一种新型高透射率高品质因子光子晶体耦合腔波导结构-发光学报.PDF

第35卷摇 第7期 发摇 光摇 学摇 报 Vol郾35 No郾7 2014年7月 CHINESEJOURNAL OF LUMINESCENCE July,2014 文章编号:1000鄄7032(2014)07鄄0872鄄06 一种新型高透射率高品质因子光子晶体耦合腔波导结构 * 刘摇 杰,沈宏君 , 吕冬妮 (宁夏大学 物理电气信息学院,宁夏 银川摇 750021) 摘要:提出了一种在二维三角晶格光子晶体线缺陷波导中放置椭圆空气孔的耦合腔波导结构。 基于平面波 展开法,利用MPB对线缺陷波导的能带结构进行了计算并给出能带图。 基于时域有限差分法(FDTD),利用 MEEP对椭圆空气孔在波导中的排列方式、数量、尺寸进行优化设计,并对频率位于微腔共振频率处的光波在 耦合腔波导结构中的品质因子和传输特性进行研究与比较,给出了电场分布图。 仿真结果表明,当椭圆空气 孔的长轴方向纵向排列时,相应的微腔共振频率在光子禁带内可获得90%以上的透射率,对应的品质因子Q 4 7 可达10 量级;选择合适的参数,获得的Q可高达10 量级,对应共振频率的透射率仍在60%以上。 关摇 键摇 词:二维光子晶体;时域有限差分;品质因子;透射率 中图分类号:O431.1摇 摇 摇 文献标识码:A摇 摇 摇 DOI:10.3788/ fgx0872 A Novel Photonic Crystal Coupled Cavity Waveguide with High Q Factor and Transmission Efficiency * LIUJie,SHEN Hong鄄jun ,LYU Dong鄄ni (School of Physics and Electrical Information,Ningxia University,Yinchuan750021,China) *Corresponding Author,E鄄mail:shenhongj2004@126.com Abstract:A novel coupled鄄cavity waveguide based on two鄄dimensional triangular lattice photonic crystalswas proposed. This structure was composed of the line鄄defect waveguides,resonant micro鄄 cavity,and ellipse鄄holeswhich are located between line鄄defect waveguide and resonant micro鄄cavity. The band structure of line鄄defect waveguide was simulated by the method of the plane鄄wave expan鄄 sion. Thetransmissioncharacteristicsandqualityfactorofthecoupled鄄cavitywaveguideswereinves鄄 tigated by the finite鄄difference time鄄domain (FDTD) method. By optimizing the structural parame鄄 ters such as amount,si