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1、光子晶体波导慢光特性研究第31卷??第1期2011年1月光??学??学??报Vol.31,No.lJanuary,2011曲连杰??杨跃德??黄永箴(中国科学院半导体研究所集成光电子学国家重点联合实验室,北京100083)摘要??基于二维三角晶格空气孔光子晶体,通过在光子晶体单线缺陷波导两侧引入不同的耦合腔,设计了慢光特性较好的波导结构。利用平面波展开法计算波导的色散曲线,并分析慢光模式的群速度和群速度色散特性。耦合腔釆用单缺陷腔时,适当调节波导宽度可以获得在零色散点群速度为0.0128c的慢光模式,对应在1.55??m波长处的带宽为409G
2、HZo耦合腔采用长轴与波导方向呈60??的双缺陷腔,在超原胞大小为4a9b(a,b分别为光子晶体在x,y方向的周期)时,通过调整波导宽度,可以获得在零色散点群速度为0.0070c的慢光模式,对应在1.55??m波长处的带宽为226GHZo进一步增大沿波导方向上双缺陷腔之间的距离,可以获得在零色散点群速度为0.0011c的慢光模式。同时可以根据具体情况选择合适的波导宽度参数,设计满足不同要求的慢光波导结构。关键词??光通信;光子晶体波导;平面波展开法;慢光;零色散点中图分类号??TN929.11??????文献标识码??A??????doi:1
3、0.3788/AOS201131.0113002Slow??LightCharacteristicsofPhotonicCrystalWaveguidesQuLianjie??YangYuede??HuangYongzhen(StateKeyLaboratoryonlntegratedOptoelectronics,lnstituteofSemiconductors,ChineseAcademyofSciences,Beijingl00083,China)Abstract??Basedontwo??dimensionaltriangularl
4、atticeair??holephotoniccrystal,akindofwaveguidestructurewithgoodslow??lightcharacteristicsisproposedbyinducingcoupled??cavityonbothsidesofthephotoniccrystalsingle??linedefectedwaveguides.Theenergy??bandstructure尼roupvelocityandgroup??velocitydispersioncharacteristicsofslow?
5、?lightmodeareanalyzedbyplanewaveexpansionmethod.Forthewaveguidestructureusingsingle??defectcavityascoupledcavity,thegroupvelocityof0.0128catthezero??dispersionpointwiththebandwidthof409GHzinthe1.55??mwavelengthcouldbeobtainedbyappropriatelyadjustingthewaveguidewidth.Asforth
6、ewaveguidestructureusingtwo??defectcavityascoupledcavitywiththesuper??cellof4a9b,thegroupvelocitycanreach0.0070catthezero??dispersionpointwiththebandwidthof226GHzinthel.55??mwavelengthbyadjustingthewaveguidewidth.Tofurtherincreasethedistancebetweenthetwo??defectcavities,the
7、slow??lightmodewithgroupvelocityof0.0011catthezero??dispersionpointcouldbeobtained.Besides,theslow??lightwaveguidecanmeetdifferentrequirementsbyselectingtheappropriatewidthofwaveguide・Keywords??opticalcommunications;photoniccrystalwaveguides;plane??waveexpansionmethod;slowl
8、ight;zero??dispersionpointOCIScodes??130.5296;060.45101??引????言光子晶体有很多独特的性质,可以应用于各