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通过对二维正方晶格光子晶体线缺陷模色散曲线慢光特性的研究,利用外电场对液晶分予取向的调控作用,在填充液晶的正方晶格波导的马赫-曾德尔干涉仪结构中实现了开关和强度调制等功能.利用平面波展开法计算了光子晶体波导的线缺陷模,分析了液晶折射率的变化对缺陷模的影响.计算表明,液晶折射率仅改变了0.1,线缺陷模有效折射率改变达0.168,该特性可以更为有效地实现对相位的控制,进而实现高消光比开关和强度调制功能,这种高效的相位调节器件在集成光系统中将有很好的应用前景.
By studying the slow-light characteristics of the mode dispersion curve of a two-dimensional square lattice photonic crystal, the effect of the external electric field on the orientation of the liquid crystal is implemented in a Mach-Zehnder interferometer structure filled with a liquid crystal square lattice waveguide Such as switching and intensity modulation, etc. The plane defect mode of photonic crystal waveguide is calculated by the plane wave expansion method, and the influence of the refractive index of liquid crystal on the defect mode is analyzed. The calculation shows that the refractive index of liquid crystal is only changed by 0.1, The refractive index changes up to 0.168. This feature can effectively control the phase and realize high extinction ratio switch and intensity modulation function. Such an efficient phase adjustment device will have a good application prospect in the integrated optical system.