中国物理B ›› 2016, Vol. 25 ›› Issue (9): 94218-094218.doi: 10.1088/1674-1056/25/9/094218

• SPECIAL TOPIC—Physical research in liquid crystal • 上一篇    下一篇

Asymmetric dynamic phase holographic grating in nematic liquid crystal

Chang-Yu Ren(任常愚), Hong-Xin Shi(石宏新), Yan-Bao Ai(艾延宝), Xiang-Bao Yin(尹向宝), Feng Wang(王丰), Hong-Wei Ding(丁红伟)   

  1. 1. School of Science, Heilongjiang University of Science and Technology, Harbin 150022, China;
    2. Electrization and Control Engineering School, Heilongjiang University of Science and Technology, Harbin 150022, China
  • 收稿日期:2016-05-27 出版日期:2016-09-05 发布日期:2016-09-05
  • 通讯作者: Chang-Yu Ren E-mail:renchangyu@126.comedu.cn,renchangyu@usth.edu.cn
  • 基金资助:
    Project supported by the Science and Technology Programs of the Educational Committee of Heilongjiang Province, China (Grant No. 12541730) and the National Natural Science Foundation of China (Grant No. 61405057).

Asymmetric dynamic phase holographic grating in nematic liquid crystal

Chang-Yu Ren(任常愚)1, Hong-Xin Shi(石宏新)1, Yan-Bao Ai(艾延宝)2, Xiang-Bao Yin(尹向宝)1, Feng Wang(王丰)1, Hong-Wei Ding(丁红伟)1   

  1. 1. School of Science, Heilongjiang University of Science and Technology, Harbin 150022, China;
    2. Electrization and Control Engineering School, Heilongjiang University of Science and Technology, Harbin 150022, China
  • Received:2016-05-27 Online:2016-09-05 Published:2016-09-05
  • Contact: Chang-Yu Ren E-mail:renchangyu@126.comedu.cn,renchangyu@usth.edu.cn
  • Supported by:
    Project supported by the Science and Technology Programs of the Educational Committee of Heilongjiang Province, China (Grant No. 12541730) and the National Natural Science Foundation of China (Grant No. 61405057).

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摘要： A new scheme for recording a dynamic phase grating with an asymmetric profile in C60-doped homeotropically aligned nematic liquid crystal (NLC) was presented. An oblique incidence beam was used to record the thin asymmetric dynamic phase holographic grating. The diffraction efficiency we achieved is more than 40%, exceeding the theoretical limit for symmetric profile gratings. Both facts can be explained by assuming that a grating with an asymmetric saw-tooth profile is formed in the NLC. Finally, physical mechanism and mathematical model for characterizing the asymmetric phase holographic grating were presented, based on the photo-refractive-like (PR-like) effect.

关键词: nematic liquid crystal, asymmetric phase grating, diffraction efficiency, photorefractive effect

Abstract: A new scheme for recording a dynamic phase grating with an asymmetric profile in C60-doped homeotropically aligned nematic liquid crystal (NLC) was presented. An oblique incidence beam was used to record the thin asymmetric dynamic phase holographic grating. The diffraction efficiency we achieved is more than 40%, exceeding the theoretical limit for symmetric profile gratings. Both facts can be explained by assuming that a grating with an asymmetric saw-tooth profile is formed in the NLC. Finally, physical mechanism and mathematical model for characterizing the asymmetric phase holographic grating were presented, based on the photo-refractive-like (PR-like) effect.

Key words: nematic liquid crystal, asymmetric phase grating, diffraction efficiency, photorefractive effect

中图分类号:  (Liquid crystals)

  • 42.70.Df
42.65.Hw (Phase conjugation; photorefractive and Kerr effects) 42.40.Eq (Holographic optical elements; holographic gratings) 42.40.Lx (Diffraction efficiency, resolution, and other hologram characteristics)