液晶与显示2025，Vol.40Issue(6)：827-835,9.DOI:10.37188/CJLCD.2025-0064
基于图案化取向的液晶面内偏振分束器
In-plane polarization beam splitter based on patterned liquid crystal alignment
摘要
Abstract
Traditional optical beam splitters are limited by their fixed geometric structures and static working modes,making it challenging to meet the demands of dynamically reconfigurable photonic systems.To achieve polarization-controllable laser beam splitting,this study developed a programmable optical device based on liquid crystal gradient refractive index distribution.By establishing an equivalent refractive index model for liquid crystal planar structures,triangular-patterned liquid crystal cells with alignment angles of 30°,45°,60°,and 90° were fabricated using digital mask lithography via a digital micromirror device(DMD)chip,systematically constructing the mapping relationship between alignment angles and effective refractive indices.Experimental results revealed that as the alignment angle increased from 30° to 90°,the corresponding effective refractive index exhibited a monotonically increasing trend.Under horizontally linear polarized light incidence,the refraction angle of extraordinary light(e-light)showed a linear growth with increasing incident angle(15°～75°),confirming the applicability of Snell's law in liquid crystal media.During continuous polarization state modulation from horizontal to vertical orientations,the intensity ratio between e-light and ordinary light(o-light)demonstrated regular evolution,reaching a 1∶1 balanced state at a 46° polarization angle.Circularly polarized light excitation generated symmetrical dual beams,revealing the regulatory mechanism of birefringence phase difference on beam splitting behavior.This work realizes polarization-encoded beam splitting through gradient refractive index design in patterned liquid crystal devices,with its dynamically tunable characteristics providing both theoretical foundation and technical pathways for developing novel reconfigurable photonic devices.关键词
液晶光控取向/数字掩膜光刻/偏振分束/等效折射率/斯涅尔定律Key words
liquid crystal photoalignment/digital mask lithography/polarization beam splitting/effective refractive index/Snell's law引用本文复制引用
方欣宇,赵家辉,喻箫,贾奇麟,田璟琦,王子烨,杨吉丹,李炳祥..基于图案化取向的液晶面内偏振分束器[J].液晶与显示,2025,40(6):827-835,9.基金项目
国家重点研发计划(No.2022YFA1405000) （No.2022YFA1405000）
国家自然科学基金(No.62375141) （No.62375141）
江苏省基础研究计划重点项目(No.BK20243067)Supported by National Key Research and Development Program of China(No.2022YFA1405000) （No.BK20243067）
National Natural Science Foundation of China(No.62375141) （No.62375141）
Natural Science Foundation of Jiangsu Province,Major Project(No.BK20243067) （No.BK20243067）
