扭曲向列相液晶太赫兹相位调制器特性研究

高芮; 乌日娜; 宋云鹤; 卢佳琦; 岱钦

doi:10.37188/CJLCD.2020-0258

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扭曲向列相液晶太赫兹相位调制器特性研究

器件物理及器件制备技术 | 更新时间：2021-03-23

- 扭曲向列相液晶太赫兹相位调制器特性研究
- Characteristics of twisted nematic liquid crystal terahertz phase modulator
- 液晶与显示 2021年36卷第3期页码：379-388
- 作者机构：
  
  沈阳理工大学理学院, 辽宁沈阳 110159
- 作者简介：
  
  [ "高芮(1997-), 女, 辽宁沈阳人, 硕士研究生, 2019年于沈阳理工大学获得学士学位, 主要从事液晶物理与器件方向的研究。E-mail: freegaorui@163.com" ]
  [ "岱钦(1977-),男,内蒙古通辽人,博士,教授,2007年于中国科学院长春光学精密机械与物理研究所获得博士学位,主要从事激光技术及应用方面的研究。E-mail:daiqin2003@126.com" ]
- 基金信息：
  
  国家自然科学基金(61705145);辽宁省高等学校创新人才支持计划(LR2016079);辽宁省自然科学基金项目(20180550330)
- DOI：10.37188/CJLCD.2020-0258
  中图分类号： O753.2;TP391
- 收稿日期：2020-09-29，
  
  录用日期：2020-10-23，
  
  纸质出版日期：2021-03
- 稿件说明：
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高芮, 乌日娜, 宋云鹤, 等. 扭曲向列相液晶太赫兹相位调制器特性研究[J]. 液晶与显示, 2021,36(3):379-388.

Rui GAO, Ri-na WU, Yun-he SONG, et al. Characteristics of twisted nematic liquid crystal terahertz phase modulator[J]. Chinese journal of liquid crystals and displays, 2021, 36(3): 379-388.
高芮, 乌日娜, 宋云鹤, 等. 扭曲向列相液晶太赫兹相位调制器特性研究[J]. 液晶与显示, 2021,36(3):379-388. DOI： 10.37188/CJLCD.2020-0258.

Rui GAO, Ri-na WU, Yun-he SONG, et al. Characteristics of twisted nematic liquid crystal terahertz phase modulator[J]. Chinese journal of liquid crystals and displays, 2021, 36(3): 379-388. DOI： 10.37188/CJLCD.2020-0258.

摘要

设计了扭曲向列相液晶太赫兹相位调制器，利用琼斯矩阵模拟分析了不同扭曲角30°、45°、90°对相位调制特性的影响。得出扭曲角越小其相位延迟量越高，并且对光的利用率越高。进一步分析电压效应，结果表明同一频率下加大电压可使透过率增大，相位延迟量减小。当扭曲角为30°，选择液晶材料为LC1825，液晶盒厚度为250 μm设计了透射型相位调制器，在1.2 THz频率处获得126°的相位延迟。为提高相位调制量设计了结构参数与透射型相同的反射型太赫兹相位调制器，在1.2 THz下得到相位延迟量为270°，因反射型结构较透射型增加了一倍的有效光程，相位调制量大幅提高。

Abstract

A terahertz phase modulator based on twisted nematic liquid crystal is designed

and the influences of twist angles of 30°

45°

and 90° on the phase modulation characteristics are analyzed using Jones matrix simulation. The results show that a smaller twist angle leads to the higher phase retardation and larger light utilization efficiency. In addition

with the increase of the voltage at the same frequency

the transmittance increases and the phase retardation decreases. When LC1825 liquid crystal with a twist angle of 30° is injected into a liquid crystal cell with a thickness of 250 μm

the transmission-based terahertz phase modulator is built. The phase retardation of 126° is obtained at a frequency of 1.2 THz. In order to maximize the phase modulation

a reflection-based terahertz phase modulator is also structured

which has similar structural parameters as the transmission-based terahertz phase modulator. As a result

the phase retardation reaches 270° at 1.2 THz

which is much larger than the transmission-based one due to the double effective optical length.

关键词

Keywords

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