大角度偏振无关硅膜光子晶体宽带滤波器  

Large-Angle Polarization-Independent Broadband Filters Based on Silicon Photonic Crystal Slabs

作　　者：陈志勇[1] 郝小龙[1] 郑彦敏[1] 陈曦曜[2] 蒋俊贞[1] 邱怡申[1] 强则煊[1] 

机构地区：[1]福建师范大学激光与光电子技术研究所,福建省光子技术重点实验室,医学光电科学与技术教育部重点实验室,福建福州350007 [2]闽江学院物理学与电子信息工程系,福建福州350108

出　　处：《中国激光》2013年第3期117-122,共6页Chinese Journal of Lasers

基　　金：福建省科技厅基金(2012J01253)资助课题

摘　　要：提出一种基于超低折射率如聚甲基丙烯酸甲酯(PMMA)为衬底的大角度偏振无关蜂窝状空气孔型的二维硅基光子晶体宽带滤波器。结合色散关系和严格耦合波理论确定宽带工作区,分析了入射光垂直入射时硅膜厚度及空气孔径对器件性能的影响,得出适合于1.55μm通信波长的一组优化参数,讨论了非垂直入射及偏振对器件性能的影响。结果表明,垂直入射时,可以得到透射率大于98%、110nm以上的带宽;非垂直入射时,两偏振的共振带宽将随角度增加而减小,在入射角为18°时,透射率大于98%的共同带宽还能覆盖光通信的整个C波段(1525～1560nm)。A large-angle polarization-independent broadband guided-mode-resonant filter is proposed based on twodimensional hon4ey-comb silicon photonic crystal slab with ultralow refractive-index substrate material like polymethyl methacry late （PMMA） The broadband operating range is determined firstly based on the dispersion relationship and rigorous coupled wave analysis （RCWA）. Then the impact of silicon membrane thickness and air hole size on the performance of proposed device under surface normal incidence is investigated and an optimal set of physical parameters for 1.55 m communication window is obtained correspondingly. Its performance affected by oblique incidence and polarization is also analyzed. It shows that broad bandwidth over 110 nm can be obtained with greater than 98 % normalized transmittance under surface normal incidence. The common bandwidth of two polarizations will reduce with the increase of incident angle. But it can still cover the whole C-band window （from 1525 nm to 1560 nm） with over 98 % normalized transmittance when the angle reaches 18.

关 键 词：光通信 光子晶体 宽带滤波器 导模共振 严格耦合波理论 

分 类 号：TN929.11[电子电信—通信与信息系统]