Study on the Application of Liquid Crystals to Millimeter-Wave Controlling Devices

液晶在毫米波控制器件中的应用研究

• 批准号: 12650334
• 负责人: SATO Susumu
• 金额: $ 2.62万
• 依托单位: AKITA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650334/
• 关键词: Nematic Liquid Crystal; Stack-Layered Liquid Crystal Device; Millimeter Wave Transmittance; Millimeter Wave Modulation Device; Millimeter Wave Control Device; Millimeter Wave Deflection Device; Millimeter Wave Focusing Lens; マネティック液晶デバイス; ミリ波帯変調デバ

1. The millimeter-wave (MMW) transmission properties of the nematic liquid crystal cells are measured using a Gunn diode, attenuator, horn-antenna and MMW detector, in which the operating frequencies are 50GHz and 90GHz band.2. The homogeneously aligned liquid crystal cells are prepared using nematic liquid crystal with a positive dielectric anisotropy, and their fundamental properties in the optical wavelength region are measured. Then the guideline for constructing the liquid crystal devices in the MMW region can be obtained.3. The voltage dependence of MMW transmission properties in the prepared liquid crystal cells are measured and the relationship between the polarization of MMW and molecular orientation properties is studied.4. Nematic liquid crystal cells with a grating-patterned electrode structure are fabricated and the MMW transmission properties are measured. The changes in the transmission induced by the reorientation of liquid crystal molecules by applying a voltage are ob … More served.5. Novel liquid crystal cells with a stuck-layered structure using metal substrates, which have a large effective path length, are proposed for the MMW region. Then the transmission properties are measured from 47 to 53 GHz and 86 to 94 GHz ranges by applying a voltage to the cell, and large transmission changes (〜50%) can be obtained.6. The finite-difference time-domain (FDTD) method is implemented to study the frequency dependence of the MMW transmission properties of the liquid crystal cell caused by the change in the dielectric permittivity of the liquid crystal layer.7. The liquid crystal prism and lens with a stack-layered structure are prepared using wedge-shaped and lens shaped metal substrates. The MMW deflection and focusing properties are measured, and the changes in the deflection angle and focusing length can be obtained. These effects are also studied by the FDTD method, and the experimental results are consistent with those estimated by the FDTD method.8. The results are examined and the research work is summarized. Less

1. 采用Gunn二极管、衰减器、喇叭天线和毫米波探测器，在50GHz和90GHz频段工作，测量了向列型液晶单元的毫米波传输特性。采用正介电各向异性的向列液晶制备了均匀排列的液晶电池，并测量了其在波长区域的基本性质。从而为在毫米波区域构建液晶器件提供了指导。测量了所制备液晶电池中毫米波传输特性的电压依赖性，并研究了毫米波极化与分子取向特性之间的关系。制作了具有光栅图案电极结构的向列液晶电池，并测量了其毫米波透射特性。通过施加电压使液晶分子重定向所引起的透射率的变化被广泛地研究。提出了一种新型的基于金属衬底的卡层结构液晶电池，该电池具有较大的有效路径长度，适用于毫米波区域。然后，在47 ~ 53 GHz和86 ~ 94 GHz范围内，通过对电池施加电压测量传输特性，可以获得较大的传输变化（~ 50%）。采用时域有限差分（FDTD）方法研究了液晶层介电常数变化对液晶电池毫米波传输特性的频率依赖性。采用楔形和透镜形金属基板制备了具有堆叠层状结构的液晶棱镜和透镜。测量了毫米波的偏转和聚焦特性，得到了偏转角和聚焦长度的变化规律。用时域有限差分法研究了这些影响，实验结果与用时域有限差分法估计的结果一致。对研究结果进行了检验，并对研究工作进行了总结。少

项目成果

M.Honma: "Enhancement of Numerical Aperture in Liquid Crystal Microlenses by Using a Stacked Electrode Structure"Japanese Journal of Applied Physics. Vol.39,No.8. 4799-4802 (2000)

M.Honma：“使用堆叠电极结构增强液晶微透镜的数值孔径”日本应用物理学杂志。

M. Tanaka: "Liquid Crystal Millimeter-Wave Controlling Devices using Stack-Layered Structure (in Japanese)"2000 Japanese Liquid Crystal Society Meeting. 3D07. 519-520 (2000)

M. Tanaka：“使用叠层结构的液晶毫米波控制装置（日语）”2000 年日本液晶学会会议。

M. Tanaka: "Focusing Properties of Liquid Crystal Lens Cells withStack-Layered Structure in the Millimeter-Wave Region"IEEE Microwave and Wireless Components Letters. (in press).

M. Tanaka：“毫米波区域中具有叠层结构的液晶透镜单元的聚焦特性”IEEE 微波和无线元件快报。

1.Tanaka: "Application of Nematic Liquid Crystals to Quasi-Optical Millimeter-Wave Devices"Proceedings of SPIE. Vol.40,No.10B. L1123-L1125 (2001)

1.田中：“向列液晶在准光学毫米波器件中的应用”SPIE会议录。

佐藤進: "液晶光学デバイスの研究動向"光学. Vol.30,No.1. 2-10 (2001)

Susumu Sato：“液晶光学器件的研究趋势”，第 30 卷，第 1 期（2001 年）。