波导基本结构对光子晶体耦合腔光波导慢光特性的影响  被引量:7

Effect of Waveguide Basic Structure on Slow Light in Phtonic Crystal Coupled Resonator Optical Waveguide

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作  者:李长红[1] 田慧平[2] 鲁辉[2] 纪越峰[2] 

机构地区:[1]青岛大学自动化工程学院,山东青岛266071 [2]北京邮电大学光子信息与光通信教育部重点实验室,北京100876

出  处:《光学学报》2010年第7期2108-2115,共8页Acta Optica Sinica

基  金:国家863计划(2007AA01Z247;2009AA01Z214);国家973计划(2007CB310705);国家自然科学基金(60707001;60711140087);新世纪人才支持项目(NCET-07-0110);教育部"长江学者和创新团队发展计划"(IRT0609);科技部国际合作计划(2006DFA11040)资助课题

摘  要:研究了二维光子晶体耦合腔波导的结构对慢光特性的影响,发现微腔间的距离n、填充因子r/a和缺陷柱的尺寸rd是影响光子晶体禁带中慢光导模传输特性的重要参数。随着缺陷微腔间距离的增加,导模群速度vg急剧减小;当填充因子和缺陷柱尺寸增加时,导模向低频方向移动,同时,导模群速度降低;填充因子和缺陷柱尺寸降到一定数值后,vg达到最小值,此后,当r和rd分别超出其特定值继续增大,导模群速度反而增大。取微腔之间介质柱个数为6,普通介质柱尺寸为r=0.22a,a为光子晶体晶格常数,缺陷柱尺寸为rd=0.12a,得到导模群速度最大值vgmax<1.93×10-3c,带边处vg<10-4c(c为光速)。这一结果显示,通过基本结构设计可以实现对光子晶体耦合腔光波导中慢光的有效控制,这将为基于光子晶体功能器件的设计和应用提供有效的支持。Structure parameters of the slow light in the photonic crystal coupled resonator optical waveguide have been investigated.It is found that cavity distance n,filling factor r/a and size of the defect rod rd are the most significant factors affecting the transmission properties of the slow light guided mode in the photonic band gap.With the increase of cavity distance,the group velocity vg of guided mode decreases rapidly.When filling factor and defect rod size increase,the guided mode shifts towards a lower frequency with vg decreasing simultaneously.When the filling factor and defect rod size increase to a respective certain value,vg reaches a bottom value.And as r and rd exceeds the above certain value,group velocity of the guided mode will increase.By choosing appropriate structure parametersm of n=6,r=0.22a,rd=0.12a,it is obtained that the maximum value of guided mode vgmax=1.93×10-3 c and vg10-4 c at the band edge in the photonic crystal coupled resonator optical waveguide.These results indicate that effective control over the slow light in the photonic crystal coupled resonator optical waveguide could be realized through basic structure design,which may offers significant support for design and application of functional devices based on photonic crystals.

关 键 词:光子晶体 耦合腔波导 慢光 超胞 导模 

分 类 号:O734[理学—晶体学]

 

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