Research Works for the Electro-optic Effects of the Liquid Crystal Materials in the Ultra -High Frequency Region

液晶材料超高频电光效应研究工作

• 批准号: 15560011
• 负责人: NOSE Toshiaki
• 金额: $ 1.34万
• 依托单位: Akita Prefectural University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560011/
• 关键词: Liquid Crystals; Millimeter Wave; Refractive Index; Electro-Optic Effects; 複素誘電率

We have developed a new estimation method of the refractive indices of the liquid crystal materials in the millimeter wave region by using the rectangular waveguide both fur Vband and the W band Complex refractive indices of the liquid crystal materials in the millimeter wave region (50GHz-110GHz) can be successfully estimated The birefringence tends to be 1/2 through 1/3 of that in the visible region. However, it is cleared that the birefringence is still large enough and the transmittance is fairly well for all measured materials.Coplanar wave guide (CPW) is combined with the ITO glass to make the planar wave guide type test cell For the goal of this project, we need a planar structure to utilize the optical measurement techniques Since the CPW has all electrodes on the same side of the substrate, it is easy to make a liquid crystal cell with the conventional planar structure. The floating electrode structure makes it possible to drive the liquid crystal cell by only applying the voltage to the CPW, and there is no deed to connect any wire to the upper substrate. In this stage, phase shifting can be observed up to the 15GHz, and the shifting vale is about 20 degrees at 15GHz with only the 1cm propagation length of the liquid crystal materil.Optical testing system is constructed for the very high sensitive optical measurements by using the microscopic instruments and Lock-in amplifier. 'Ib check the measurements system, electro-optic effects of the conventional liquid crystal cells are measured for alternative voltage application. Optical modulation can be observed up to 10kHz both for the f-mode and 2f-mode measurements. Unfortunately, we can not detect the modulation effects for the MMW, yet, because some unexpected problems. It becomes clear that the biggest problem is the CPW itself but not the liquid crystal materials. We are now working for the next phase.

本文提出了一种利用v波段和W波段矩形波导对液晶材料在毫米波区域的折射率进行估算的新方法，可以成功估算出液晶材料在毫米波区域（50GHz-110GHz）的复折射率，双折射率趋向于可见光区域的1/2 ~ 1/3。然而，可以明确的是，双折射仍然足够大，透射率对所有被测材料都相当好。共面波导（CPW）与ITO玻璃结合制成平面波导型测试槽。为了实现本课题的目标，我们需要一种平面结构来利用光学测量技术。由于共面波导的所有电极都在衬底的同一侧，因此采用传统的平面结构制作液晶槽很容易。浮动电极结构使得通过仅对CPW施加电压来驱动液晶电池成为可能，并且没有将任何导线连接到上部衬底的行为。在这一阶段，在15GHz范围内可以观测到相移，在15GHz范围内的移值约为20度，而液晶材料的传播长度只有1cm。采用显微仪器和锁相放大器，构建了高灵敏度光学测量系统。在检查测量系统时，测量了常规液晶电池在交变电压下的电光效应。对于f模式和2f模式测量，可以观察到高达10kHz的光调制。不幸的是，由于一些意想不到的问题，我们还不能检测到毫米波的调制效应。很明显，最大的问题是CPW本身，而不是液晶材料。我们现在正在为下一阶段的工作而努力。

项目成果

W-バンド矩形導波管を用いたネマティック液晶材料の測定

使用W波段矩形波导测量向列液晶材料

• 发表时间: 2005
• 期刊: 2005年日本液晶学会討論会 (発表予定)
• 作者: 齋藤;本間;能勢
• 通讯作者: 能勢

CPW導波路とITOガラスを組み合わせたセル構造のミリ波伝搬特性

CPW波导与ITO玻璃结合的单元结构的毫米波传播特性

• 发表时间: 2005
• 期刊: 平成16年度電気関係学会東北支部連合大会 1D5
• 作者: 柳瀬俊之;本間道則;能勢敏明
• 通讯作者: 能勢敏明

Determination of the Insertion Loss and Refractive Index anisotropy in Nematic Liquid Crystals Using a V-band Waveguide Transmission Cell

使用 V 波段波导传输池测定向列液晶中的插入损耗和折射率各向异性

• 发表时间: 2004
• 期刊: Molecular Crystals & Liquid Crystals 409
• 作者: 柳瀬俊之;本間道則;能勢敏明;Toshiaki Nose et al.
• 通讯作者: Toshiaki Nose et al.

Refractive Index Determination of the Nematic Liquid Crystal Materials by Using the Simple Measurement System in the Millimeter Wave Region

毫米波区简易测量系统测定向列液晶材料的折射率

• 发表时间: 2003
• 期刊: 11th International Conference on THz Electronics P1-36
• 作者: 柳瀬俊之;本間道則;能勢敏明;Toshiaki Nose et al.;Toshiaki Nose et al.;Toshiaki Nose et al.
• 通讯作者: Toshiaki Nose et al.

Toshiaki Nose et al.: "Refractive Index Determination of the Nematic Liquid Crystal Materials"11th Int.Conf.on Terahertz Electronics Technical Digest. P1-36. 84 (2003)

Toshiaki Nose 等人：“向列液晶材料的折射率测定”第 11 届 Int.Conf.on 太赫兹电子技术文摘。