Phase modulation and response time characteristics of mid-infrared liquid crystal optical phase shifter

Rui WANG; Shuang-hong WU; Xiang-ru WANG; Xiao-xian HE; Ming-gang HU; Man LI; Sheng WANG; Ming-feng LI

doi:10.37188/CJLCD.2021-0164

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Phase modulation and response time characteristics of mid-infrared liquid crystal optical phase shifter

Device Physics and Device Preparation | 更新时间：2021-09-30

- Phase modulation and response time characteristics of mid-infrared liquid crystal optical phase shifter
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 10, Pages: 1369-1376(2021)
- 作者机构：
  
  1.电子科技大学光电科学与工程学院, 四川成都 611731
  2.西安近代化学研究所, 陕西西安 710065
  3.光电信息控制和安全技术重点实验室, 天津 300308
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(61871031);Fundamental Research Funds for the Central Universities(ZYGX2018J048);Sichuan Science and Technology Program(2020YFG0038)
- DOI：10.37188/CJLCD.2021-0164
  CLC： TN313.1
- Received：17 June 2021，
  
  Revised：02 August 2021，
  
  Published：2021-10
- 稿件说明：
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Rui WANG, Shuang-hong WU, Xiang-ru WANG, et al. Phase modulation and response time characteristics of mid-infrared liquid crystal optical phase shifter[J]. Chinese journal of liquid crystals and displays, 2021, 36(10): 1369-1376.
DOI：

Rui WANG, Shuang-hong WU, Xiang-ru WANG, et al. Phase modulation and response time characteristics of mid-infrared liquid crystal optical phase shifter[J]. Chinese journal of liquid crystals and displays, 2021, 36(10): 1369-1376. DOI： 10.37188/CJLCD.2021-0164.

摘要

本文研究制备了应用于中红外波段的液晶光学移相器，选用在中红外波段具有高透过率的蓝宝石作为基底，超薄氧化铟锡（ITO）薄膜作为透明电极，低吸收的中红外液晶作为介质。通过对液晶移相器施加电压，液晶分子在电光效应的作用下形成周期性的相位分布，从而实现对中红外激光的相位调制。本文研究制备的20 μm盒厚的液晶光学移相器在3.9 μm中红外激光照射下实现2.59 π的相位调制深度。切换电压的有效值从2.65 V变化到3.37 V时，响应时间为19 ms，能够达到中红外液晶光学移相器在高盒厚条件下的快速响应，最终能够实现液晶移相器在中红外波段的功能需求。

Abstract

The liquid crystal optical phase shifter applied in the mid-infrared band is prepared. The sapphire with high transmittance in the mid-infrared band is selected as the substrate

the ultra-thin indium tin oxide (ITO) film is used as the transparent electrode

and the mid-infrared liquid crystal with low absorption is selected as a medium. By applying voltage to the liquid crystal phase shifter

the liquid crystal molecules form a periodic phase distribution under the action of the electro-optic effect

thereby realizing the phase modulation of the mid-infrared laser. The 20 μm liquid crystal optical phase shifter prepared in this paper can achieve a phase modulation depth of 2.59 π under the irradiation of 3.9 μm mid-infrared laser. When the effective value of the switching voltage changes from 2.65 V to 3.37 V

the response time is 19 ms

which can achieve the fast response of the mid-infrared liquid crystal optical phase shifter under the condition of high cell thickness. Finally

the functional requirements of liquid crystal phase shifter in mid-infrared band can be realized.

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references

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Related Institution

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