低损耗高带宽金属光子晶体弯波导的设计  

Design of Low-loss and Wide-band Metallic Photonic Crystal Bend Waveguides

作　　者：杨波[1,2] 梁静秋[1] 梁中翥[1] 崔乃迪[1,2] 周建伟[1,2] 王维彪[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033 [2]中国科学院研究生院,北京100039

出　　处：《红外》2011年第7期17-22,共6页Infrared

基　　金：国家自然科学基金项目(60877031)

摘　　要：设计了一种采用金属材料的二维光子晶体波导。针对金属的色散特性,运用时域有限差分方法对3种二维结构的90°转弯波导的TM波传播特性进行了研究。给出了在合适的填充率下,转弯效率随周期变化的曲线。最后对其中较优的一种结构作了进一步优化,使其3dB时的带宽达到了99nm,目标波长处的转弯效率达到了98.2%。该结构的主要参数为:晶格常数α=1.190μm,金属柱直径R=0.809μm。A two-dimensional photonic crystal waveguide using metal is designed.The transmission characteristics of TM wave in three kinds of two-dimensional 90°bend waveguides are investigated by using the finite difference time domain（FDTD）.The curves of transmission efficiency changed with the period at an appropriate filling factor are given.Finally,the best structure among the waveguides is further optimized to have a bandwidth of 99 nm at 3 dB and a transmission efficiency of 98.2%at the target wavelength.The lattice constantαand the diameter of the metal pillar R in the structure are 1.190μm and 0.809μm respectively.

关 键 词：光子晶体 二维光子晶体波导 时域有限差分 金属 

分 类 号：O431.1[机械工程—光学工程] O734[理学—光学]