Study on electro-optic properties of two-dimensional PLZT photonic crystal band structure

The band characteristics of two-dimensional(2D) lead lanthanum zirconate titanate(PLZT) photonic crystals are analyzed by finite element method.The electro-optic effect of PLZT can cause the refractive index change when it is imposed by the applied electric field,and the band structure of 2D photonic crystals based on PLZT varies accordingly.The effect of the applied electric field on the structural characteristics of the first and second band gaps in 2D PLZT photonic crystals is analyzed in detail.And the results show that for each band gap,the variations of start wavelength,cut-off wavelength and bandwidth are proportional to quadratic of the electric field.     

基于光弹效应的二维光子晶体能带结构特性研究

根据介质的光弹效应,采用有限元法对二维光子晶体的能带特性进行分析。当给二维光子晶体施加应力时,由于构成二维光子晶体的介质的光弹效应,引起介质的折射率变化,使得光子晶体的能带结构发生变化。详细分析了外加应力变化对基于Si/SiO2二维光子晶体能带结构特性的影响,结果表明,禁带的起始波长、截止波长及禁带宽度的变化量与外加应力呈线性关系。     

混合表面等离子体光子晶体波导

构建了一种金属-绝缘体-半导体混合表面等离子体结构,基于时域有限差分法验证了该结构在归一化频率0.243~0.271 (a/λ) 范围内具有明显的TM模式带隙。在二维光子晶体层移除或改变中间行空气孔半径构成线缺陷,形成混合波导结构1和2。分析表明,入射光频率位于带隙内的光子能量被很好的局域在低折射率层中,且只能沿线缺陷传输。当入射波长为1550nm时,两种波导的传输距离分别为18.41μm和15.70μm,群速度极值分别为0.186c和0.166c,品质因数FoM达到384.74和1042.50。此波导能通过光子晶体层的线缺陷控制低折射率层SPP的传输路径,为波导器件的研究提供了有效的理论基础和依据。