摘要
在单线缺陷结构中引入两个附加的相邻介质柱,构成一种新型的光子晶体耦合腔波导结构.通过平面波展开法对波导结构的的慢光特性进行了仿真分析,研究了平移线缺陷上下两侧介质柱,以及改变腔体的长度对器件色散特性和群速度的影响.结果表明:与平移缺陷上下两侧介质柱相比,通过改变腔体的长度,不仅可将光群速度低到0.03c(c为真空下的光速),而且器件的有效波长范围接近20nm.利用时域有限差分法得到波导结构的传输场分布图,研究波长的选取对入射激励光在光子晶体耦合腔波导中传输场的影响,发现结构参量优化后的光子晶体耦合腔波导仍然具有良好的传输特性.
A slow light photonic crystal coupled-cavity waveguide by introducing two additional holes into the single line-defect structure was proposed.The characteristics of slow light in the coupled-cavity waveguide were investigated with Plane Wave Expansion（PWE）method.Influences of the boundary rows shift and the coupled-cavity length on the dispersion and the group velocity of device were studied.Compared with the boundary rows shift method,the group velocity is reduced to 0.03c（c is the light velocity in vacuum）by modifying the coupled-cavity,meanwhile the effective wavelength range is close to20 nm.Finally,the transmission field distribution under different incident wavelength was analysed with Finite Difference Time Domain（FDTD）method.A good transmission character of the proposed structure is verified by researching transmission field distribution under different incident wavelength in photonic crystal coupled cavity waveguides.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2015年第2期175-178,共4页
Acta Photonica Sinica
基金
北京市属高等学校高层次人才引进与培养计划(No.CIT&TCD201304001)
北京市委组织部优秀人才项目(No.2012D005002000001)
北方工业大学科研人才提升计划项目(No.CCXZ201307)资助
关键词
慢光
群速度
带宽
光子晶体波导
耦合腔
Slow light
Photonic crystal waveguide
Group velocity
Bandwidth
Coupled cavity
