导重定向转变过程中的基本链段过程，我们发展了一种新的步进扫描FT-IR时间分辨光谱(FT-IR TRS)，时间分辨率为200 ns。该新技术已被应用于向列型液晶和铁电近晶液晶。2.为了提高空间分辨率，使分析液晶表面重定向动力学成为可能，我们还开发了一种新的时间分辨偏振调制椭圆偏振光谱系统(PMSE)。该系统具有100 nm的空间分辨率和20微秒的时间分辨率，使我们能够定量地分析液晶在衬底表面附近的表面锚定效应和指向矢重定向动力学。通过发展这些新的光谱技术，我们能够开辟一个新的液晶动态分析领域，可以深入到向列相和近晶液晶中场致重定向转变的详细亚分子机制。本研究成果可望为液晶显示器件的进一步发展做出贡献。

项目成果

T.Fukazawa, T.Tadokoro, H.Toriumi, T.Akahane, and M.Kimura: "Application of Time-Resolved Spectroellipsometry to the study of Liquid Crystal Reorientation Dynamics" Thin Sold Films. 313-314. 799-802 (1998)

T.Fukazawa、T.Tadokoro、H.Toriumi、T.Akahane 和 M.Kimura：“时间分辨光谱椭偏仪在液晶重定向动力学研究中的应用”薄膜。

H.Toriumi et al.: "Real Time Analysis of Liquid Crystal Surface Orientation Dynamics Using Polarization Modulated Spectroellipsometry" Jpn.J.Appl.Phys.36. L1207-L1210 (1997)

H.Toriumi 等人：“使用偏振调制光谱椭圆光度法实时分析液晶表面取向动力学”Jpn.J.Appl.Phys.36。

H.Toriumi et al.: "Nematic Director Reorientation Dynamics Studied by FT-IR Time-Resolved Spectroscopy" Jpn.J.Appl.Phys. I-37. 608-612 (1998)

H.Toriumi 等人：“通过 FT-IR 时间分辨光谱研究的向列导向重取向动力学”Jpn.J.Appl.Phys。

T.Tadokoro, T.Fukazawa, and H.Toriumi: "Real Time Analysis of Liquid Crystal Surface Orientation Dynamics Using Polarization Modulated Spectroellipsometry" Jpn.J.Appl.Phys.36. L1207-L1210 (1997)

T.Tadokoro、T.Fukazawa 和 H.Toriumi：“使用偏振调制光谱椭圆光度法实时分析液晶表面取向动力学”Jpn.J.Appl.Phys.36。