氮化镓/掺偶氮苯聚合物光栅耦合器特性研究  

Characteristics of gallium nitride/azobenzene polymer grating coupler

作　　者：班文君 朱冰[1,2] BAN Wenjun;ZHU Bing(Department of Electronic Engineering and Information Science,University of Sciences and Technology of China,Hefei 230027,China;Key Laboratory of Electro magnetic Space Information,Chinese Academy of Sciences,Hefei 230027,China)

机构地区：[1]中国科学技术大学电子工程与信息科学系,安徽合肥230027 [2]中国科学院电磁空间信息重点实验室,安徽合肥230027

出　　处：《量子电子学报》2019年第4期506-512,共7页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金重点项目,61377022~~

摘　　要：提出一种氮化镓与掺偶氮苯聚合物复合材料集成光波导光栅耦合器,并通过仿真计算分析了这种器件的特性。用氮化镓铝衬底上对称的双氮化镓脊形光波导构成集成光波导定向耦合器,涂覆掺偶氮苯聚甲基丙烯酸甲酯聚合物作为包层.利用掺偶氮苯聚合物的光敏特性,在两脊形波导间区域通过周期性光照制作布拉格光栅。利用耦合模理论分析了这种光栅耦合器中各模式间的耦合关系,确定了各模式的耦合模方程,仿真计算了这种光栅耦合器各端口的输出特性,包括各模式的幅度随着传输距离的变化,以及各端口输出的幅度变化关系。在此基础上进一步分析了多周期耦合光栅耦合器的频谱特性,为集成光路中实现复杂频谱信号的操作提供了一种新的实现方案。An integrated optical waveguide grating coupler using gallium nitride and azobenzene polymer composites is designed,and the characteristics of the device are analyzed by simulation.An integrated optical waveguide directional coupler is constructed using two symmetric gallium nitride ridge optical waveguides on a gallium nitride aluminum substrate,and an azobenzene-containing polymethyl methacrylate polymer is coated as a cladding.Based on the photosensitive properties of the azobenzene polymer,a Bragg grating is fabricated by periodic illumination in the region between the two ridge waveguides.The coupling between the modes in the grating coupler is analyzed by the coupled mode theory.Using the coupled mode equations,the output characteristics of each port of the grating coupler are simulated,including the output of each mode as a function of the transmission distance and the amplitude variation under different coupling period conditions.The spectral characteristics of the multi-coupling-period grating coupler are further analyzed,which provides a new scheme for realizing the operation of complex spectrum signal in integrated optical path.

关 键 词：波导光学 光栅耦合器 耦合模理论 氮化镓 偶氮苯聚合物 

分 类 号：TN25[电子电信—物理电子学]