Chinese Journal of Liquid Crystals and Displays, Volume. 39, Issue 9, 1163(2024)
Modeling study of the effect of interdigital electrode structure on the effective refractive index modulation of liquid crystal clad optical waveguides
Fig. 1. （a）Interdigital electrode liquid crystal box model；（b）Schematic diagram of liquid crystal molecular deflection angle.
Fig. 2. Schematic diagram of the liquid crystal-cladded optical waveguide model based on interdigitated electrodes
Fig. 3. Potential distribution diagram under interdigital electrode arrangement
Fig. 4. （a）Liquid crystal molecule deflection angle with interfinger electrode arrangement at θpre=2°；（b）Variation of liquid crystal molecular deflection angle along the z-axis direction at different voltages.
Fig. 5. （a）Diagram of the effective refractive index of the optical waveguide at different z positions；（b）Deflection angle of liquid crystal molecules as a function of the thickness of the liquid crystal layer.
Fig. 6. （a）Liquid crystal molecule deflection angle diagram with interfinger electrode arrangement at θpre=88°；（b）Variation of liquid crystal molecular deflection angle along the z-axis direction at different voltages.
Fig. 7. （a）Diagram of the effective refractive index of the optical waveguide at different z positions；（b）Deflection angle of liquid crystal molecules as a function of the thickness of the liquid crystal layer.
Fig. 8. （a）Variation diagram of neff under different Δn；（b）Variation trend of Δneff-max with applied voltage；（c）Variation trend of Δneff-max with Δn.
Fig. 9. （a）Variation diagram of neff under different Δε；（b）Variation trend of Δneff-max with applied voltage；（c）Variation trend of Δneff-max with Δε.
Fig. 10. （a）Diagram of two-electrode liquid crystal cladding optical waveguide model；（b）Diagram of liquid crystal molecular deflection angle.
Fig. 11. Variation trend of Δneff-max value with applied voltage when the liquid crystal molecule is vertically oriented with interfinger-electrode and parallel oriented with bilateral electrode
Table 1. Material and structural parameters
View tableView in ArticleTable 1. Material and structural parameters
衬底层 芯层 取向层 液晶包层 材料参数 nclad=1.469 4 ncore=1.88 nali=1.5 no=1.485 8、ne=1.622 6
K11=14.1 pN、K22=8.5 pN、K33=15 pN、
ε⊥=2.8、ε∥=5.8
厚度/μm 2 0.64 0.03 2
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Huiru ZHAO, Zhihui DIAO, Quanquan MU, Weifang FAN, Ao CHEN, Yuqing WANG. Modeling study of the effect of interdigital electrode structure on the effective refractive index modulation of liquid crystal clad optical waveguides[J]. Chinese Journal of Liquid Crystals and Displays, 2024, 39(9): 1163
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Received: Jul. 9, 2024
Accepted: --
Published Online: Nov. 13, 2024
The Author Email: Zhihui DIAO (diaozh@ciomp.ac.cn), Quanquan MU (muquanquan@ciomp.ac.cn)
