.png){kind=icon}
.png){kind=icon}
Return
Fabrication of large area liquid crystal based waveguide gratings by polarization holographic projection
.png){kind=icon}
PRE
AI
T
Q
Y
Y
H
C
S
DOI：10.1016/j.optlastec.2026.116158.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
The polarized waveguide grating based on liquid crystal has broad application prospects in the fields of augmented reality, backlighting and other optoelectronic display, but high-quality large area photoalignment is the key bottleneck to limit its application. In this paper, the high-quality seamless large-area preparation has been achieved based on a polarization holographic projection system by using a step-by-step splicing method. The object light and reference light of the projection lens are limited to propagate within the aberration corrected holographic projection lens, and this conjugate projection mechanism solves the problem of blurred boundaries of the light orientation pattern caused by light propagation diffraction, and can achieve the light orientation of large-area waveguide gratings through splicing. The influence of lens numerical aperture on the seam width is studied, and an optical focusing scheme with wide range and submicron precision is proposed by using interference fringes formed by the reflected light of two beams on the image plane. A large area liquid crystal polarization grating (LCPG) with a size of 50 mm × 100 mm and a period of 500 nm was successfully fabricated. The results show that the common-path interference structure has high stability, no visible defects were observed after multiple exposures, the diffraction efficiency is up to 90 %, and the seam width is about 3 μm. These findings confirm the feasibility of this approach for the photoalignment preparation of large-area waveguide display gratings.
Keywords:
Polarization holographic projection
Liquid crystal polarization grating
Large area grating
Journal
O
IF:
5
Papers:
1.8K
Citations:
3.5W
Organization
Cited Papers