摘要
构造了形如（AB）N1（BA）N2的具有对称结构的一维三元光子晶体,并利用光子晶体的传输矩阵法进行了数值计算。发现这种对称结构的光子晶体透射谱中主禁带内存在极窄的单透射峰,与在这种对称结构的光子晶体中引入一定尺寸范围的缺陷层有相似的效果,并分析了这种光子晶体主禁带内的透射峰位置,λ起始位置1λ和终止位置2λ随所取周期数Ni（i=1,2）、折射率nj（j=1,2,3）和厚度a、b、c的变化规律,得出在小范围内可以近似认为它们均成线性变化和N1=N2=7为理论最优化周期数的结论。利用这些性质在一束波长范围在2 280~2 396 nm的混合光中,用折射率n1为1.378、厚度a为159 nm的氟化镁,折射率n2为2.356、厚度b为200 nm的硫化锌,以及折射率n3为4.100、厚度c为400 nm的碲化铅为光子晶体材料,通过调节参数变化,提取出了需要的波长为2 351 nm的光,滤波效果很好。
Constructing the one-dimensional three sects photonic crystal with symmetrical structure in the form of（AB）N1（BA）N2,the numerical calculation was done using the transfer matrix method of photonic crystal. It was found that in the transmission spectrum of this photonic crystal with symmetrical structure there were extremely narrow transmission peaks in the main prohibitive band,which had the similar results with the photonic crystal which had certain size of defective layers.The changing laws of the transmission peak position λ,the initial position λ1 and the stopped position λ2 of this kind of photonic crystal caused by the changes of the section quantities Ni（i=1,2）,the refractive rate nj（j=1,2,3） and the thickness a,b and c were analyzed.It came to the conclusion that they could be considered as the linear changing law approximately in a small range and N1=N2=7 was the optimization in theory.Based on these characteristics,through adjusting the changes of the parameters,the light of 2 351 nm that was needed was distilled in the mixing light with the range of 2 280～2 396 nm,in which the photonic crystal materials were selected as follows： The MgF2,with the refractive index n1=1.378 and the thickness a=159 nm,the ZnS,with the refractive index n2=2.356 and the thickness b=200 nm,and the PbTe,with the refractive index n3=4.100 and the thickness c=400 nm.The result of which was very well.
出处
《光电子技术》
CAS
2007年第3期145-151,共7页
Optoelectronic Technology
基金
国家自然科学基金资助项目(60377002)
关键词
光通信
滤波
传输矩阵
光子晶体
透射带
optical communication
filter
transfer matrix
photonic crystal
transmission gapstic
