一维光子晶体中二次谐波产生的增强效应  

Enhancement of Second Harmonic Generation in the One-Dimentional Photonic Crystal

作　　者：张丽娟[1] 赵丽明[2] 

机构地区：[1]晋中学院信息技术与工程学院,山西晋中030600 [2]首都师范大学物理系,北京100048

出　　处：《中北大学学报（自然科学版）》2016年第5期535-540,共6页Journal of North University of China(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11004139);晋中学院教改项目(zl2013jg17)

摘　　要：通过对基频场及介质方向进行调制的方法研究了光子晶体中二次谐波产生转换效率的影响因素.该方法运用转移矩阵法计算得出二次谐波产生的转换效率,通过改变空气层厚度实现对基频场的调制,运用模拟退火的方法来实现对介质层方向的优化,然后通过场能量,基频波透射率和倍频波透射率随空气层厚度的变化规律,分析了一维光子晶体中影响二次谐波产生转换效率的因素.结果表明:传统的准相位匹配条件对一维光子晶体已不再适用;除了光子晶体的带边效应,基频场以及倍频场的分布同样对二次谐波产生有重大影响,当达到透射共振时,二次谐波转换效率会有很大提高;通过调制介质层的极化方向,二次谐波产生转换效率会大大提高.这些结论为非线性光子晶体中提高二次谐波产生转化效率提供理论指导.The influence factors of the second harmonic generation conversion efficiency in the photonic crystal was researched by modulating the distribution of fundamental wave field and the polarized direction of the medium.The second harmonic generation conversion efficiency was calculated by the transition matrix method.The modulating of fundamental wave field was achieved through changing the thickness of the air.The modulating of the polarized direction of the medium was achieved by the simulated annealing algorithm.The influence factors of the second harmonic generation conversion efficiency in the one-dimentional photonic crystal was analysed through the variation of energy,fundamental wave transmittance and second harmonic wave transmittance with the thickness of the air.It is found that the quasi-phase-mach is not suitable for the configuration of the one-dimentional photonic crystal;except the band edge effect of photonic crystal,the distribution of the fundamental wave and the second harmonic wave can also apparently enhance the second harmonic generation conversion efficiency;the conversion efficiency can be enhanced significantly when transmission resonance takes place;the polarized direction of the medium can influence the second harmonic generation conversion efficiency.These conclusions can provide the theoretical guide for enhancing the second harmonic generation conversion efficiency in nonlinear photonic crystal.

关 键 词：非线性光学 二次谐波转换效率 模拟退火算法 转移矩阵 一维光子晶体 

分 类 号：O437[机械工程—光学工程]