含缺陷态的非线性介质材料的光子晶体的双稳态特性

文章报道了在具有缺陷态的二维非线性介质材料的光子晶体中光的传播特征 ,光子晶体是含有多单元层的简单和复杂周期的介质结构。事实上 ,我们感兴趣的主要是缺陷模式的传播和局域的光强的增强因素。用转移矩阵方法 ,我们计算了光子晶体的电磁场波的传播 ;从而获得局域光的增强效应 ;这种方法计算了有限厚度材料的传播特性 ,数字结果表明非线性介质材料的缺陷结构的光传播能引起输入的光强度的改变 ;这种改变表现出双稳态特征 ;对于简单和复杂的光子晶体 ,假设输入的光强度是稳定的 ;这种双稳态特征就容易出现 ;对于复杂结构的光子晶体 ,则便显出复杂的特征。总的传输量是大的情况 ,双稳态也会出现。另外 ,缺陷介质的饱和吸收系数 ,折射率比值及介质层数值确定了双稳特性的可见性

Bistability of photonic crystals with defects of nonlinear dielectric materials

We report on the properties of light transmission in one-dimension photonic crystals with defects of nonlinear dielectric material,photonic crystals have simple and complex period dielectric structure with multi-unit layer.In particular,we are interested in the transmittance of defect mode and the intensity enhancement factor of localized light.By the transfer-matrix method,we can calculate the electromagnetic waves transmission through a photonic crystal,the intensity enhancement factor of localized light can be obtained.The method calculated the transmission properties normal incident on a finite thickness slab of material.The numerical calculation shows that the transmission with defect layer of nonlinear dielectric material can induced to bring about change by the input intensity of light,and the change of the transmission shows the bistability.For simple and complex period dielectric in PC,if the threshold of input intensity be satisfied,the properties should be emerged easier.For complex period dielectric in PC,the transmission can show the property of complex results.When the total transmission is big,the bistability is also displayed.In addition,the character is seen to determine by the saturation absorption coefficient of the defect medium,the refractive index ratio and the number of layers.