二维正方晶格光子晶体三光波导方向耦合器  

Three Waveguides Directional Coupler Based on Two Dimensional Square Lattice Photonic Crystal

作　　者：苏康[1] 王梓名[1] 刘建军[1] 

机构地区：[1]湖南大学物理与微电子科学学院,湖南长沙410082

出　　处：《光学学报》2016年第3期202-207,共6页Acta Optica Sinica

基　　金：国家自然科学基金(61405058)

摘　　要：光子晶体是以介电常数呈周期性排布且在光波长量级构建的人工微结构,利用其具有光子禁带这一特性可实现对光子的控制。引入线缺陷可形成光子晶体波导。以1.55μm的TE偏振光作为光源,用时域有限差分法计算并分析了二维正方晶格光子晶体三光波导方向耦合器在不同波导间距下的耦合长度及耦合效率分别与介质柱折射率和介质柱半径的变化关系。研究结果为1.55μm耦合器的结构设计及制备提供一定的理论指导。Photonic crystal is an artificial microstructure constructed in optical wavelength scale, whose dielectric constant arrangement is a periodic configuration. Because it possesses photonic bandgap, it can be used to control photons. Photonic crystal waveguide can be formed by introducing line defect. Given 1.55 μm TE polarized light as source and under different waveguide separations, the relationship between coupling length, coupling efficiency and refractive index of dielectric cylinders, radius of dielectric cylinders are calculated and analyzed by finitedifference time-domain method, respectively. These research results will provide a theoretical guidance for the structure design and fabricating of the 1.55 μm coupler.

关 键 词：光学器件 光子晶体 耦合器 时域有限差分法 耦合长度 耦合效率 

分 类 号：O488[理学—固体物理]