Abstract As one of the basic components of integrated optics, optical waveguide with the characteristics of low loss and high integration has received more and more attention recently. In this paper we proposed a new optical waveguide structure with high transmission rate based on Lithium Niobate integrated two-dimensional (2D) photonic crystal. The structural modeling and band gap analysis to four kinds of two-dimensional photonic crystals with lithium niobate are carried out by using the plane wave expansion (PWE) method. Compared to the other three structures, the triangular lattice structure of the photonic crystal has a wider infrared band electromagnetic band gap. The dielectric column structure (a=697 nm and r/a=0.228) has a complete TE photonic band gap (PBG) of 1285 nm to 1768 nm, while the air holes column structure ( a=628 nm and r/a=0.351) has a complete TM PBG of 1372 to 1807 nm. The finite difference time domain (FDTD) method is used to simulate the transmission characteristics of the two structures with line defect. By adjusting and optimizing the line defect structure, the transmission rate of the curved waveguide of the two structures is increased by more than 90%, which is of great significance to the study of all-optical integrated networks.

中文翻译：

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铌酸锂集成光子晶体与波导多结构带隙传输特性

摘要 光波导作为集成光学的基本组成部分之一，具有低损耗、高集成度的特点，近年来受到越来越多的关注。在本文中，我们提出了一种基于铌酸锂集成二维（2D）光子晶体的高传输率新型光波导结构。采用平面波展开(PWE)方法对四种含铌酸锂的二维光子晶体进行结构建模和带隙分析。与其他三种结构相比，光子晶体的三角晶格结构具有更宽的红外波段电磁带隙。电介质柱结构（a=697 nm 和 r/a=0.228）具有 1285 nm 至 1768 nm 的完整 TE 光子带隙（PBG），而气孔柱结构（a=628 nm 和 r/a=0 . 351) 具有 1372 至 1807 nm 的完整 TM PBG。时域有限差分法(FDTD)用于模拟两种带线缺陷结构的传输特性。通过调整优化线缺陷结构，两种结构的弯曲波导的传输率提高了90%以上，对全光集成网络的研究具有重要意义。