Infrared and Laser Engineering, Volume. 51, Issue 7, 20210511(2022)

Research on diffraction characteristics of liquid crystal polarization grating under oblique incidence

Qingquan Zheng1, Chunyang Wang1,2, Zishuo Wang2, Zeng Wang1, and Ding Kang1
Author Affiliations
  • 1College of Ordnance Science and Technology, Xi’an Technological University, Xi’an 710072, China
  • 2College of Electronic and Information Engineering, Changchun University of Science and Technology, Changchun 130022, China
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    Figures & Tables(12)
    (a) Molecular arrangement of liquid crystal without driving voltage; (b) Molecular arrangement of liquid crystal at driving voltage
    Distribution of liquid crystal molecular inclination angle at different voltages
    (a) Vertical incident beam model;(b) Beam oblique incident model
    Relation diagram between incident light vector and pointing vector
    Relationship between oblique incident angle, voltage and +1 diffraction efficiency
    (a) Vertical incident; (b) Oblique incident −10°; (c) Oblique incident +10°
    (a) +1 order diffraction efficiency; (b) 0 order diffraction efficiency
    Schematic diagram of the experimental device
    (a) Light spot pattern of +1 under vertical incidence; (b) Light spot pattern of +1 at 5° incidence; (c) Light spot pattern of +1 at 10° incidence
    Experimental verification
    • Table 1. Corresponding relationship between driving voltage and diffraction efficiency when the beam is incident at 0°-10°

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      Table 1. Corresponding relationship between driving voltage and diffraction efficiency when the beam is incident at 0°-10°

      Oblique incidence angle/(°) 012345678910
      Driving voltage/V2.22.22.22.22.22.22.12.12.12.02.0
      Diffraction efficiency99.3%99.1%98.9%98.5%98.1%97.4%96.5%95.5%94.3%92.9%91.4%
    • Table 2. Corresponding relationship between driving voltage and diffraction efficiency when the beam is incident at −10°-0°

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      Table 2. Corresponding relationship between driving voltage and diffraction efficiency when the beam is incident at −10°-0°

      Oblique incidence angle/(°)0−1−2−3−4−5−6−7−8−9−10
      Driving voltage/V2.22.22.22.22.22.32.32.32.32.42.4
      Diffraction efficiency99.3%99.1%98.8%98.3%97.5%96.5%95.3%93.7%91.9%89.8%87.1%
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    Qingquan Zheng, Chunyang Wang, Zishuo Wang, Zeng Wang, Ding Kang. Research on diffraction characteristics of liquid crystal polarization grating under oblique incidence[J]. Infrared and Laser Engineering, 2022, 51(7): 20210511

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    Paper Information

    Category: Optical devices

    Received: Dec. 5, 2021

    Accepted: --

    Published Online: Dec. 20, 2022

    The Author Email:

    DOI:10.3788/IRLA20210511

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