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Study on Optical Properties and Applications of Liquid Crystals in Long Wavelength Regions

长波长区液晶光学性质及应用研究

基本信息

批准号：
06805001
负责人：
SATO Susumu
金额：
$ 1.22万
依托单位：
AKITA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06805001/
关键词：
Liquid Crystal Infrared Optical Properties Submillimeter Wave Refractive Index Birefringence Absorption 複屈折率

项目摘要

1. Optical properties of nematic liquid crystals and their applications in infrared regions(1) Measurement systems for the properties of nematic liquid crystals in infrared regions are constructed and transmission spectra of several substrates and liquid crystal materials are measured and evaluated.(2) Birefringence properties of nematic liquid crystals are measured by using transmission properties in homogeneously aligned liquid crystal cells under a voltage application or the light transmission intensity ratios of an ordinary and extraordinary ray.(3) As electrooptical effects of nematic liquid crystals, TN effects in the infrared region, electrooptical effects in absorption band of liquid crystals, polarization controlling effects by the liquid crystal cells with an axially symmetrical molecular orientation, and light scattering effects in infrared regions by liquid crystal microlens arrays are measured and discussed.2. Optical properties of nematic liquid crystals and their applications in submillimeter wavelength regions(1) Transmission properties at the wavelengths of 118,215 and 435 [mum] are measured by using a CH_2F_2 submillimeter wave laser that is excited by a CO_2 laser. Refractive indices for ordinary and extraordinary ray are measured by changing the tilt angle of homogeneously aligned liquid crystal cells. Absorption effects can be ignored since the liquid crystal layr is effectively thin.(2) Transmittance of the liquid crystal microlens array cell can be modulated for about 30 [%] by applying a voltage across the cell. Phase change of lambda/8-lambda/10 (lambda=118 [mum]) corresponding to the birefringence of 0.12-0.15 can be obtained in the homogeneously aligned liquid crystal (K15) cell by applying a voltage.

1.红外区双折射液晶的光学性质及其应用（1）建立了红外区双折射液晶性质的测量系统，测量和评价了几种基片和液晶材料的透射光谱。(2)双折射液晶的双折射性能是通过使用在电压施加下均匀排列的液晶单元中的透射性能或寻常射线和非常射线的光透射强度比来测量的。(3)作为双折射液晶的电光效应，测量并讨论了红外区的TN效应、液晶吸收带的电光效应、轴对称分子取向液晶盒的偏振控制效应以及液晶微透镜阵列在红外区的光散射效应.亚毫米波段的双折射液晶的光学性质及其应用（1）用CO_2激光器激发CH_2F_2亚毫米波激光器，测量了118、215和435 μ m波段的透射特性。通过改变均匀取向液晶盒的倾斜角，测量了寻常光和非常光的折射率。吸收效应可以忽略，因为液晶层实际上是薄的。(2)液晶微透镜阵列单元的透射率可以通过在单元两端施加电压来调制约30 [%]。通过施加电压，可以在均匀取向的液晶（K15）单元中获得对应于0.12-0.15的双折射的λ/8-λ/10（λ =118 μ m）的相变。