MA Chenwen; CHEN Fangfang; ZHENG Jihong

doi:10.7498/aps.74.20241794

Abstract

Photo-oriented liquid crystal technology utilizes polarized light illumination to achieve the directional alignment of liquid crystal molecules. This technology can be developed into polarization volume gratings (PVGs), which possess polarization and volume holographic selectivity characteristics, and also have a broad application prospect as an optical coupling element in optical waveguides and for pupil expansion output. This paper reports on the fabrication of a liquid crystal polarization volume holographic cylindrical lens (PVLS) with a beam diameter of 2 cm by using photo-oriented technology combined with a polarization off-axis holographic optical path. During the experiment, the exposure angle can be controlled to achieve the desired grating period variation range, enabling the diffraction angles of red, green, and blue light incident on different grating periods to be the same. The experimental results show that within the grating period variation range from 1721.2 to 5346.5 nm, when the red, the green, and the blue light are incident on grating with periods of 3147 nm, 2649.1 nm, and 2275.6 nm respectively, the measured diffraction angles are all 11.59°, with an error between the actual and theoretical diffraction angles within ±0.5°; under 532-nm right-handed circularly polarized light, the diffraction efficiency for 18 normal incidence reaches 90.6%, and the diffraction efficiency for oblique incidence satisfying the Bragg condition is 84.4%; simultaneously, beam expansion in one-dimensional direction is achieved, preliminarily verifying the feasibility of PVLS application in the field of color waveguides.

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Corresponding author: ZHENG Jihong, jihongzheng@usst.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 62475158).

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5CB R5011

反射红色 97.79% 2.21%

反射绿色 97.37% 2.63%

反射蓝色 96.94% 3.06%

DownLoad: CSV

x/cm 光栅周期/nm 衍射角/(°)

0.9 1739.4 21.31
0.5 2044.7 18
0 2655.9 13.77
–0.5 3567.5 10.2
–0.9 5304.5 6.84

DownLoad: CSV

x/cm 光栅周期/nm 衍射角/(°)

0.9 1723.5 15.38
0.5 2081.9 12.68
0 2651.1 9.93
–0.5 3684.5 7.13
–0.9 5395.9 4.86

DownLoad: CSV

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Vol. 74, Issue 7 - 2025-04-05

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Corresponding author: ZHENG Jihong, jihongzheng@usst.edu.cn

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	5CB	R5011
反射红色	97.79%	2.21%
反射绿色	97.37%	2.63%
反射蓝色	96.94%	3.06%

x/cm	光栅周期/nm	衍射角/(°)
0.9	1739.4	21.31
0.5	2044.7	18
0	2655.9	13.77
–0.5	3567.5	10.2
–0.9	5304.5	6.84

x/cm	光栅周期/nm	衍射角/(°)
0.9	1723.5	15.38
0.5	2081.9	12.68
0	2651.1	9.93
–0.5	3684.5	7.13
–0.9	5395.9	4.86

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Corresponding author: ZHENG Jihong, jihongzheng@usst.edu.cn

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