非线性一维光子晶体反射谱的多值特征研究  

Multiple-valued Characteristic Research of Nonlinear One-dimensional Photonic Crystal Reflection Spectrum

作　　者：张荣军[1] 张娟[1] 夏睿申 

机构地区：[1]上海大学通信与信息工程学院特种光纤与光接入网省部共建教育部重点实验室,上海200072

出　　处：《光子学报》2014年第9期170-175,共6页Acta Photonica Sinica

基　　金：国家自然科学基金(No.10804070);上海市重点学科(No.S30108)资助

摘　　要：以含有一层kerr非线性介质的一维光子晶体为对象，基于子层逆向递推算法，给出了非线性反射谱一种简单有效的数值计算方法．基于此方法得到了该结构在1535～l565nm范围内的非线性反射谱．当输入光强高于阈值时，缺陷模缓慢移动并出现弯曲倾斜的多值特征．分析了上跳波长、下跳波长随输入光强的变化趋势．研究了线性周期介质和非线性介质结构参数对反射谱的影响．研究表明：增加周期介质的周期、高低折射率比和非线性层厚度都能使缺陷模变窄，输入光强阈值和上跳波长、下跳波长的阈值波长降低；而非线性介质的三阶非线性系数增大时，输入光强阈值降低，但缺陷模宽度、上跳波长和下跳波长的阈值波长没有明显改变．这种多值特征对于设计光学开关、光学滤波器等有着重要的指导作用．Based on the sublayer division and backward recursion algorithm, a simple and efficient numerical method for calculating the nonlinear reflection spectrum of one-dimensional photonic crystal with one kerr nonlinear defect layer was presented. The nonlinear reflection spectrum in the wavelength range of 1 535 nm to I 565 nm was obtained by the method. When incident intensity is higher than the threshold,the defect mode moves slowly and appears inclined curved multiple-valued features at certain wavelengths. The influence of incident intensity on jump-up wavelength and jump-down wavelength was analyzed. The influence of parameters of periodic dielectric layer and nonlinear layer on reflection spectrum were investigated systematically. The results showed that the period, high-low refractive index ratio of periodic medium and the thickness of nonlinear defect layer is increased,the defect mode width is narrowed and the threshold of incident intensity,jump-on and jump-down wavelength is decreased. While when the third-order nonlinear coefficient is increased for nonlinear layer, the threshold of incident intensity is decreased and the defect mode width,jump-on and jump-down wavelength threshold is not changed obviously. The multiple-valued feature has an important role in the design of optical switch, optical filter,et al.

关 键 词：非线性 克尔介质 光学滤波器 反射谱 多值特征 阈值 

分 类 号：O437[机械工程—光学工程]