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1、光子晶體波導(dǎo)慢光特性研究第31卷??第1期2011年1月光？？學(xué)？？學(xué)？?報(bào)Vol.31,No.lJanuary,2011曲連杰??楊躍德??黃永箴（中國(guó)科學(xué)院半導(dǎo)體研究所集成光電子學(xué)國(guó)家重點(diǎn)聯(lián)合實(shí)驗(yàn)室，北京100083）摘要??基于二維三角晶格空氣孔光子晶體，通過(guò)在光子晶體單線(xiàn)缺陷波導(dǎo)兩側(cè)引入不同的耦合腔,設(shè)計(jì)了慢光特性較好的波導(dǎo)結(jié)構(gòu)。利用平面波展開(kāi)法計(jì)算波導(dǎo)的色散曲線(xiàn),并分析慢光模式的群速度和群速度色散特性。耦合腔釆用單缺陷腔時(shí)，適當(dāng)調(diào)節(jié)波導(dǎo)寬度可以獲得在零色散點(diǎn)群速度為0.0128c的慢光模式,對(duì)應(yīng)在1.55??m波長(zhǎng)處的帶寬為409G
2、HZo耦合腔采用長(zhǎng)軸與波導(dǎo)方向呈60??的雙缺陷腔，在超原胞大小為4a9b（a,b分別為光子晶體在x,y方向的周期）時(shí)，通過(guò)調(diào)整波導(dǎo)寬度，可以獲得在零色散點(diǎn)群速度為0.0070c的慢光模式,對(duì)應(yīng)在1.55??m波長(zhǎng)處的帶寬為226GHZo進(jìn)一步增大沿波導(dǎo)方向上雙缺陷腔之間的距離，可以獲得在零色散點(diǎn)群速度為0.0011c的慢光模式。同時(shí)可以根據(jù)具體情況選擇合適的波導(dǎo)寬度參數(shù),設(shè)計(jì)滿(mǎn)足不同要求的慢光波導(dǎo)結(jié)構(gòu)。關(guān)鍵詞??光通信;光子晶體波導(dǎo);平面波展開(kāi)法;慢光;零色散點(diǎn)中圖分類(lèi)號(hào)??TN929.11??????文獻(xiàn)標(biāo)識(shí)碼??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？???言光子晶體有很多獨(dú)特的性質(zhì)，可以應(yīng)用于各
