材料色散对渐变结构一维光子晶体带隙的影响  

Effect of Material Dispersion on Bandgap of One-dimensional Graded Photonic Crystals

作　　者：武继江[1] 

机构地区：[1]山东理工大学理学院,淄博255049

出　　处：《人工晶体学报》2011年第2期474-479,共6页Journal of Synthetic Crystals

基　　金：山东省自然科学基金(No.ZR2009GL015)资助项目

摘　　要：运用传输矩阵方法及对色散材料采用洛伦兹振子模型,研究了由色散材料构成的介质层厚度为渐变结构的一维光子晶体的带隙特性,并与不考虑材料色散时的光子带隙进行了比较。计算结果表明,考虑色散后的光子带隙既可能变窄也可能增宽,即可能发生红移也可能发生蓝移。光子带隙的改变与色散材料的色散强度和谐振频率及色散前后两介质材料折射率相关。此外,介质材料折射率的变化形式对光子带隙也存在一定的影响。这些为相关光子器件的设计提供了参考。By means of transfer matrix method,the bandgap properties of one-dimensional gradual periodic structure photonic crystal with dispersive material are discussed and compared with that with non-dispersive material.The dispersive material is described by a Lorentz oscillator model.The results indicated that the material dispersion will bring about both narrowness or enlargment for the photonic bandgap width and red shift or blue shift for the photonic bandgap central frequency.This change is related with the dispersive strength and resonance frequency of dispersive medium and the change of the refractive index of two matialreals.The refractive index variation profile of the dispersive material is also related with the change of the photonic bandgap.These offer a useful reference for the design of the related photonic devices.

关 键 词：带隙特性 传输矩阵法 光子晶体 渐变结构 材料色散 

分 类 号：O734[理学—晶体学]