液晶与显示2024，Vol.39Issue(6)：725-734,10.DOI:10.37188/CJLCD.2024-0107
基于液晶包层平板光波导的偏振转换器设计
Design of polarization converter based on liquid crystal-clad slab waveguide
摘要
Abstract
The dynamic tunable polarization converter based on liquid crystals,which boastes large modulation amplitude and low power consumption,holds significant research interest in on-chip integrated systems.However,existing liquid crystal polarization converters encounter substantial transmission losses and difficulties in orienting the liquid crystal molecules.In response,this paper introduces a polarization converter based on a liquid crystal-clad slab waveguide.Initially,leveraging the anisotropy of liquid crystals and the four-layer waveguide theory,a polarization conversion analysis model that satisfied the physical characteristics of the liquid crystal-clad slab waveguide was developed.This model elucidated the internal mechanism of polarization conversion as mode coupling within the waveguide,induced by field-driven rotation of liquid crystal molecules.Subsequently,by precisely solving for the propagation constants and optical field distributions of the waveguide modes under coupled conditions,a polarization conversion analysis method suitable for liquid crystal-clad slab waveguides was proposed.This method summarized the theoretical formulas for polarization conversion efficiency and minimum conversion length,and elucidated the influence of mode coupling on polarization conversion efficiency.Finally,by comprehensively optimizing the parameters of each waveguide layer,a set of device parameters capable of achieving high polarization conversion efficiency was derived.The impact of deviations in the core layer thickness,orientation layer thickness,and electrode length on conversion efficiency was analyzed.The results indicate that the designed liquid crystal-clad slab waveguide polarization converter can achieve continuously adjustable conversion efficiency from 0%to 99.98%with a change in driving voltage of 0.2 V.关键词
液晶/光波导/偏振转换器Key words
liquid crystal/optical waveguide/polarization converter分类
数理科学引用本文复制引用
蔚云慧,毕泽坤,刁志辉,彭增辉,刘永刚,王启东,穆全全..基于液晶包层平板光波导的偏振转换器设计[J].液晶与显示,2024,39(6):725-734,10.基金项目
长春市国家重点实验室(学科类)重大专项(No.23GZZ07) （学科类）
国家重点研发计划(No.2021YFB3600300)Supported by Changchun State Key Laboratory Major Project(No.23GZZ07) （No.2021YFB3600300）
National Key R&D Program of China(No.2021YFB3600300) （No.2021YFB3600300）
